Violet Tungsten Oxide

Violet tungsten oxide, the chemical name is WO_2.72, purple or blue purple fine crystal powder, purple tungsten oxide has a unique fine needle like structure. Compared with blue tungsten and tungsten, violet tungsten has a special surface and the highest chemical activity. Therefore, violet tungsten is the most suitable for the production of ultrafine tungsten powder.

The preparation technology of purple tungsten oxide is mainly APT wet hydrogen direct reduction method, tungstic acid hydrogen reduction method, APT ammonia mild reduction method, etc., no matter which way, it must be carried out in hydrogen regenerator. The process parameters of APT production are mainly temperature, feed speed, furnace tube speed and hydrogen (or liquid ammonia) flow.

The most important of them is the reduction temperature and the inert gas flow, and some scholars have obtained the best solution when studying the APT ammonia gas reduction method for the violet tungsten oxide. In the tubular hydrogen reduction furnace, the temperature of the zone is 790 ℃, the temperature of the second zone is 805 ℃, the feed rate is 0.55 kg / min, the speed of the furnace is 2.0 r / min, the flow rate of NH₃ is 0.7 m³ / h, APT can be transformed into single phase violet tungsten (W₁₈O₄₉), and it can realize continuous industrial production.

Violet tungsten oxide is mainly used in the production of ultrafine or nanoscale tungsten and tungsten carbide. As we all know, the integrity, homogeneity, surface morphology, particle size and particle size distribution of tungsten carbide powder will have a great influence on the properties of the alloy. The characteristics of these particles depend on the properties of tungsten oxide. Tungsten carbide powders prepared with violet tungsten are small and uniform in size, narrow in size distribution and without structural aggregation. And the violet tungsten is a single phase (W₁₈O₄₉), and the nanometer ultrafine tungsten powder with homogeneous and high quality can be obtained by reduction, is the highest quality tungsten material for high-performance cemented carbide, and the production cost of ultrafine tungsten powder produced with purpolitide is lower than the yellow tungsten and blue tungsten.

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