KYOCERA Knife Test

testing of blade hardness

Category:

Education

Tags:

• kyocera
• knife
• blade
• test

[DJJimCowley]

brilliant video and done exactly how it should be done!!! everybody knows ceramic knifes are extremely sharp and hold an edge for a long time but nobody knows how well they work under stress like this.... and you have proved it!

[19trh]

@Burkemaster its a ceramic knfe. its more brittle than a steel knife. he's showing that its very durable and won't break from a fall.

[cuchilleriafernandez]

It´s very good

[herrbrahms]

@spiderpig85 A very good point. Hardness and toughness are a tradeoff. Look at watch crystals. Sapphire is preferred because of its superior scratch resistance compared to mineral glass. This is due to sapphire's greater hardness. However, with this hardness comes brittleness, i.e. lack of toughness. A sapphire crystal will scratch less than mineral, but a heavy impact can shatter the sapphire. Mineral is less likely to shatter because it is a more elastic material.

[geoatv]

@spiderpig85 Well said!

[spiderpig85]

@tehatemachine That's pretty basic forging actually. The techniques they use to do it are pretty complex however...

[tehatemachine]

@spiderpig85 you should read about what the japanese sword smiths did, they where extremely clever, they'd basically take the very hard high carbon steel and use it as the out layer of the sword while the softer steel with more iron content would be used as the core. so it has insane hardness, yet is also very soft.

[spiderpig85]

@spiderpig85 But like any piece of gear, you have to care for it.

[spiderpig85]

@depoty No problem. The problem with ceramic knives is that for every bit of hardness you get, you lose toughness. A harder, higher carbon steel will break just like a ceramic blade, where as a softer steel will not, but it won't retain as sharp of an edge. It's a balancing point that has to be approached carefully. There are other factors in a blade as well, grain, wear resistance, etc. I prefer a good non-stainless blade myself, like a Swedish high carbon steel. They get scary sharp...

[depoty]

@spiderpig85

I actually bought a Zayka folding knife with ceramic blade...in just two weeks of normal use the tip snapped off...so I think they are actually a load of crap now and I would not recommend a ceramic blade. Cold steel man you cant beat it ! I have had a serrated steel folder for 10 years and its been used big time and it still slices through stuff with ease. Hey dude Thanks for the intelligent reply by the way.

[spiderpig85]

@depoty Titanium isn't very hard. Generally when used in knives, it can be hardened to almost 50Rc, which is nowhere near the hardness of the Zircon used in these ceramic knives, which are second only to diamond. Now if they would make a pure ceramic knife without the impurities they have to put in for regulations, I would buy one...