送粉速率对射频等离子体球化粉末性能的影响

兰州理工大学学报 ›› 2020, Vol. 46 ›› Issue (2): 19-23.

送粉速率对射频等离子体球化粉末性能的影响

尹燕¹, 赵超¹, 潘存良¹, 张瑞华^2,3

1.兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室, 甘肃兰州 730050;
2.中国钢研科技集团有限公司, 北京 100081;
3.阳江市五金刀剪产业技术研究院, 广东阳江 529533

收稿日期:2019-04-11 出版日期:2020-04-28 发布日期:2020-06-23
作者简介:尹燕(1973-),女,四川西昌人,博士,教授.
基金资助:
广东省‘扬帆计划’引进创新创业团队专项基金(2015YT02G090),广东省高端刀剪增材制造(3D打印)工程技术研究基金(509153168061),阳江市五金刀剪产业技术研究院新型研发机构初创期建设基金(611229498090)

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

摘要/Abstract

摘要： 采用射频等离子体球化技术对多次激光3D打印废弃的GH4169合金粉末颗粒进行二次改造,研究了送粉速率对粉末球化效果的影响规律,分析了粉末球化前后显微组织及性能的差异.研究结果表明:送粉速率越小,单位质量粉末吸收过多的热量而导致其气化,颗粒表面“吸附小颗粒粉末”较多,球形粉末收得率很小;送粉速率越高,单位质量粉末吸收的热量不足以熔化所有粉末颗粒,出现部分的卫星球、包覆粉等缺陷,粉末球化率降低.球化处理后的粉末颗粒显微组织主要包括胞状晶、柱状晶和微晶.在适宜的等离子体球化工艺参数下,获得的粉末颗粒球形度极佳,流动性和松装比得到显著改善,粉末平均粒径增大,粒径分布更趋均匀.

关键词: GH4169, 射频等离子体, 球化, 送粉速率

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

中图分类号:

TG113

尹燕, 赵超, 潘存良, 张瑞华. 送粉速率对射频等离子体球化粉末性能的影响[J]. 兰州理工大学学报, 2020, 46(2): 19-23.

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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