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silicon carbide

silicon carbide, chemical compound, SiC, that forms extremely hard, dark, iridescent crystals that are insoluble in water and other common solvents. Widely used as an abrasive, it is marketed under such familiar trade names as Carborundum and Crystolon. It is heat resistant, decomposing when heated to about 2,700℃; it is used in refractory materials, e.g., rods, tubes, firebrick, and in special parts for nuclear reactors. Very pure silicon carbide is white or colorless; crystals of it are used in semiconductors for high-temperature applications. Silicon carbide fibers, added as reinforcement to plastics or light metals, impart increased strength and stiffness. Silicon carbide is prepared commercially by fusing sand and coke in an electric furnace at temperatures above 2,200℃; a flux, e.g., sodium chloride, may be added to eliminate impurities. Silicon carbide was discovered (1891) by E. G. Acheson; early studies of it were made by Henri Moissan.
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A manufactured crystalline material (silicon carbide), prepared by fusing coke and sand in an electric furnace; used as an abrasive in the grinding of low-tensile-strength materials, and as a semiconductor with a maximum operating temperature of 1300°C, to rectify and detect radio waves.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


a. any of various abrasive materials, esp one consisting of silicon carbide
b. (as modifier): a Carborundum wheel
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Finally, polish the repaired area using a fine carborundum slip, stopping frequently to check you are following the natural contours of the marble.
A recent exhibit of Thrash's work at the Philadelphia Museum of Art featured his carborundum prints, his etchings, lithographs, aquatints and watercolors.
Carborundum Company, Manchester'' worth Pounds 1,000 was stolen, along with assorted ladies diamond jewellery.
With such a diversity of customers, Samco has found that Carborundum Abrasives, Niagara Falls, NY, can provide the service-short turnaround times ranging from one-half day to one full day-to help keep production on track.
(10 cm) layer of Fiberfrax [R] LDS Moldable ceramic fiber manufactured by The Carborundum Co's Fiber Division.
Rainford North End needed extra time to beat Carborundum 2-1.
Last December DuPont granted BN producer Carborundum Corp.
Mere had a solid 5-2 away win at Mossbank while Sutton Heath, Lions Grove, Carborundum and Prescot Reserves shared a point and the goals with 2-2 draws.
A new version of its Fiberfrax ceramic fiber reinforcing filler has been introduced by Carborundum Co.'s Fibers Div., Niagara Falls, N.Y.