tungsten carbide

a very hard, black or gray compound of tungsten and carbon, used in the manufacture of cutting and abrasion tools, dies, and wear-resistant machine parts.
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World English Dictionary
tungsten carbide
a fine very hard crystalline grey powder produced by heating tungsten and carbon to a very high temperature: used in the manufacture of drill bits, dies, etc. Symbol: WC; melting pt: 2870°C

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
tungsten carbide  
An inorganic carbon compound that forms a fine gray powder whose grains are dense and extremely hard. tungsten carbide is used in tools, dies, wear-resistant machine parts, and abrasives. Chemical formula: WC.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica

tungsten carbide

an important member of the class of inorganic compounds of carbon, used alone or with 6 to 20 percent of other metals to impart hardness to cast iron, cutting edges of saws and drills, and penetrating cores of armour-piercing projectiles.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Mules are outfitted with special tungsten carbide shoes that act as the
  equivalent of studded snow tires.
Comparison of tungsten carbide and stainless steel ball bearings for grinding
  single maize kernels in a reciprocating grinder.
Tungsten has a wide range of industrial uses, the largest of which is as
  tungsten carbide in cemented carbides.
The metal must be harder than the barrel steel, composed of either the best
  heat-treated tool steel or tungsten carbide.
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