1. Hydrogenation reduction of tungsten trioxide WO3 to obtain tungsten powder (average particle size 3~5μm). Then use tungsten powder and carbon black as raw materials, dry-mix tungsten powder with an average particle size of 3 to 5 μm and carbon black of the same amount with a ball mill. Heat to 1400~1700℃ in resistance furnace or induction furnace, preferably 1550~1650℃. In the hydrogen stream, W2C is initially generated and continues to react at high temperature to form tungsten carbide. Or firstly, tungsten hexacarbonyl [W(CO)6] is thermally decomposed in a CO atmosphere at 650~1000℃ to obtain tungsten powder, and then reacted with carbon monoxide at 1150℃ to obtain tungsten carbide. The temperature above this temperature can generate W2C.
2. Gas phase decomposition method. This is tungsten powder prepared by thermal decomposition of tungsten hexacarbonyl W(CO)6. Then use carbon monoxide gas for carburizing to prepare tungsten carbide. The characteristic of this method is that it does not require the high temperature of Preparation Method 1, but can easily prepare tungsten carbide at a low temperature (1150°C) using a relatively simple reaction device.
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General production method of tungsten carbide powder
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