As soon as they said Sendai, I thought of that horrible earthquake and tsunamis and I realised that the man's little workshop may not even be there now :(
Ceramic knives are super dangerous because they look harmless. They look like they are made out of plastic. A child could carry one around on Halloween and nobody would look twice at it.
ceramic knives are seriously sharp, so sharp that you can seriously cut yourself accidentally with little effort. So beware, they are sharper than razor blades.
And not be afraid with what she is going to do with it, when she gets that?? Please be reminded these knives are sharp as hell and can filet you without you knowing at first! :-D
Only in Japan..Nowhere else in the world can you find centuries old skills still being used like this..The fact that the master does each blade BY HAND is mind blowing.......
Omg...Sendai has the finest knifemakers in the world, but has gotten DEVASTATED by the earthquake and tsunami. I hope that they will recover from that terrible disaster
I wonder if there will be a knife that will never break bend chip or dull. And I mean never dull what so ever. And that can do all the jobs it might be needed for.
i believe aluminium oxide is the second line after diamond, not zircornia.... zircon lined 8 in mohs scale... the video its self miss guide the info telling people second after diamond...
@be292 No, hardest, not strongest; know the difference. In fact, ceramic cracks and breaks quite easily, it has very poor toughness and absolutely no ductility.
@RebelWrestler45 but this Ceramic and ur ordinary ceramic is different. the Ceramic used for Kyocera's knife is harder and stronger then steel.they dont break easily.it would be best if u listen more to the video ^^
@derekbegins No, kyocera's ceramic is harder, but not stronger. Strength is dictated by how much force the material can bear, before it breaks, and most steels are much stronger than ceramic, not to mention much tougher and ductile (ceramics have absolutely zero ductility). I own a few Boker ceramics, which are of higher quality than Kyocera, and I've already chipped two of them; including the point off of one of them when I dropped it on tile.
@RebelWrestler45 You're right. They're very sharp and will hold the edge for a long time but are not at all ductile or malleable. Generally, if you drop one it's done for.
@live4shine Wow you are dumb these are better than metal because they don't rust so we don't throw them away to get new ones. Stop posting about saving the planet because you are wasting more energy every time you do if you are that concerned.
@PyroDesu So what if a a micro-chip breaks off from the edge of the ceramic knife unnoticed, and it ends up in the salad which someone eats without noticing? What will happen to that persons digestive system as that super sharp tiny ceramic microchip travels through the body?
@PyroDesu So what if a a micro-chip breaks off from the edge of the ceramic knife unnoticed, and it ends up in the salad which someone eats without noticing? What will happen to that persons digestive system as that super sharp tiny ceramic microchip travels through the body?
@PyroDesu So what if a a micro-chip breaks off from the edge of the ceramic knife unnoticed, and it ends up in the salad which someone eats without noticing? What will happen to that persons digestive system as that super sharp tiny ceramic microchip travels through the body?
@PyroDesu But doesn't all the refining and construction equipment use as much energy (and coal-generated electricity) as steel? As well as shipping costs around the world...
@Naturepheonix because hardness is different than strength, like say how diamond are the hardest thing on earth but can be shattered by a hammer, and spider webs are apparently the strongest thing on earth, but are very soft
@Naturepheonix because like all ceramics they are extremely rigid meaning their is absolutly no bend to the material whatsoever, kind of like a coffee mug or plate glass.
so why do they use zirconia rather than alumina? alumina is harder, stronger, and lighter than zirconia, and although zirconia is tougher, its not going to have a high tensile load anyway
Well, you're right AND wrong about that. While carbon is one of the more plentiful elements in the Earth's crust, very rarely is it i found in the structure of a diamond. Usually, it is found as coal. Diamonds only form extremely deep in kimberlite, a rock found in dead volcanic shafts.
Diamonds are plentiful and probably would be much less expensive were it not for the global cartel run since 1934 by De Beers, which controls 70 percent of the rough (unpolished) diamond market. Because diamonds are durable, the demand for diamonds depends on consumers' expectations about future prices. De Beers has tried to convince consumers that diamond prices will never fall and has often stockpiled diamonds, rather than sell them, in order to prevent prices from falling.
although the US military does use great gear, price of production and time has a lot to do with what we use. If something is very expensive to make or takes a lot of time we usually don't use it.
may be cost.. even i've heard that ceramic is very versatile in metallurgy... they started using ceramic as ballbearing coz it does not take heat.. so, they are robust... but i think it is costly to produce.
this ceramic desirable for these chefs and other people:
* harder than steel
* never rusts
* never stains (no microbes, more hygienic than metal)
* almost impossible to blunt (due to it's hardness)
* lighter (easier to wield)
ceramics are used in different applications, heat resistance being a common quality of most ceramics, you can find them in space shuttle heat-shields to high-end brake pads in F1 cars and expensive production cars like Porsche.
yeah you can thats why people dont use ceramic knives they may never need sharpening but if you drop it on the floor chances are it will break like a normal ceramic plate.
As awesome as this is, I can't help but imagine a katana being made out of this stuff.
Super sharp, relatively low price [ lower than a typical katana, anyway ] and extremely light.
If what they say about its hardness - being second to diamonds - is true, than it'd definitely be an amazing weapon, and something I'd say "oh snap, don't mess with that guy" to - that is if I'm not the one with the sword.
in copper rod casting, we used zirconium oxide guide rollers in our finishing mill. they heat up to about 1,700F and rarely fail. but when they do fail...complete destruction.
i've lived in japan for 12 years, and never seen a sushi chef use a ceramic knife. they mostly use laminated carbon steel blades, or sometimes stainless. sushi knives should be able to be sharped easily to a very keen edge; how would a ceramic blade allow for that? it has to be sent somewhere for re-sharpening.
