It is well known that tungsten powder and tungsten carbide powder prepared from tungsten are not only the main raw material of cemented carbide, but also the main raw material of tungsten alloy with high content. The use of tungsten as an additive material is very versatile and has been used in the fields of machining, mining, geological drilling, construction tools, and military applications.

In recent years, tungsten oxide has been commonly used as a raw material for tungsten powder and doping processes for the production of metals in the cemented carbide industry. However, the structure of the pores of different tungsten oxides will have different effects on the uniformity, purity and bulkiness of the finished tungsten powder product .Therefore, by determining the physical characteristics of tungsten oxide by a related physical method that is possible to increase the yield and efficiency of tungsten powder produced by tungsten oxide to a certain extent

With the continuous development of tungsten and cemented carbide industry, the quality and performance requirements of tungsten products are also gradually increasing. In order to improve the quality and performance of tungsten products and the demand for different tungsten products, it is necessary to conduct an in-depth research on tungsten raw materials. How to distinguish the reduction performance of the raw materials of tungsten oxide is a problem that needs to be solved in the preparation process of the tungsten powder and has not been solved for a long time.

Sodium as an activator can affect the particle size of tungsten powder in the process of hydrogenation of tungsten oxide, which is of great importance to the variation of the particle size of the tungsten powder product caused by the fluctuation of the sodium content in the tungsten oxide; It is of considerable theoretical and practical significance.

Blue tungsten oxide refers to a dark blue compound typically formed in solution and containing a mixed valence of tungsten and tungsten. Wet tungsten oxide will appear blue when exposed to ultraviolet light. Industrially mentioned blue tungsten oxide refers to the composition of WO_2.72, WO_2.90 and other mixtures.

Fuel cell is a chemical equipment that convert chemical energy into electricity, which is the most promising power generation technology from the perspective of saving energy and protecting the ecological environment.

Tungsten trioxide is a transitional product in the smelting process of tungsten production. It is yellow powder and insoluble in water and is generally used in the manufacture of high melting point alloys and cemented carbides, which can also be widely used as a raw material of reverse preparation of tungsten.

Ammonium Tungsten Partial , the Chinese alias ammonium is met tungstate hydrate and the English abbreviation is the AMT that is a tungsten-related water-soluble chemical.

Yellow tungsten oxide  is a stable oxide crystal powder of tungsten. The characteristics of yellow tungsten oxide include: the density of 7.2 ~ 7.4g / cm³, the melting point of about 1470 ℃.

High-quality ultra-coarse tungsten carbide powder, often made into ultra-coarse tungsten carbide that have good strength and toughness etc., are widely used in many fields such as oil drilling, mining tools, stamping dies and hard surface materials etc.