Tungsten carbide-copper powder metallurgical composite is a pseudo-alloy composed of tungsten carbide with high melting point, high hardness, high conductivity and high thermal conductivity. Because of its excellent arc erosion resistance, welding resistance, high strength and high hardness, it is widely used as electrical contact materials, resistance welding, EDM and plasma electrode materials, electrothermal alloys and high density alloys. And the heat sink substrates of electronic devices such as computer central processing system, lead frame of large-scale integrated circuits and solid-state microwave tubes.

Tungsten metallurgical raw materials are classified into wolframite, scheelite and wolframite mixed ores according to their types, and tungsten concentrate, tungsten intermediate ore and tungsten slime according to their tungsten grade. There are many methods for decomposition of tungsten minerals. At present, atmospheric pressure alkaline boiling process is widely used in our country. It is characterized by the decomposition of tungsten minerals with a certain concentration prepared by fine grinding and NaOH under pressure control of 0.15-0.25 Mpa in the reactor. Because of its long service life, low cost and easy operation, this decomposition method has been used all the time.

China is rich in tungsten resources, ranking first in the world, of which scheelite accounts for more than 70%. There are many processing technologies for scheelite, among which sodium-alkali decomposition is the most important one at present. This method can effectively decompose scheelite, but its common problem is that the amount of alkali used is large, usually 2.5-3 times the theoretical amount of alkali used or even higher; in addition, high temperature, high pressure and other means are needed to promote the decomposition of scheelite.

Tungsten oxide film is a widely studied functional material. It has excellent short-wave transmittance, and its band gap can be easily adjusted by doping. Through ion implantation, ultraviolet photon irradiation and gas molecular adsorption, its optical and electrical properties will change significantly. Therefore, it has wide application prospects in optical glass, flat panel display, photoelectric conversion, electrochromic, photochromic and other fields.