@happymerc actually, this is very incorrect. japanese carbon blades are harder then most western knives (often highly alloyed stainless), take a super keen edge, yet are very easy to sharpen. hardness, keen edge, edge retention and wear-resistance are not interchangeable terms. it might be counter-intuitive, but a fact nevertheless. for example, some very hard, wear-resistant tool steels don't hold an edge worth a damn.
@kalevraa well i am just saying your statement is kind of contradicting alone. a wear resistant tool that wears easy is basically what your last sentence said. stainless is a weaker metal in my book, people just use it because it doesn't rust.
@happymerc well, wear-resistance and keeping a good edge are not one and the same. the contradiction is only an apparent, not a factual one. the mechanism of resisting wear on a large surface, such a a die face, is quite different for a knife edge. it sounds self-contradicting, but has to do with the crystalline structure of steels and carbide sizes. "wear-resistant" doesn't automatically mean "long lasting edge". "hard" doesn't always mean "hard to sharpen". it is a bit counter-intuitive.
@happymerc as for stainless -- there is a huge variety. 440c is crap, for instance, no matter what you do to it. japanese ginsu stainless will hold a great edge, as will some swedish steels. don't know what you mean by "weaker" metal. hardness, toughness, ease of sharpening, edge-retention and wear-resistance are all different and often opposing qualities. it might offend one's common sense that wear-resistant steel blade might blunt faster than a plain carbon edge, but it's just the way it is.
The steels I'm talking about in the competition cutting knives is usually CPM M4 made by Crucible Specialty Metals. The ceramic used for these knives is presumably a proprietary blend of Zirconia and Alumina. Given these specifics, I maintain that the steel blade is tougher, can tolerate lower edge angles, get sharper, and cut better than ceramic. The ceramic is better in wear, corrosion, and heat resistance. If dulling occurs by chipping due to low toughness, M4 will hold an edge longer.
The term "ceramic" is about as specific to describe the composition of the material as saying something is made of "metal." What kind of metal? What kind of ceramic? There are so many types of ceramic, each formulated for particular characteristics, that it is incorrect to take one embodiment and assume its characteristics apply to another. These knives are made of a very unusual composition that give them superior hardness with essentially zero porosity.
OK, it seems I'm getting terms confused. You are talking edge thickness in terms of say, edge width, the microscopic width of the actual cutting edge. I was thinking of thickness of supporting steel, edge angle, thickness behind the edge bevel, etc. I've seen micrographs of steel with an edge width 250-300 nanometers wide, with no teeth and a few fine abrasive marks on the sides, at 3000x mag. How thin can the ceramic go? I'm sure Kyocera has pics, but I bet they wont share.
you obviously know a bit about steel cutlery but as far as ceramics go you seem to be speculating quite a bit. how about instead of writing half a novel in the comment section asking if ceramics can stand up to the tests you've seen with steel, you actually research and find out. that way you can clearly and concisely state fact instead of clogging this piece up with conjecture.
When did observations based on ceramic knives I've seen and handled become conjecture? Here are the facts. Steel toughness is about 10 times higher than this ceramic, minimum. Steels can handle thinner edges for rougher work. Ceramics are much more wear resistant. Ceramics are immune to kitchen corrosion. This ceramic has much lower tensile strength. The edge will crack easier than steel. To make up for this, ceramics use more obtuse geometry. I dont know the limit of ceramic sharpness
I've seen competition cutting knives of steel with edges of 11 degrees total cut 2x4's and wood dowels and still be sharp enough to split a drinking straw down the center. Of course, these are much more expensive than the Kyocera knives. Basically, I havent seen anything to indicate that ceramic has an advantage over steel in anything but edge-holding and rust resistance. Steel equals or exceeds ceramic in sharpness and cutting ability and exceeds it in toughness.
Steel is (6.3) on MOLS SCALE "CERAMIC Such as (AL203,B4C,SIC) is rated (9.5) on MOHS SCALE OF HARDNESS DIAMOND is RATED 10.0 basically the hardest on the scale
"you can drop it abuse it with massive punshiment and still have its shape"
Now this type of ceramic is used too make Small arms protective inserts or a Panel like SAPI is also known as SOV or "DRAGONSKIN"
know you know the ceramic is "LIGHT AND STRONGER" then steel
Jester PSD, BLACKWATER USA W.W. PRIVATE SECURITY CONTRACTOR.
sorry SAPI is a PLATE and SOV is a panle like overlapping disk that murray neal invented in 1997 and conducted it in 07 for US TROOPS but failed more like PSD's got there hands on it and awell as the CIA and some Speical operation units.
We are talking about using ceramics for knives. For those armor applications, the ceramic used probably is superior to steel, but that is a different ceramic than that used in these knives. The Mohs scale is hardly a measure of toughness. It is only really applicable if you want to know what material will scratch another. Oh, and I forgot, they are superior in heat resistance as well, though that is rarely an issue for kitchen knives.
yes, but it also doesn't transfer the flavor of one piece of food to another, all it needs is a light rinse and it's good to cut again, even stainless steel knives have tiny holes in the blade, causing transfer of food and possibly unwanted flavors or even bacteria to another dish, ceramic is superior to steel in every way possible, considering kitchen knives.
also the edge is thinner, allowing for more precise and cleaner cuts.
