Nano violet tungsten oxide for producing heat insulating window glass can be used to prepare tungsten powder and tungsten carbide powder. The violet tungsten oxide will directly affect the production and quality of W powder and WC powder. Therefore, how to judge the quality of violet tungsten oxide is the research concern of producers. And it is also the concern that must be mastered by users.
The detection of the original violet tungsten oxide is consistent with the yellow tungsten oxide and blue tungsten oxide projects, except that the oxygen index, the specific surface, and the pseudo-specific gravity result are different. Later, some researchers proposed to use phase composition or scanning electron microscopy to detect and control, that is, WO2.72 phase≥98% or electron microscopy to control the number of non-acicular particles (particles without needles). However, these detection methods are cumbersome, costly to detect, and sometimes even fail to achieve quality control effects. Therefore, colorimetry appeared.
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