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Spheroidization of molybdenum powder by radio frequency thermal plasma 被引量:7
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作者 Xiao-ping Liu Kuai-she Wang +2 位作者 Ping Hu Qiang Chen Alex A.Volinsky 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2015年第11期1212-1218,共7页
To control the morphology and particle size of dense spherical molybdenum powder prepared by radio frequency(RF) plasma from irregular molybdenum powder as a precursor, plasma process parameters were optimized in th... To control the morphology and particle size of dense spherical molybdenum powder prepared by radio frequency(RF) plasma from irregular molybdenum powder as a precursor, plasma process parameters were optimized in this paper. The effects of the carrier gas flow rate and molybdenum powder feeding rate on the shape and size of the final products were studied. The molybdenum powder morphology was examined using high-resolution scanning electron microscopy. The powder phases were analyzed by X-ray diffraction. The tap density and apparent density of the molybdenum powder were investigated using a Hall flow meter and a Scott volumeter. The optimal process parameters for the spherical molybdenum powder preparation are 50 g/min powder feeding rate and 0.6 m^3/h carrier gas rate. In addition, pure spherical molybdenum powder can be obtained from irregular powder, and the tap density is enhanced after plasma processing. The average size is reduced from 72 to 62 μm, and the tap density is increased from 2.7 to 6.2 g/cm^3. Therefore, RF plasma is a promising method for the preparation of high-density and high-purity spherical powders. 展开更多
关键词 powder materials molybdenum radio frequency plasma spheroidization processing parameters
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