The flavor transfer is part of the corrosion resistance, which admittedly ceramics are much better at w/r to kitchen duty. Stainless steel does not have holes in it, nor pores or anything of that sort. Of the 2 things we are discussing, ceramics are much more likely to have a porous structure. I dont know if these knives do, its not discussed in the video. Some steel kitchen knives have edge angles of 10 degrees total. Can anyone measure a ceramic knife to find out the geometry of one?
it's not the edge angle I'm talking about, it's the edge itself, in a steel knife, the edge when looked close enough looks a lot like a saw, the edge on a ceramic blade is smooth and free from teeth, this is what makes them perfect at keeping food from transferring to another, the surface of a steel blade naturally has miniscule holes throughout the surface because of how the steel was made and manufactured, in a ceramic knife, the grains of zircon are so small that they leave a clean surface.
No conventionally processed steel has these holes in it you're talking about. If you have seen them, do you have a size? None of the micrographs I've ever seen show any holes in steels, even up to 3000x mag. Also, the teeth sometimes seen on steel blades can be polished away easier than the ones on ceramic blades. Steels are tough enough that these teeth will actually work on a steel blade, where on a ceramic blade they will break off, leaving a dull edge.
Virtually unbreakable and tougher than steel? Hardly. Tougher than other common ceramics, yes. These are not amorphous like obsidian or glass and I doubt they can be honed as sharp as a steel knife, though they certainly seem to do the job on sushi, and as long as they cut only wood cutting boards and fish, they should stay sharp for years, maybe for 10 to 20 with great care against hitting anything hard that could chip the blade.
It's actually quite a bit sharper than anything steel can hold. Because of its hardness, you can create a much thinner edge to it, which is what makes things sharp. The reason steel is used is because it's more flexible. If you hit this stuff, it'd break, where as steel would bend.
Do you have any comparison testing of side by side kyocera and steel knives? Any CATRA testing? That may not be fair, since I think CATRA is a western organization and Japan may not have an equivalent. Can you whittle a hair held between your fingers with a Kyocera ceramic blade? They are tougher than they look, but I doubt the brittleness would allow them to hold as thin an edge as steel without chipping. Many cutlery steels are hard enough they wont bend, but break as well.
If you have a fine enough abrasive, there's really no reason the ceramic knives wouldn't be able to hold an edge, assuming you don't go pounding it around against hard surfaces. But anyone that would do that with a good knife has no business owning a good knife anyways.
The hardness would be a benefit to hold an edge because it wont bend like steel would. Just need an extremely gentle sharpener to avoid chipping.
No arguement there. The ceramics will hold an edge much longer than the steel blades will. My contention is that steel can take and hold a much thinner edge before it starts to chip. I've seen knives with edges of 8 degrees, total, not on one side. I dont think that ceramics could take that and not chip from moderate contact with the cutting board. The same grit abrasives would work just as well or better on steel.
your thinking of a Weak ceramic if you look into Ballistic plates like the ESAPI plate the "Department of Defence" issues there personal is made out of Boron Carbine (B4C) it can stop rounds known too man of the largest threats too personal ground troops
@trodat07 I'd wish. But ceramic blades can't be longer than ten inches or so: the material is incredibly hard, but incredibly brittle. The blade shatters if it's too long, or if you put too much pressure on the blade. But they're perfect for precision slicing.
@trodat07 I was thinking about that myself. Maybe a replaceable ceramic edge could work, but i'd imagine that would require near-constant replacement, due to chipping and such.
How Ceramic Knifes are made in Europe!
JensLucht 2 weeks ago
Comment removed
v0idwareprohibited 1 month ago
Ceramic katana anyone?
Psychoticalchoholic 2 months ago
@Psychoticalchoholic The blade is ceramic so one hard knock will shatter the blade.
mentalone1995 1 month ago
As soon as they said Sendai, I thought of that horrible earthquake and tsunamis and I realised that the man's little workshop may not even be there now :(
thesilversakura 2 months ago
Ceramic knives are super dangerous because they look harmless. They look like they are made out of plastic. A child could carry one around on Halloween and nobody would look twice at it.
Stainless steel automatically commands respect.
3nasacova 3 months ago
@brungasto Well high grade steel knives crack and shatter too...and you really shouldn't need a "tough" knife if you know what you're doing.
kintarben 4 months ago
Works by hand to sharpen the knives? hehe!! The perfect knife NEEDS ...a laser 3D feedback controlled, full immersion cooled, robot.
doceigen 4 months ago
"Anyone squeamish should now look away"
"Pshh, he'll cut his fingertip, I can handle this"
*CUT*
NOPE NOPE NOPE NOPE NOPE
theyos88 5 months ago 4
ceramic knives are seriously sharp, so sharp that you can seriously cut yourself accidentally with little effort. So beware, they are sharper than razor blades.
AmericanEuro1 5 months ago
wait Kyocera makes knives ? I thought they just make phones ?
SR228 6 months ago
@SR228 mitsubishi make pens
andremitsuo 4 months ago
Asians! all they do is better that the rest of the world! what would we do without them??
you got to love these knives
snowdjagha 7 months ago
bad joke at the end >.>
spartan1004 7 months ago
And not be afraid with what she is going to do with it, when she gets that?? Please be reminded these knives are sharp as hell and can filet you without you knowing at first! :-D
gyqz 7 months ago
@gus23a Oh...That is what every woman wants....a ceramic knife...hahahahahahahahahahaha.
gyqz 7 months ago
@gyqz
right! instead of a little tiny crystal on a ring, you can buy her a whole knive!
gus23a 7 months ago
did he just say chepan?
