Tungsten is a resilient steel-gray metal, located in many different ores. While the metal was actually discovered by Carl Wilhelm Scheele in 1781, its many uses weren't discovered until the early decades of the twentieth century. Tungsten carbide has been used in mining and mechanical applications--everything from light-bulb filaments and x-ray tubes to drill bits.

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There are several ways of producing tungsten carbide, tungsten carbide producers expand the traditional method is to use a solid carbon tungsten carbide powder in the system, this method can produce powder particle size of 1 ~ 30μm tungsten carbide powder. Sumitomo Electric and Tokyo, Japan, the company successfully developed tungsten tungsten trioxide directly with the production of ultra-fine tungsten carbide powder. Currently, this method has been successfully used for industrial scale Qi production of high quality composite ultrafine tungsten carbide and carbide powder. In addition, the world carbide research, production unit also developed a spray pyrolysis conversion Huan, co-precipitation method, gas carburizing, high-energy ball milling, mechanical alloying, plasma Act and other methods.

Solid Carbon Carbonization

Tungsten carbide powder with the carbon-containing process gas phase reaction is carried out. Hydrogen-carbonization, the hydrogen and the material in the first carbon react to form hydrocarbons when the temperature is low, the main component is methane (CH4), methane is unstable at high temperatures, 1400 ℃ in full cleavage of carbon and hydrogen .

Direct Carbonization Tungsten Trioxide

Japan Tokyo Tungsten Corporation and Sumitomo Electric Industries Research and Development of tungsten trioxide prepared directly for foot-quality ultrafine tungsten carbide powder, produced by the process of the necessary equipment mixer, granulators, dryers, and two rotary furnaces components.

Nanocrystalline WC-Co Composite Powder Preparation Method

Carbide is the key to preparing nano Nano WC powder, tungsten carbide and traditional manufacturing methods can not meet this requirement. U.S. ZGBan et al mechanically activated - reduction / carbonization prepared nanocrystalline WC-Co composite powders were studied. Mechanical alloying (Mechanical Alloying) method is the use of high energy ball milling, crushing, cold welding and mechanical force action under the low temperature solid phase reaction, the chemical synthesis of nanometer WC powder. Plasma chemical vapor deposition method to prepare nano WC is a widely used method, the principle is the use of plasma generator (100kW) produces heat, methane (CH4) or acetylene (C2H2) as the carbon source, W, or WO3 as a raw material in temperature 2700-3500K under chemical vapor-phase synthesis.




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