Tungsten Oxide Microstructure

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.

Many researchers mostly focus their research on chemical purity and macroscopic physical properties such as FSSS particle size, specific surface area, fluidity and so on. However, these rough classification methods can not describe the nature of tungsten oxide. Therefore, the research on the microstructure and morphology of tungsten oxide is helpful to the selection of raw materials in the production of cemented carbide reference.

Different tungsten oxides have different microstructures. Each tungsten oxide has its own unique crystal structure, such as yellow tungsten (WO₃), violet tungsten (WO_2.72) and blue tungsten - a variety of tungsten oxide mixture, so The physical properties are also different. Ammonium tungsten bronze (ATB) as the main phase of the smallest particle size of tungsten oxide, violet tungsten particles the most coarse and has a unique rod-shaped structure, suitable for the preparation of fine tungsten powder; In the microstructure of tungsten oxide, the surface morphology of the aggregates extends to the inside of the pellets, and the interior of the pellets is rich in cracks；Violet tungsten particles are single crystal particles, other tungsten oxide is polycrystalline particles.

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