Nano violet tungsten oxide powder may be applied for producing infrared ultraviolet shielding material. In a hydrogen atmosphere, the violet tungsten oxide can also be reduced to obtain tungsten powder. And the prepared tungsten powder is carbonized to obtain submicron tungsten carbide powder.
In the image below, (a) and (b) are the SEM images of violet tungsten oxide. Violet tungsten oxide is mainly composed of disorderly distributed columnar or needle-like crystals. Its thickness is not uniform, but the aspect ratio is large.
In the image below, (c) is the SEM image of tungsten powder. The morphology of the W particles is generally short rod-shaped, or a chain formed by a plurality of particles. Its size is relatively uniform, and the particle size is between 0.1~1μm. In the image, (d) is the SEM image of tungsten carbide powder. The particles are mainly equiaxed. While there are still some rod-like and chain-like particles with uniform size and particle size of 0.1~1μm, but it is obviously thicker than tungsten powder. It should be noted that this change is not caused by the polymerization of a plurality of particles during the carbonization process. The tungsten atoms do not undergo large migration during carbonization, and generally a tungsten particle forms a tungsten carbide particle.
More details, please visit:
http://www.tungsten-powder.com/violet-tungsten-oxide.html
