Also found in: Dictionary, Thesaurus, Wikipedia.


A laminate of two dissimilar metals, with different coefficients of thermal expansion, bonded together.



a metallic material consisting of two layers of heterogeneous metals or alloys (such as steel and aluminum, steel and niobium, aluminum and titanium, titanium and molybdenum). Bimetals are used to increase the strength or heat resistance of structures, to reduce their bulk while economizing on expensive or scarce materials, and to obtain materials with special characteristics when required. For example, in electrical and radio engineering, bimetals are widely used because the density of an alternating current is greater at the periphery of the conductor than at its core, and therefore it is sometimes expedient to coat the surface of a conductor made of cheaper material (steel or aluminum) with good conductive material (copper or silver). In instrument-making, the differences in temperature coefficients of expansion of the different metals in bimetallic plates are utilized. In machine-building, certain parts of machinery, such as bush bearings, are made of bimetals.

Bimetals are made primarily by simultaneous rolling or pressing of two slabs of different metals or alloys. The casting of a fusible metal onto a refractory one and the immersion of a refractory metal in a molten fusible one are also common. In electroplating, the layer of the more precious metal is applied electrolytically. The expensive and scarce harder alloys are applied to steel by electric heating (in the production of cutting tools, dies, and the like).

References in periodicals archive ?
The team also checked through experiments that the circuit breaker using the bimetal operated below AC 1 KV can be replaced by that made of the developed MIT electromagnetic switching technology.
At the interface the steel is deformed to a depth of 45 [micro]m measured from the bimetal interface.
Thickness of the corrosion-resistant layer depends upon thickness of a bimetal sheet and should correspond to that indicated in Table 1.
Compared with the carbon steel blades commonly used to cut aluminum, advanced bimetal and carbide-tipped blades provide powerful productivity advantages.
The new company, to be capitalized at 500 million yen, will be owned 40% by Daido and 60% by Bimetal Bearings Ltd.
First, it helps to realize there are two basic types currently on the market: bimetal and glass column.
The fabricated bimetal Al-CrNi austenitic steel (see Fig.
Factory preassembled and tested, the New Generation High Low Systems feature Duratrol solid bimetal thermostatic control with an automatic seven year limited warranty; mixed water capacities up to 214 gpm; adjustable high temperature limit stops set for 120[degrees]F (49[degrees]C); bronze, brass and stainless steel construction; and simple, fast setup procedures, according to the literature.
The double-column machines utilize bimetal or carbide-tipped sawbands to precisely cut solid materials as well as profiles, layers and bundles.
I am concerned about the continued use of bimetal stem thermometers, as they do not enable the user to get accurate data from a specific point in a potentially hazardous food.