Recycling high density tungsten alloy
powder by oxidization-red uction process
powder by oxidization-red uction process
(State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China)
Central South University, Changsha 410083, China)
Abstract: The processes of directly recycling high density tungsten alloy by oxidation-reduction technique were investigated. The particle size of recycled powder is fine, and the shape of powder particle is regular when the final reduction temperature is 850℃, in which the average size of the tungsten alloy p articles reduced is about 1.5μm. The average size of the alloy particles increase to 6μm and 9μm when increasing the reduction temperature to 900℃ and 950℃, respectively. However, if the reduction temperature is higher than 900℃, the surface feature of powder is complicated. Increasing reduction temperature from 900℃ to 950℃, the content o f oxygen of recycled powder decreases from 0.2314% to 0.1700%, and powder particles grow slightly. It has been also found that the chemical composition of the recycled alloy powder is the same as the initial powder.
Key words: tungsten alloy; oxidation-reduction process; recycle; saving environment