Ultrafine Tungsten Powder
Tungsten powder is the main raw material for processing powder metallurgy tungsten products and tungsten alloys.
With the rapid development of science and technology and extensive and deep research on nanometer technology, ultrafine tungsten powder has been developed and applied widely.
Ultrafine tungsten powder in the field of materials, through nanoparticles and a variety of ultra-fine structural modules, led to the emergence of many new materials with excellent properties and new applications. Ultrafine tungsten powder is superior to common coarse grain material in mechanical, physical and chemical properties because of its ultrafine grain and large amount of atoms on the grain boundary.
Ultrafine tungsten powder can be divided into three grades according to particle size: submicron tungsten powder (<1 um), ultrafine tungsten powder (<0.5 um) and nano tungsten powder (<100 nm). The most widely used tungsten powder is nanometer grade tungsten powder.
Ultrafine tungsten powder can be used for high proportion alloy, green bullets, alloy steel, drill, hammer and other products; high activity nanometer tungsten powder can be used as the additives of powder with high performance and high proportion alloy; also can be used for preparing nano cemented carbide. Tungsten is a kind of semiconductor material with excellent gas-sensing characteristics, sensitive to a variety of gases. Nano tungsten powder has a larger specific surface area, surface effect, have strong capability to absorb electromagnetic wave, can be used as excellent solar absorption materials and stealth materials. In addition there is a catalytic performance of nano tungsten powder special.
As ultrafine tungsten powder can be used more widely, from the beginning of 1950s, both home and abroad on the tungsten smelting industry carried out a lot of research work on the preparation of ultrafine tungsten powder for many years of systematic research, some effective methods have been developed, such as hydrogen reduction-carbonization, high energy ball milling, gas evaporation, plasma, self propagating high temperature reduction, spray drying and fluidized bed method.
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