4. Tungsten Powder
Technical tungsten powder grades prepared by hydrogen reduction are commercially available in average grain sizes from 0.1 µm (100nm) up to 100µm. The whole palette of grain sizes find their application in cemented carbides. The main portion of tungsten powder produced (80%) is directed into that production.
The starting powder for the powder metallurgical production of pure tungsten (ductile tungsten) and sintered tungsten alloys commonly covers grain sizes between 2and 6µm. Finer or coarse powder would be unsuitable. Fine powder has too high a sintering activity, not permitting the evaporation of trace impurities during the sintering process, while coarse powder leads to incomplete sintering under usual conditions.
Extremely coarse powder grained by classification (to separate any finer particles) exhibits excellent flow characteristics and is used in plasma spraying.
Please visit our website www.tungsten-powder.com to get more information.
没有评论:
发表评论