Violet tungsten oxide is referred to as purple tungsten for short. It refers to the purple tungsten oxide produced by calcining, decomposing and reducing ammonium paratungstate (APT) under certain conditions. The phase composition of purple tungsten oxide (purple tungsten) is WO2.72 (or W18O49), English name: Violet Tungsten Oxide, abbreviated as VTO, is a purple finely divided crystalline powder, generally purple or blue-purple in color.
Violet tungsten oxide is composed of strongly fissile octahedron, and its intrinsic crystal shape is needle and rod. It is produced by reacting, reducing and deoxidizing APT in argon gas under precise temperature control. Violet tungsten and yellow tungsten oxide (referred to as yellow tungsten WO3), blue tungsten oxide (referred to as blue tungsten W20O58 or WO2.90) and brown tungsten oxide (WO3) are all tungsten oxide.
Violet tungsten has a different form and structure from other tungsten oxides. It presents needle-like and rod-like inherent crystal shapes, forming arch bridges with each other, and the particle distribution is relatively loose. Its specific surface, average particle size and bulk density are compared with blue tungsten , yellow tungsten are small. Therefore, its performance is also very different from other tungsten oxides. But also because of its unique structure, it has the advantages of fast production speed and fine particle size when producing fine tungsten powder and fine tungsten carbide powder, and is widely used in the fields of science and technology and industry.
The use of purple tungsten oxide: purple tungsten oxide is mainly used to produce metal tungsten powder and tungsten carbide powder, and can also be used to manufacture ultrafine tungsten powder and nano tungsten powder. Since the morphology of violet tungsten is the most special, each particle is a loose particle group composed of needle-shaped or rod-shaped grains. This particle structure has a large gap, which makes it have a low bulk density, which is conducive to the reduction process. The infiltration of hydrogen and the escape of water vapor in the medium promote the reduction reaction not only on the surface, but also in the interior. Therefore, there are many crystal nuclei of tungsten powder generated during hydrogen reduction, the reaction speed is fast, and the particle size is fine, which is suitable for the production of fine particle tungsten powder; In the middle stage, superfine or nanoscale tungsten and tungsten carbide powder can be produced.
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