Using Purple Tungsten Oxide Producing Ultrafine Tungsten Powder

Details: Category: Tungsten Information; Published on Monday, 25 May 2015 18:28

There are four kinds of tungsten oxide, respectively as a yellow tungsten oxide, blue tungsten oxide, purple tungsten oxide, brown tungsten oxide. These tungsten oxides can be used as the raw materials of tungsten powder. Early , domestic production of tungsten powder use yellow tungsten oxide and tungsten acid as raw materials widely in 1960s and 1970s, many developing countries have adopted blue tungsten oxide as a raw material for production . China in the 1990s, replaced by blue tungsten oxide to yellow tungsten oxide, the reason is probably that the cost is too high acid, etc., so China chooses yellow tungsten oxide instead. But what kind of raw material most suitable for the production of ultra-fine tungsten powder is still uncertain. In addition to chemical activity associated with tungsten oxide specific surface area, particle size, shape, but also its closely related crystal defects. Purple tungsten oxide has large pore volume and micro-pore volume is small, and because of its unique crystal structure between fine-grained form it chaotically distributed there is a big gap, the gap in favor of these polymers when tungsten oxide in the reduction , in favor of hydrogen permeation and water vapor to escape. In the preparation of ultrafine tungsten powder and tungsten carbide powder fine superiority, and get a good application in production.

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