Agamerfr0zed 8 months ago
I was on a different tab, and when he said "Meet...the Master", I went a little crazy looking for John Simm...
Nerd jokes! Nerd jokes!
LifeMustard 8 months ago
Only in Japan..Nowhere else in the world can you find centuries old skills still being used like this..The fact that the master does each blade BY HAND is mind blowing.......
Tnythebasic 9 months ago
@Tnythebasic A machine should copy the precision of a master and there will be no need for humans! muahahahahhahaa >:3
cyber8000 7 months ago
oh shit this whole plant must be gone now. I hope the master and his assistants are ok.
KinetikPlayground 9 months ago
I want a ceramic sword
coenpat 9 months ago
@coenpat That would be a bad idea. It is too brittle.
MisterDrumngun 9 months ago
The Master wil only ever produce 2 perfect knives because he only has 2 thumbs.
MrTimmeh85 10 months ago 7
I wonder if they have considered making shaving razors?
smartguy104 10 months ago 4
The end of the earth. I live in Perth:|
hastalavistababy45 10 months ago 68
@hastalavistababy45 If it makes you feel better, Perth is the first place I ever traveled to.
aluisious 7 months ago
@hastalavistababy45 poker face :|
faiz461 7 months ago
@hastalavistababy45 BAHAHAHHA you redneck
ottomobille 6 months ago
@ottomobille redneck, what? Perth's a city.
Jesusability 6 months ago
@Jesusability tbh i dont even remember why i said that
ottomobille 6 months ago
@ottomobille it's okay friend, we all make mistakes
Jesusability 6 months ago
This has been flagged as spam show
@hastalavistababy45 Don't you mean "|:ɥʇɹǝd uı ǝʌıן ı ˙ɥʇɹɐǝ ǝɥʇ ɟo puǝ ǝɥʇ"?
loldotalol379 4 months ago
@hastalavistababy45 beat you, I live in Kalgoorlie HAHA!
DarkLordVincent 2 months ago
@hastalavistababy45 all in the eye of the beholder......you can say: Perth te beginning of the earth....
basmikiemike 1 month ago
Omg...Sendai has the finest knifemakers in the world, but has gotten DEVASTATED by the earthquake and tsunami. I hope that they will recover from that terrible disaster
starscreamthe7th 10 months ago 33
@starscreamthe7th I know it sounds terrible to say, but can you imagine being anywhere near a knife factory in a tsunami?
aluisious 7 months ago
@starscreamthe7th No it everything is fucked the world is going to end! every1 run to mars!
cyber8000 7 months ago
Oh god, Sendai was the closest city to the quake... all those Japanese are dead or wounded :(
ataraxic89 10 months ago
Thanks for posting this vid!!! I love ceramic knives!!!
BrotherIan 11 months ago
I wonder if there will be a knife that will never break bend chip or dull. And I mean never dull what so ever. And that can do all the jobs it might be needed for.
lerenceo 11 months ago
Australia ^-^ I live in Sydney!
DIMATIF 1 year ago
Thumbs up if you are reading the comments in a British accent after watching that video.
charmedlover88 1 year ago 2
@charmedlover88 thumbs down my anus is brown
MSfreaker 1 year ago
thanks this was of really good use for my school assignment!
yannick1024 1 year ago
i believe aluminium oxide is the second line after diamond, not zircornia.... zircon lined 8 in mohs scale... the video its self miss guide the info telling people second after diamond...
molceonly 1 year ago
Enlightening & witty documentary. Thank you for publishing it here.
flyby2300 1 year ago
Cermaic knives are brittle as hell. Sharp as hell. but don't bang it on the sink or you'll get a nice razor sharpened shard of ceramic.
jimmy202500 1 year ago
What sushi place is that? I wanna eat there
starscreamthe7th 1 year ago
You can buy them at : Chef Depot . c o m (copy and put together)
chefgiovanni 1 year ago
now my sword's white in colour hahahahahahaahahahahahahaha!
yihanglee 1 year ago
those are so sharp and amazing, but i would worry about them cracking.
busyhands94 1 year ago
@busyhands94 they wont crack or break, they are the next strongest thing to diamond.
be292 1 year ago
@be292 No, hardest, not strongest; know the difference. In fact, ceramic cracks and breaks quite easily, it has very poor toughness and absolutely no ductility.
RebelWrestler45 1 year ago
@RebelWrestler45 but this Ceramic and ur ordinary ceramic is different. the Ceramic used for Kyocera's knife is harder and stronger then steel.they dont break easily.it would be best if u listen more to the video ^^
derekbegins 1 year ago
@derekbegins No, kyocera's ceramic is harder, but not stronger. Strength is dictated by how much force the material can bear, before it breaks, and most steels are much stronger than ceramic, not to mention much tougher and ductile (ceramics have absolutely zero ductility). I own a few Boker ceramics, which are of higher quality than Kyocera, and I've already chipped two of them; including the point off of one of them when I dropped it on tile.
RebelWrestler45 1 year ago
@RebelWrestler45 You're right. They're very sharp and will hold the edge for a long time but are not at all ductile or malleable. Generally, if you drop one it's done for.
