射频感应等离子体制备球形钨粉的工艺研究
RF induction plasma spheroidization of tungsten powders
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摘要: 采用射频感应等离子体球化颗粒形状不规则的钨粉（平均粒度尺寸5～12 μm），研究了加料速率、物料分散方式、钨粉颗粒大小等因素对球化率的影响。当加料速率大于95 g/min时,粉体的球化率随着加料速率的增大急剧减小，加料速率增大到135.75 g/min时，样品钨粉球化率仅为30%。当携带气量为0.12 m3/h 时，分散效果较佳，其球形度相应也较好，球化率几乎达到100%；随着钨粉球化率提高，其松装密度有所增大。通过对不同粒度分布的原粉进行球化处理，得出结论：钨粉原粉粒度分布均匀，则相应制备出的球形钨粉的粒度分布也比较均匀。Abstract: Irregularly-shaped tungsten powders(average granular sizes of 5~12 μm) have been spheroidized by radio frequency(RF) induction plasma. The effects of feed rate, mode of material dispersion, particle size on spheroidization efficiency are investigated. Experimental results show that the spheroidization efficiency decreases rapidly when the feed rate increases to more than 95 g/min. Only 30% spheroidization efficiency is gained at the feed rate of 135.75 g/min. The spheroidization efficiency is also affected by the flow rate of carrier gas. When the flow rate of carrier gas is 0.12 m3/h, the dispersion effect is the best, and the spheroidization efficiency is almost 100%. The apparent density of tungsten powders increases a bit with the increase of spheroidization efficiency. And the partic
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Key words:
- radio frequency induced plasma /
- spheroidization /
- tungsten powder
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