射频等离子球化制备球形钴铬合金粉末工艺研究

Research of parameters on the effect of CoCr alloys pherical powders produced by RF plasma

本文利用等离子球化技术对在激光选区熔化过程中多次循环使用的钴铬合金粉末进行表面处理,并分析粉末显微形貌及粒度分布。结果表明,在合适的球化工艺参数下,可以获得球形度及表面形貌良好的球形粉末。球化前后粉末表面微观组织变化不大,主要为胞状晶,且随着粉末粒径的增加,枝晶结构逐渐增多。粉末粒度分析表明,等离子球化后钴铬合金粉末粒径呈现增大的趋势,主要由细颗粒粉末的气化蒸发导致。该实验有助于激光选区熔化粉末材料的循环利用问题的解决。

In this paper,the plasma spheroidization technology was used for the surface-treatment of cobalt-chromium alloy powders which were used in selective laser melting additive manufacturing process. The results show that powders with good sphericity and surface morphology can be obtained under the optimized spheroidization process parameters.There is little change of the microstructure before and after spheroidization,mainly cellular crystal,and the dendritic structure increases with the increases of powder particle size. Laser particle size analyzer shows that the particle size of cobalt-chromium alloy powder increases after plasma spheroidization,mainly due to the evaporation of fine powders.This experiment is helpful to solve the recycling problem of selective laser melting powder materials.