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Method for producing tungsten carbide
Using tungsten metal and carbon as raw materials, an average particle size of 3–5 μm tungsten powder is dry-mixed with an equal molar amount of carbon black using a ball mill. After thorough mixing, the mixture is pressed into shape and then placed in a graphite crucible. It is subsequently heated in a graphite resistance furnace or an induction furnace to a temperature ranging from 1400 to 1700°C, with the temperature carefully controlled between 1550 and 1650°C. In a hydrogen gas flow, W₂C is initially formed, and upon further reaction at high temperatures, WC is produced. Alternatively, tungsten powder can first be prepared by thermal decomposition of tungsten hexacarbonyl in a CO atmosphere at temperatures ranging from 650 to 1000°C. This tungsten powder is then reacted with carbon monoxide at 1150°C to yield WC; at temperatures higher than this, W₂C may form instead. The chemical reaction equations are as follows:
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12-23
2019
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