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Composite Material (Bimetal)

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Uploaded on Jan 24, 2012

Composite Material (Bimetal)Bimetal is a composite material consisting of two layers of different metals or alloys such as steel and aluminum, steel and niobium, aluminum and titanium, titanium and molybdenum. This material is made in three ways:First, by simultaneous rolling or pressing of two pieces of different metals.Second, by casting low-melting-point metal over high-melting-point metal and dipping high-melting-point metal into the melted low-melting-point metal. The third way: a galvanic layer of a more precious metal is applied electrolytically.Bimetal is used to increase strength and heat resistance of structures, reduce their weight in order to save expensive and scarce metals or as a material with special properties.Corrosion resistant bimetal is used in industrial production for manufacture of housing for petrochemical and nuclear energy equipment; antifriction bimetals are used for production of friction bearings; bimetals with special properties are used for manufacture of nodes in rocket and space technology.In electrical and radio equipment surface of wires of a cheaper material such as steel or aluminum is covered with a good conductor such as copper and silver. It is because the density of the alternating current drops from the periphery of the conductor to its middle.In engineering bimetal is used for manufacture of machine parts and mechanisms, such as sleeves of bearings.The use of bimetal in instrument engineering is based on the use of different values ​​of temperature coefficients of expansion of metals, which make up bimetallic plates.

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