Nano violet tungsten oxide for preparing thermal insulation masterbatch is one of the most widely used raw materials in tungsten powder production. It is generally obtained by calcining in a rotary kiln with ammonium paratungstate (hereinafter referred to as APT) as a raw material.
It is well known that the crystal integrity, uniformity, surface morphology, particle size and particle size distribution of tungsten carbide powder have a great influence on the properties of the alloy, and the properties of these particles depend on the properties of the nano grain size violet tungsten oxide. Therefore, for a long time, the improvement method of the quality of tungsten powder and tungsten carbide powder is mainly to optimize the reduction process and the carbonization process.
Violet tungsten oxide is a product that is difficult to precisely define chemically and physically. Its chemical composition and physical structure are also difficult to determine. The main components of VTO include ammonium tungsten bronze (ATB), hydrogen tungsten bronze (HTB), tungsten trioxide (WO3), β-tungsten oxide, γ-tungsten oxide, tungsten dioxide, and the like.
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