Performance of Spherical Powder Manufactured by Arc Plasma Micro-Blasting
WU Zhining1, YAO Qing1,2, LIU Guosheng1, TU Guangjun1,2, ZHOU Zhenyu3, DING Mingwei4, XU Hui2
1 Shenzhen Aerospace Technology & Innovation, Shenzhen 518000, China 2 Shenzhen Aerospace Technology New Material, Shenzhen 518000, China 3 Zhongkexin Engineering Consulting, Beijing 100039, China 4 Shenzhen Aerospace Industry Technology Research Institute, Shenzhen 518000, China
Abstract: Anovel powder manufacturing method named Plasma Micro-Blasting Process (PMBP) is proposed and implemented in this paper. This technology makes use of the arc plasma generated by DC current power supply between a hollow tube electrode and electrically conductive material to melt the surface of the material and cause blasting to remove the spherical powder from the melt pool. Compared with conventional powder manufacturing methods, the PMBP process possesses many advantages such as high efficiency, low cost, free choice of the shape of the raw material. The powder manufactured by the PMBP typically has the shape of sphere with less content of satellite powder. In this study, copper bulk and copper tube are selected to be the anode and cathode separately. The powder with size distribution between several microns and hundreds of microns can be generated by adjusting the manufacturing parameters. The efficiency can reach 1 680 g/h when the feed speed is up to 12 mm/s. The morphology of the powder has been observed and analyzed, followed by the flowability, apparent density and content of oxygen measurements. The feasibility of the PMBP in powder metallurgy even in additive manufacturing applications has been proven.
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2020, Vol. 34 