DrMotorDude 1 year ago
@RebelWrestler45 Oh i did not know that. thanks for the info I'll have to keep that in mind when I eventually get one
be292 1 year ago
You've gotta admire the Japanese for their contributions to The Table of Life; their smarts and ingenuity benefit the rest of us immensely.
guyNbluejeans 1 year ago
I got one of these for Christmas and within 3 days it was chipped then broken. I was not using the knife very hard either. I do not recomend.
nealss13 1 year ago
@nealss13 you probably used it on a wrong surface.. or else someone bought you something really cheap!
vikingvic 1 year ago
@nealss13 They are only supposed to be used on wooden or plastic cutting boards. You use ceramic or stone surfaces...the knife can chip.
StaticJolts 1 year ago
@nealss13 was it made by Kyocera?
KODAKGUYNUMBER1 1 year ago
a pity you cant make a viable sword from ceramic
chashiro 1 year ago
a pity you cant make a viable sword from ceramic
chashiro 1 year ago
What show is this from?
sheupe 1 year ago
warning don't take these through customs the detectors will find them and they make you sit in a room for 24 hours with the handle up ur ass
astroblaster56 1 year ago
Well there you go, we are destroying the planet that we live on!Isn't this ironic??and stupid..
live4shine 1 year ago
@live4shine Wow you are dumb these are better than metal because they don't rust so we don't throw them away to get new ones. Stop posting about saving the planet because you are wasting more energy every time you do if you are that concerned.
IVIonkey123 1 year ago
i can haz one?
frunlakiso2 1 year ago
THEY ARE DESTROYING OUR PLANET LITTLE BY LITTLE , FOR WHAT???
live4shine 1 year ago
@live4shine using steel destroys the planet even more.
PyroDesu 1 year ago
This has been flagged as spam show
@PyroDesu So what if a a micro-chip breaks off from the edge of the ceramic knife unnoticed, and it ends up in the salad which someone eats without noticing? What will happen to that persons digestive system as that super sharp tiny ceramic microchip travels through the body?
5T34LTHcamoT4NK 1 year ago
This has been flagged as spam show
@PyroDesu So what if a a micro-chip breaks off from the edge of the ceramic knife unnoticed, and it ends up in the salad which someone eats without noticing? What will happen to that persons digestive system as that super sharp tiny ceramic microchip travels through the body?
5T34LTHcamoT4NK 1 year ago
This has been flagged as spam show
@PyroDesu So what if a a micro-chip breaks off from the edge of the ceramic knife unnoticed, and it ends up in the salad which someone eats without noticing? What will happen to that persons digestive system as that super sharp tiny ceramic microchip travels through the body?
5T34LTHcamoT4NK 1 year ago
@PyroDesu But doesn't all the refining and construction equipment use as much energy (and coal-generated electricity) as steel? As well as shipping costs around the world...
BrotherIan 11 months ago
terrorists favorite weapon right? Jokes, This would be awesome if they made a sword like this.
elvensbane 1 year ago
thats a sushi not a teriyaki lol the author need to study more about japan.
derekbegins 1 year ago
ouch =. almost fainted when i saw him trying it on his nails.
derekbegins 1 year ago
try making a ceramic sword :D
or arrow tips!
Naturepheonix 1 year ago
@Naturepheonix they would shatter
HGClark 1 year ago
@HGClark and why so if they are harder then all alloys?
Naturepheonix 1 year ago
@Naturepheonix because hardness is different than strength, like say how diamond are the hardest thing on earth but can be shattered by a hammer, and spider webs are apparently the strongest thing on earth, but are very soft
HGClark 1 year ago
@HGClark Oh......
Naturepheonix 1 year ago
@Naturepheonix because like all ceramics they are extremely rigid meaning their is absolutly no bend to the material whatsoever, kind of like a coffee mug or plate glass.
Tbowers129 1 year ago
@Tbowers129 Oh!......
Thanks :D
Naturepheonix 1 year ago
as blunt as a bar of soap
hahaha WHAT
Gannondalf 1 year ago
so why do they use zirconia rather than alumina? alumina is harder, stronger, and lighter than zirconia, and although zirconia is tougher, its not going to have a high tensile load anyway
fartx211 1 year ago
i want a ceramic sword!
Brookskyar 1 year ago
ME WANTS SUSHI NOW!!!!!!
starscreamthe7th 1 year ago
Strip mining is bad.
Also - what the fuck was that classless joke at the end.
idoruZe 1 year ago
very nice video..i enjoyed watching this..
neilbalanay 1 year ago
AUSSIE AUSSIE AUSSIE!
sladeoss 1 year ago
@sladeoss OI OI OI!
PyroDesu 1 year ago
i need me some of these! it doesnt rust stain and retains an edg,e a knife could only b more perfect if it sharpened itself!
lukassnakeman 1 year ago
I have one of those at my house it is soooo sharp!
danocide 1 year ago
they seem to have mistaken "toughness" with "strength" in this video. you can easily crack zirconia, but not steel
fartx211 1 year ago
whats wrong with testing the knife on your self? i do it all the time with the back of hand, just so i know i have the right edge.
SleepingWolf26 1 year ago
what are you, emo?
PyroDesu 1 year ago
@PyroDesu
I said the back of my hand not wrist's dumbass.
SleepingWolf26 1 year ago
my bar of soap is pretty damn sharp though
xNightwraith 1 year ago
Funny enough, I used to have a kyocera hard drive in my 386 pc (forever ago)... my question is; will they flex like metal knives do.
CypherVirus 1 year ago
ever heard of ceramic armor?
emo4elmo 1 year ago
I have one of thies in black from Kyocera its very nice, its like the Rolls Royce version of knifes you can have in your kitchen.
brunitt0 1 year ago
Very cool knife. im gunna get one for my brother, he's a chef.
"just like diamonds you have to travel to the ends of the earth."
