How to judge the quality of purple tungsten?

There are four general tungsten oxide, tungsten oxide, yellow, blue tungsten oxide, purple tungsten oxide, brown tungsten oxide. Purple tungsten oxide morphology is specific, by APT pseudo crystalline whisker-like needles formed, and blue tungsten oxide, their morphology similar with APT.

How to judge the quality of purple tungsten oxide, is a producer of research and concern; and also users of concern and must be mastered, because it directly affects the tungsten powder, tungsten carbide powder production and quality, the original purple and blue detect tungsten tungsten, yellow tungsten project the same, but the oxygen index, surface area, the proportion of false results differ. Later researchers have proposed the use of phase composition or scanning electron microscopy methods to detect and control, namely WO2.72 phase ≧ 98% or electron microscopy to detect non-needle control the number of particles (particles no needle required) these detection methods cumbersome testing costs are high, even sometimes fail to control the quality of the results. Colorimetry is a more direct control and monitoring of the quality of tungsten purple method using tungsten unique color purple, violet to several types of standard samples made of tungsten, the reference color, determine its quality. According to the producers to determine its color quality and control of purple violet tungsten tungsten production status are also available. Assay is easier detecte purple tungsten oxide quality, saving time and cost.

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