Nano violet tungsten oxide powder may not only be applied in heat insulating window glass, but also for the preparation of nano grain size WC-Co composite powder by violet tungsten oxide spray drying-direct carbonization method.
The conventional process for preparing WC-Co composite powder is firstly prepared cobalt salt into Co powder by acid leaching, precipitation, calcination and reduction; and prepared tungsten concentrate into WC powder by smelting, calcining, reducing and carbonizing. Alcohol is used as a wet grinding medium. The Co powder and WC powder are through ball milling, spray drying and sintering to form WC-Co composite powder. The method has the disadvantages of long process flow, uneven distribution of components, uneven growth of crystal grains, large fluctuations in product performance, difficulty in quality control, low production efficiency and high manufacturing cost.
Therefore, many experts and scholars have researched new methods for preparing WC-Co composite powder, including spray conversion method, mechanical alloying method, plasma method, chemical precipitation method, oxidation-reduction method, sol-gel method, and direct carbonization method, etc. Among them, the spray conversion method is a relatively mature and advanced method, and the violet tungsten oxide spray drying-direct carbonization method has been proved to be a new technology for preparing WC-Co composite powder with simple equipment, pure phase and precise carbon content control.
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