Diamond are one of the most plentiful rocks on the planet.
Fail of an analogy.
The4LA2Baker0 1 year ago
agreed on the diamonds comment, they're as plentiful as any other common minerals,rocks, etc
but "De Beers" would like you to believe they're really hard to find and worth lots of money for their "rarity"
p3ngwin 1 year ago
Well, you're right AND wrong about that. While carbon is one of the more plentiful elements in the Earth's crust, very rarely is it i found in the structure of a diamond. Usually, it is found as coal. Diamonds only form extremely deep in kimberlite, a rock found in dead volcanic shafts.
PyroDesu 1 year ago
PyroDesu
Wrong.
Diamonds are plentiful and probably would be much less expensive were it not for the global cartel run since 1934 by De Beers, which controls 70 percent of the rough (unpolished) diamond market. Because diamonds are durable, the demand for diamonds depends on consumers' expectations about future prices. De Beers has tried to convince consumers that diamond prices will never fall and has often stockpiled diamonds, rather than sell them, in order to prevent prices from falling.
The4LA2Baker0 1 year ago
@PyroDesu Where did you get that carbon is rarely found in diamonds? Carbon is what diamonds are made of.
EmperorofCartoons 1 year ago
@EmperorofCartoons I said that the carbon is rarely in the form of a diamond, k?
PyroDesu 1 year ago
@PyroDesu diamonds are made from carbom......
AppleAssassin 1 year ago
@AppleAssassin I meant that the carbon atoms are rarely arranged in the structure of a diamond, and I did not mean anything else!
PyroDesu 1 year ago
@AppleAssassin they are not made from they are carbon themselves arranged in a tetrahedral order
bugsbunny231 1 year ago
so i can make a ceramic bong chuck it across the room and it wont break.. i wont fuckn do it but im just sayn..
1234crack4321 1 year ago
just the opposite, ceramic is extremely hard, it's also extremely brittle. These knives MUST be handled with care or they'll shatter.
scottsworth36 1 year ago
If this material is so incredible, why isn't it seeing military application?
I suspect they're brittle. Part of what makes a knife is its ability to bend.
stealthbeast 1 year ago
although the US military does use great gear, price of production and time has a lot to do with what we use. If something is very expensive to make or takes a lot of time we usually don't use it.
Bobobaju 1 year ago
Looking around at ceramic folders, they don't seem to be unreasonably priced at all (30-60 dollars)
stealthbeast 1 year ago
they are probably too expensive for the military to use when a stainless steel knife works just as effectivley for stabbing someone in the face
fubar66 1 year ago
They're not expensive at all. High-end ceramic knives are about in the same price range for mid-end steel knives (50-70 dollars)
stealthbeast 1 year ago
may be cost.. even i've heard that ceramic is very versatile in metallurgy... they started using ceramic as ballbearing coz it does not take heat.. so, they are robust... but i think it is costly to produce.
MrUnemployedYouth 1 year ago
As far as I can tell, high-end ceramic knives cost about the same as mid-end steel knives.
stealthbeast 1 year ago
@stealthbeast do you know where can i get one of these
arni291 1 year ago
did you watch the video?
this ceramic desirable for these chefs and other people:
* harder than steel
* never rusts
* never stains (no microbes, more hygienic than metal)
* almost impossible to blunt (due to it's hardness)
* lighter (easier to wield)
ceramics are used in different applications, heat resistance being a common quality of most ceramics, you can find them in space shuttle heat-shields to high-end brake pads in F1 cars and expensive production cars like Porsche.
p3ngwin 1 year ago
This comment has received too many negative votes show
Great, another mineral we can use as an excuse to rape the Earth.
shutemdwn 1 year ago
God I love Stumble Upon
dmac187 1 year ago 18
i love how in japan there is always a a handcrafted element to everything...that ensures quality.
ultimatemeepo 1 year ago
I wish they made those in bushcraft style blades
combatcommand 1 year ago
Kyocera....THE PHONE MANUFACTUER???? makes these???
G0neguy 1 year ago
Second only to diamond in terms of hardness? I doubt that you can shatter the thing by just dropping it.
romainechester 1 year ago
yeah you can thats why people dont use ceramic knives they may never need sharpening but if you drop it on the floor chances are it will break like a normal ceramic plate.
randomjoe333333 1 year ago
i can see why they are so expensive
if i ever buy one which i will from japan i know im getting high quality never dulling, never rusting knives.
im paying for the best here
not like the sh*ty ass knives that cant even cut a tomato correctly like the one i used 3 days ago.
the stain just wont come out!!!!
im an idiot for waring my white sweater that day!!!!
sacura605 2 years ago
oh this made me hungry!
ciccarello 2 years ago
As awesome as this is, I can't help but imagine a katana being made out of this stuff.
Super sharp, relatively low price [ lower than a typical katana, anyway ] and extremely light.
If what they say about its hardness - being second to diamonds - is true, than it'd definitely be an amazing weapon, and something I'd say "oh snap, don't mess with that guy" to - that is if I'm not the one with the sword.
ekoukano 2 years ago
cermaic breaks when you drop it on the floor.
snipermgmn 2 years ago
thats the kind of ceramic they use in stuff like plates. this stuff is a hell of a lot more tougher.
PyroDesu 2 years ago
but it would shatter in the blink of an eye
HGClark 2 years ago
but it would shatter in the blink of an eye
HGClark 2 years ago
in copper rod casting, we used zirconium oxide guide rollers in our finishing mill. they heat up to about 1,700F and rarely fail. but when they do fail...complete destruction.
