Tungsten Carbide Powder Special Manufacturing Process

Tungsten carbide powder special manufacturing processes include ultra-fine and nano WC powder, Co powder, WC-Co composite powder, additives and so on. Ultra-fine and nano WC powder manufacturing process can be specifically divided into WO3 direct carbonization, rapid carbothermal reduction, purple tungsten precursor preparation, plasma chemical synthesis, etc. The basic process of WO3 direct carbonization to prepare ultra-fine WC powder: it mixed WO3 powder and carbon uniformly and formed pellets in the rotary kiln two successive reduction - carbonization, resulting in ultra-fine grain WC powder; the advantages of fast carbothermal process includes rapid heating and rapid cooling, can be large-scale, high efficiency, low cost; Purple tungsten precursor preparation method to WO2.72 mainly composed of tungsten oxide having a fine needle structure, hydrogen reduction speed in favor of preparing a uniform ultrafine particles of tungsten powder and tungsten carbide powder; Plasma chemical synthesis powder prepared by high temperature plasma, the particle size of WC powder preparation is 10-50nm in and between the free carbon content can be controlled within the range of 0.1%, the oxygen content can be controlled between 0.3% -0.5%.

The new structure and ultrafine Co powder is a good improvement for this Co binder phase of metal. Co is an allotrope at low temperature hexagonal structure, brittle, easily broken during milling, the high temperature was a face-centered cubic structure, and has good toughness. The hexagonal structures were broken down and sieved to achieve a new structure Co powder. In order to prevent oxidation of Co powder released, paraffin can be used in steam Co powder particle surfaces coated with an organic thin film. In addition, in order to strengthen the binder phase and prevent uneven elution of WC abnormal grain growth, people study a new bond with different phase composition and structure, such as cobalt eutectic alloy, super-alloy bond phase powder. Advantages of the two alloys that WC grains can maintain the initial state until completion of sintering, but also by adjusting the components of the binder phase of cemented carbide to improve the red hardness and creep resistance.

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