When the temperature is gradually raised above 800 ° C, tungsten will not be evaporated because the melting point of tungsten is 3420 ° C. While the tungsten oxide has a boiling point of 800 ° C, the tungsten oxide will sublimate to vapor tungsten oxide. At the same time, it will follow the gas-solid reaction model model, tungsten oxide nano flower structure growth mechanism is as follows:

In general, the HRC hardness of tungsten based cemented carbide is between 24~32, and at present the market needs tungsten based alloy products with high hardness special-shaped parts or plates, the hardness of HRC alloy for more than 35, now can only rely on the forging deformation treatment the hardness, but the complexity of the production process, equipment investment, the production cost is high, the profit is very low, the lack of market competitiveness;

As a semiconductor material (its band gap can be 2.4 to 2.8eV), tungsten oxide is widely used in photoelectrochemistry. The violet tungsten WO_2.72 has been paid special attention to by the researchers because of its unique properties and structures.

The ultrafine cemented carbide made of ultrafine tungsten carbide powder has the characteristics of high strength and high hardness. It effectively solves the contradiction between hardness and strength of traditional cemented carbide, widely used in the production of integrated circuit board micro drill, dot matrix printer print needle, precision mould, tool, woodworking tools, medical drill etc..

Tungsten catalyst in a large number of materials, with special surface structure of violet  tungsten oxide, oxygen defect structure of high chemical activity and high concentration, and in the ultraviolet has a high degree of absorption, at the same time, research shows that copper as doping elements can improve the catalyst in the visible light response range. Therefore, the selection of copper doped violet tungsten as a photocatalytic material has a good application prospect.

The production of APT in China is mainly ion exchange and extraction. The quality of APT products produced by the two processes is generally the national standard zero grade products. The rest are the first grade or unqualified products of the national standard, and the disqualified products can only be sold at a low price, which not only directly affects the production efficiency of the enterprises, but also affects the quality of the subsequent tungsten deep processing products.