KinetikPlayground 2 years ago
i've lived in japan for 12 years, and never seen a sushi chef use a ceramic knife. they mostly use laminated carbon steel blades, or sometimes stainless. sushi knives should be able to be sharped easily to a very keen edge; how would a ceramic blade allow for that? it has to be sent somewhere for re-sharpening.
kalevraa 2 years ago
@kalevraa a knife that has the ability to be sharpened easily means it has no ability to hold an edge
happymerc 2 years ago
@happymerc actually, this is very incorrect. japanese carbon blades are harder then most western knives (often highly alloyed stainless), take a super keen edge, yet are very easy to sharpen. hardness, keen edge, edge retention and wear-resistance are not interchangeable terms. it might be counter-intuitive, but a fact nevertheless. for example, some very hard, wear-resistant tool steels don't hold an edge worth a damn.
kalevraa 2 years ago
@kalevraa well i am just saying your statement is kind of contradicting alone. a wear resistant tool that wears easy is basically what your last sentence said. stainless is a weaker metal in my book, people just use it because it doesn't rust.
happymerc 2 years ago
@happymerc well, wear-resistance and keeping a good edge are not one and the same. the contradiction is only an apparent, not a factual one. the mechanism of resisting wear on a large surface, such a a die face, is quite different for a knife edge. it sounds self-contradicting, but has to do with the crystalline structure of steels and carbide sizes. "wear-resistant" doesn't automatically mean "long lasting edge". "hard" doesn't always mean "hard to sharpen". it is a bit counter-intuitive.
kalevraa 2 years ago
@happymerc as for stainless -- there is a huge variety. 440c is crap, for instance, no matter what you do to it. japanese ginsu stainless will hold a great edge, as will some swedish steels. don't know what you mean by "weaker" metal. hardness, toughness, ease of sharpening, edge-retention and wear-resistance are all different and often opposing qualities. it might offend one's common sense that wear-resistant steel blade might blunt faster than a plain carbon edge, but it's just the way it is.
kalevraa 2 years ago
This is from a show called "How do the do it" on discovery channel............
Brue2 2 years ago
The steels I'm talking about in the competition cutting knives is usually CPM M4 made by Crucible Specialty Metals. The ceramic used for these knives is presumably a proprietary blend of Zirconia and Alumina. Given these specifics, I maintain that the steel blade is tougher, can tolerate lower edge angles, get sharper, and cut better than ceramic. The ceramic is better in wear, corrosion, and heat resistance. If dulling occurs by chipping due to low toughness, M4 will hold an edge longer.
wolpack1116 2 years ago
The term "ceramic" is about as specific to describe the composition of the material as saying something is made of "metal." What kind of metal? What kind of ceramic? There are so many types of ceramic, each formulated for particular characteristics, that it is incorrect to take one embodiment and assume its characteristics apply to another. These knives are made of a very unusual composition that give them superior hardness with essentially zero porosity.
petertwang 2 years ago
OK, it seems I'm getting terms confused. You are talking edge thickness in terms of say, edge width, the microscopic width of the actual cutting edge. I was thinking of thickness of supporting steel, edge angle, thickness behind the edge bevel, etc. I've seen micrographs of steel with an edge width 250-300 nanometers wide, with no teeth and a few fine abrasive marks on the sides, at 3000x mag. How thin can the ceramic go? I'm sure Kyocera has pics, but I bet they wont share.
wolpack1116 2 years ago
you obviously know a bit about steel cutlery but as far as ceramics go you seem to be speculating quite a bit. how about instead of writing half a novel in the comment section asking if ceramics can stand up to the tests you've seen with steel, you actually research and find out. that way you can clearly and concisely state fact instead of clogging this piece up with conjecture.
sargepup 2 years ago
When did observations based on ceramic knives I've seen and handled become conjecture? Here are the facts. Steel toughness is about 10 times higher than this ceramic, minimum. Steels can handle thinner edges for rougher work. Ceramics are much more wear resistant. Ceramics are immune to kitchen corrosion. This ceramic has much lower tensile strength. The edge will crack easier than steel. To make up for this, ceramics use more obtuse geometry. I dont know the limit of ceramic sharpness
wolpack1116 2 years ago
I've seen competition cutting knives of steel with edges of 11 degrees total cut 2x4's and wood dowels and still be sharp enough to split a drinking straw down the center. Of course, these are much more expensive than the Kyocera knives. Basically, I havent seen anything to indicate that ceramic has an advantage over steel in anything but edge-holding and rust resistance. Steel equals or exceeds ceramic in sharpness and cutting ability and exceeds it in toughness.
wolpack1116 2 years ago
for now >.>
agile52 2 years ago
Steel is (6.3) on MOLS SCALE "CERAMIC Such as (AL203,B4C,SIC) is rated (9.5) on MOHS SCALE OF HARDNESS DIAMOND is RATED 10.0 basically the hardest on the scale
"you can drop it abuse it with massive punshiment and still have its shape"
Now this type of ceramic is used too make Small arms protective inserts or a Panel like SAPI is also known as SOV or "DRAGONSKIN"
know you know the ceramic is "LIGHT AND STRONGER" then steel
Jester PSD, BLACKWATER USA W.W. PRIVATE SECURITY CONTRACTOR.
TerroristLarryPhillp 2 years ago
sorry SAPI is a PLATE and SOV is a panle like overlapping disk that murray neal invented in 1997 and conducted it in 07 for US TROOPS but failed more like PSD's got there hands on it and awell as the CIA and some Speical operation units.
