tungsten bar Tungsten production process

Large number of experimental studies suggest that the anti-sagging performance and a very small amount of silicon, aluminum, potassium oxide by hydrogen reduction of tungsten tungsten ingot metal powder, tungsten oxide formed prior to incorporation of "doping effect" closely related. For the needs of industrial production, it is the role of doping-sag performance and extensive research, industrial production in general, silicon, aluminum, potassium dopant by a tungsten electrode to the tungsten oxide by hydrogen reduction to tungsten powder, mixing, pressing, burn, melt processes produce a vertical tungsten. Tungsten after swaging or rolling, blooming, annealing, drawing and other processes produce a variety of tungsten wire. In the course of a sintered tungsten, the dopant and other impurities volatilized as the tungsten rods  temperature rises. Volatile silicon and aluminum is very strong at 2 000 ~ 2 200 ℃ when more than 2 200 ℃, the aluminum basically evaporate.