Tungsten Powder
Tungsten powder is the main raw material for processing powder metallurgy tungsten and tungsten alloy.
In the extraction and smelting of tungsten, the production of metal tungsten powder is a key step in the production of tungsten and tungsten alloy because the properties of tungsten powder largely affect the subsequent operation of tungsten products.
Pure tungsten powder can be made into wires, bars, tubes, plates and other processed materials and products of a certain shape. Tungsten powder and other metal powder, can be made into all kinds of tungsten alloy, such as tungsten molybdenum alloys, tungsten rhenium alloy, tungsten copper alloy and high density tungsten alloy. Another important application of tungsten powder is to make tungsten carbide powder, and then prepare carbide tools, such as turning tools, milling cutters, drills and dies, etc.
Hydrogen tungsten reduction and carbon reduction are the main methods for the production of tungsten powder. The main production method of tungsten metal powder is the reduction of high purity tungsten oxide, blue tungsten oxide and purple tungsten oxide hydrogen, mainly used in the production of tungsten carbide, In addition, tungsten acid is also used for hydrogen reduction.
The equipment for producing tungsten powder is usually a multiple tube furnace, rotary furnace. Reduction furnace usually has several heating zone, with total hydrogen or ammonia flow in a tube furnace tube, the temperature is generally between 600 and 1200 degrees. In order to ensure the full weight of tungsten powder, the gas in the furnace tube will be excessive, and the excess gas will be recycled by the hydrogen purification system.
Tungsten powder not only has the requirement of chemical purity, but also has the requirement of physical property and technological performance. In physics, tungsten powder has the requirements of particle size, particle size distribution, particle shape and particle accumulation state, while flowability, compaction density and sintering properties are the requirements of tungsten powder.
The quality of tungsten powder is a guarantee of the superior properties of tungsten and tungsten alloys. According to the statistics, about 80% of the tungsten products in the world are produced by powder metallurgy. Therefore, the quality of most tungsten products depends on the quality of tungsten powder.
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