TerroristLarryPhillp 2 years ago
They wouldn't be using them if they weren't superior to steels, smart guy.
transdrole 2 years ago
They are superior to steel, in corrosion resistance and edge holding, like I said below.
wolpack1116 2 years ago 2
We are talking about using ceramics for knives. For those armor applications, the ceramic used probably is superior to steel, but that is a different ceramic than that used in these knives. The Mohs scale is hardly a measure of toughness. It is only really applicable if you want to know what material will scratch another. Oh, and I forgot, they are superior in heat resistance as well, though that is rarely an issue for kitchen knives.
wolpack1116 2 years ago
yes, but it also doesn't transfer the flavor of one piece of food to another, all it needs is a light rinse and it's good to cut again, even stainless steel knives have tiny holes in the blade, causing transfer of food and possibly unwanted flavors or even bacteria to another dish, ceramic is superior to steel in every way possible, considering kitchen knives.
also the edge is thinner, allowing for more precise and cleaner cuts.
flamedrag18 2 years ago
The flavor transfer is part of the corrosion resistance, which admittedly ceramics are much better at w/r to kitchen duty. Stainless steel does not have holes in it, nor pores or anything of that sort. Of the 2 things we are discussing, ceramics are much more likely to have a porous structure. I dont know if these knives do, its not discussed in the video. Some steel kitchen knives have edge angles of 10 degrees total. Can anyone measure a ceramic knife to find out the geometry of one?
wolpack1116 2 years ago
it's not the edge angle I'm talking about, it's the edge itself, in a steel knife, the edge when looked close enough looks a lot like a saw, the edge on a ceramic blade is smooth and free from teeth, this is what makes them perfect at keeping food from transferring to another, the surface of a steel blade naturally has miniscule holes throughout the surface because of how the steel was made and manufactured, in a ceramic knife, the grains of zircon are so small that they leave a clean surface.
flamedrag18 2 years ago
No conventionally processed steel has these holes in it you're talking about. If you have seen them, do you have a size? None of the micrographs I've ever seen show any holes in steels, even up to 3000x mag. Also, the teeth sometimes seen on steel blades can be polished away easier than the ones on ceramic blades. Steels are tough enough that these teeth will actually work on a steel blade, where on a ceramic blade they will break off, leaving a dull edge.
wolpack1116 2 years ago
Virtually unbreakable and tougher than steel? Hardly. Tougher than other common ceramics, yes. These are not amorphous like obsidian or glass and I doubt they can be honed as sharp as a steel knife, though they certainly seem to do the job on sushi, and as long as they cut only wood cutting boards and fish, they should stay sharp for years, maybe for 10 to 20 with great care against hitting anything hard that could chip the blade.
wolpack1116 2 years ago
It's actually quite a bit sharper than anything steel can hold. Because of its hardness, you can create a much thinner edge to it, which is what makes things sharp. The reason steel is used is because it's more flexible. If you hit this stuff, it'd break, where as steel would bend.
Bertziethegreat 2 years ago
Do you have any comparison testing of side by side kyocera and steel knives? Any CATRA testing? That may not be fair, since I think CATRA is a western organization and Japan may not have an equivalent. Can you whittle a hair held between your fingers with a Kyocera ceramic blade? They are tougher than they look, but I doubt the brittleness would allow them to hold as thin an edge as steel without chipping. Many cutlery steels are hard enough they wont bend, but break as well.
wolpack1116 2 years ago
If you have a fine enough abrasive, there's really no reason the ceramic knives wouldn't be able to hold an edge, assuming you don't go pounding it around against hard surfaces. But anyone that would do that with a good knife has no business owning a good knife anyways.
The hardness would be a benefit to hold an edge because it wont bend like steel would. Just need an extremely gentle sharpener to avoid chipping.
Bertziethegreat 2 years ago
No arguement there. The ceramics will hold an edge much longer than the steel blades will. My contention is that steel can take and hold a much thinner edge before it starts to chip. I've seen knives with edges of 8 degrees, total, not on one side. I dont think that ceramics could take that and not chip from moderate contact with the cutting board. The same grit abrasives would work just as well or better on steel.
wolpack1116 2 years ago
You know what we need to solve this once and for all? The Mythbusters!!
Bertziethegreat 2 years ago
your thinking of a Weak ceramic if you look into Ballistic plates like the ESAPI plate the "Department of Defence" issues there personal is made out of Boron Carbine (B4C) it can stop rounds known too man of the largest threats too personal ground troops
TerroristLarryPhillp 2 years ago
werry interesting
magiemike 2 years ago
And when are ceramic katannas coming out?
trodat07 2 years ago 15
Katanas are made using harder and softer metals to make that curvature, and colorized waves. Ceramic would sort of ruin the katana.
thepcdude 2 years ago 3
That would be SWEET.
crayzclown 2 years ago
@trodat07
Thats gonna make one hell of a freaking samurai xD
XshlomoX 1 year ago
@trodat07 I'd wish. But ceramic blades can't be longer than ten inches or so: the material is incredibly hard, but incredibly brittle. The blade shatters if it's too long, or if you put too much pressure on the blade. But they're perfect for precision slicing.
IronWyvern 1 year ago
@IronWyvern Maybe. What about a sword with steel blunt side holding the ceramic blade?
trodat07 1 year ago
@trodat07 I was thinking about that myself. Maybe a replaceable ceramic edge could work, but i'd imagine that would require near-constant replacement, due to chipping and such.
IronWyvern 1 year ago