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.

The impurity content control and the quality control in the carbonization process in the production of coarse tungsten carbide have been studied.

Ammonium paratungstate(APT) has a great effect on the properties of the blue tungsten oxide, and blue tungsten oxide has a great effect on tungsten and tungsten carbide powder also; The tungsten carbide powder of good quality can be made from APT or blue tungsten oxide treated by a special process.