Superfine cemented carbide is known as "three high alloys" for its high toughness, high strength and high hardness at the same time. It is widely used in the manufacture of microdrill, dot matrix printer, precision die, glass precision cutting, textile cutting and so on. However, in order to obtain high-performance ultra-fine cemented carbide and further improve the mechanical properties of WC cemented carbide, it is necessary to control the grain size of WC. Therefore, how to obtain uniformly distributed ultra-fine WC powder or wc-co composite powder has become a hot spot of current research. Tungsten carbide can be produced in various ways. The traditional tungsten carbide production method is made from solid carbon tungsten carbide powder, which can produce tungsten carbide powder with particle size of 1 ~ 30 m. Direct reduction carbonization technology is a kind of technology to prepare WC powder, which has the advantages of low production cost, simple process and high purity of the product. Japan sumitomo electric co., ltd. USES WO3+C powder to directly and continuously reduce carbon in a hydrogen-atmosphere rotary furnace to produce ultra-fine WC powder. Ultrafine WC powder 0.1 m was prepared by direct reduction carbonization of WO3 and carbon black. In this paper, WO3 and carbon black are used as raw materials to prepare ultra-fine WC powder by direct reduction carbonization technology, and the reaction temperature and holding time in the process of reduction carbonization are studied.

Ultra-fine grain cemented carbide has high hardness and high strength, and is widely used in the manufacture of microdrill bits, dot matrix printer needles and precision tools for the drilling of integrated circuit boards. Ultrafine tungsten carbide powder is an important raw material for the preparation of ultrafine cemented carbide. At present, the reports of preparing nanometer, ultrafine tungsten carbide powder, or the way of the composite powder is more, there are mainly tungsten oxide reduction carbonization method (that is, the traditional process), directly carbonized tungsten oxide method, plasma chemistry carbonation method, halide tungsten carbide method, since the reducing amine salt, high frequency plasma method, gas solid instead should method, freeze drying, etc. These methods, the traditional process is simple and easy, reasonable, stable and reliable, large production capacity and advanced products are of good quality, low cost and efficiency higher advantages, and is closely related with tungsten carbide production in our country, is a kind of conform to China's national conditions, more province industrial production method, the traditional process made BET size is less than 0.2 microns ultrafine tungsten carbide powder as the U.S. DOW company is the quality of the production of the tungsten carbide powder. However, other methods still have disadvantages such as complicated process, high production cost, low efficiency and many impurities, which are suitable for industrial scale production.

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