Quality control is discussed in respect of material selection,carbonization process and pulverization classification during the production of high-quality ultrafine WC powders by conventional process.

Methods for Producing Ultrafine WC and its Composite Powder;

This paper introduces the principle of purple tungsten oxide composition and production,the details of production process control,detection methods and the use of ultra-fine tungsten powder and ultra-fine cemented carbide.

Ultra-fine WO3 particles were prepared by reverse setting,microemulsion and sol-gel methods respectively and were reduced into ultra-fine tungsten powders in hydrogen atmosphere.

The effect of phase composition of tungsten oxide on the homogeneity of ultrafine tungsten powder has been studied using a conventional hydrogen reduction technique.

And therefore, The production of ultrafine tungsten powder and ultrafine tungsten carbide powder from W_(18)O_(49) is both more.

Research on producing ultrafine tungsten powder in hydrogen reduction of tungsten oxide,roasting APT and evaporating and crystallizing of(NH4)2WO4 solution by traditional technological process in china are reviewed.