Nano violet tungsten oxide for producing thermal insulation coating has a blue violet or violet red appearance. As can be seen from the image below, the appearance of the violet tungsten oxide powder maintains the appearance characteristics of the raw material APT. And the micro-morphology of violet tungsten oxide powder is different from other tungsten oxides, which are fine needle-like or rod-like crystals, forming arch bridges with each other. And the particle distribution is loose.
The main components and physical properties of violet tungsten oxide are: W18O49 content of 99%, oxygen index of 2.72, average particle size of 12.3μm, bulk density of 2.11g/cm3, BET of 2.95m2/g, and residual ammonia of 0.10%. It can be seen that the specific surface, average particle size and bulk density of violet tungsten oxide are smaller than those of blue tungsten oxide and yellow tungsten oxide.
The impurity element content of APT and the impurity element analysis result of violet tungsten oxide are shown in the following table. By comparison, the impurity element content in APT and violet tungsten oxide is basically the same, indicating that the production of violet tungsten oxide in industrial rotary furnace can ensure product purity.
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