Bimetal


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bimetal

[¦bī¦med·əl]
(materials)
A laminate of two dissimilar metals, with different coefficients of thermal expansion, bonded together.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Bimetal

 

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).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Caption: M610 cutter face mills an aluminum-alloy/CGI bimetal engine block.
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.
15 February 2011 - India's CARE yesterday reaffirmed the ratings assigned to the long- and short-term bank facilities of Shivalik Bimetal Controls Ltd (BOM:513097) at BBB+ and PR2, respectively.
The final bimetal was pbtained by explosion welding.
The Pro-Fit line of multi-purpose hole saws cuts three to 10 times faster than the typical bimetal hole saw, depending on the type of material being cut.
The company says the multipurpose hole saw cuts wood at speeds three to 10 times faster than bimetal hole saws--depending on the type of material being cut.
Greater part of produced in this country and in the world bimetal materials is represented by hotrolled double-layer corrosion-resistant sheets.
Production cutting bimetal band saw blades, the Gladiator Emperor, resist heat, abrasion, and shock and are designed for faster, more efficient cutting of structural steels.
The valves are powered by a DURA-trol[R] solid bimetal thermostat, which is resistant to puncture and fatigue and cannot be damaged when temporarily exposed to excessive temperatures.
Seattle began prohibiting the disposal of paper and corrugated containers, aluminum and bimetal cans and bottles from commercial waste streams at the start of this year in an effort to reach a recycling goal of 60 percent.
Bimetal and carbide-tipped blades cut soft alloys quickly, but abrasive aluminum still takes a toll in reduced blade life and lost shop time, advises Jack Leonard, band saw specialist, Bahco North America, Inc.
To control the fluid temperature, a choice of bimetal switches with various settings, a PT 100 RTD or a 4 to 20 mA transmitter, are available for direct and cordless attachment to the printed board.