Effect of the feeding rates on the performance of RF plasma spheroidized powders

Journal of Lanzhou University of Technology ›› 2020, Vol. 46 ›› Issue (2): 19-23.

• Materials Science and Engineering • Previous Articles Next Articles

Effect of the feeding rates on the performance of RF plasma spheroidized powders

YIN Yan¹, ZHAO Chao¹, PAN Cun-liang¹, ZHANG Rui-hua^2,3

1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou Univ. of Tech. , Lanzhou 730050, China;
2. China Iron＆Steel Research Institute Group, Beijing 100081, China;
3. Hard-ware Knife Cut Industrial Technology Research Institute Yangjiang, Yangjiang 529533, China

Received:2019-04-11 Online:2020-04-28 Published:2020-06-23

Abstract

Abstract: The property modification of GH4169 alloy powder particles discarded by 3D laser printing was carried out by RF plasma spheroidization technology. In this work, the influence of powder feeding rate on the effect of powder spheroidization was studied, and the difference of microstructure along with properties before and after powder spheroidization was analyzed either. Our research results indicated that the smaller the powder feeding rate is, the more heat the unit mass powder absorbs, leading to its vaporization. The more “adsorbed small particle powder” on the particle surface, the smaller the spherical powder yield. On the other hand, the higher the powder feeding rate is, the heat absorbed by the powder per unit mass is not enough to melt all the powder particles. Some defects such as satellite ball and coated powder appear, and the spheroidization rate of the powder decreases as a result. The microstructure of granulated powder particles consists mainly of cellular crystals, columnar crystals and crystallites. By adopting appropriate parameters of plasma spheroidization, the obtained powder particles have excellent sphericity, improved fluidity and looseness ratio significantly, increased average particle size and more uniform particle size distribution.

Key words: GH4169, radio frequency plasma, spheroidization, the feeding rat

CLC Number:

TG113

YIN Yan, ZHAO Chao, PAN Cun-liang, ZHANG Rui-hua. Effect of the feeding rates on the performance of RF plasma spheroidized powders[J]. Journal of Lanzhou University of Technology, 2020, 46(2): 19-23.

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Effect of the feeding rates on the performance of RF plasma spheroidized powders

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