tungsten carbide

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.

      Tungsten carbide is a dense, metallike substance, light gray with a bluish tinge, that decomposes, rather than melts, at 2,600° C (4,700° F). It is prepared by heating powdered tungsten with carbon black in the presence of hydrogen at 1,400°–1,600° C (2,550°–2,900° F). For fabrication, a process developed in the 1920s is employed: the powdered tungsten carbide is mixed with another powdered metal, usually cobalt, and pressed into the desired shape, then heated to temperatures of 1,400°–1,600° C; the other metal, which melts, wets and partially dissolves the grains of tungsten carbide, thus acting as a binder or cement. The cemented composites of tungsten carbide–cobalt are known by many trade names, including Widia and Carboloy.

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Universalium. 2010.

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  • tungsten carbide — noun : a compound of tungsten and carbon; especially : a fine very hard crystalline gray powder WC made by heating tungsten or tungsten trioxide with carbon at a high temperature and usually bonded with cobalt or nickel in cemented carbide… …   Useful english dictionary

  • tungsten carbide — noun a very hard grey compound made by reaction of tungsten and carbon at high temperatures, used in making engineering dies, cutting and drilling tools, etc …   English new terms dictionary

  • tungsten carbide — noun a very hard, grey compound, chemical formula WC, used as an abrasive …   Wiktionary

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  • tungsten carbide — /tʌŋstən ˈkabaɪd/ (say tungstuhn kahbuyd) noun a grey powder, WC, which has a melting point of 2870°C and which is used as an abrasive, and in forming dies, and in making wear resistant mechanical parts …  

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  • Tungsten — (pronEng|ˈtʌŋstən), also known as wolfram (IPA|/ˈwʊlfrəm/), is a chemical element that has the symbol W and atomic number 74.A steel gray metal, tungsten is found in several ores, including wolframite and scheelite. It is remarkable for its… …   Wikipedia

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  • tungsten processing — Introduction       preparation of the ore for use in various products.       Tungsten exhibits a body centred cubic (bcc) crystal lattice. It has the highest melting point of all metals, 3,410° C (6,170° F), and it has high conductivity for… …   Universalium

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