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气体流量对射频等离子体球化GH4169合金粉末的影响
尹燕1, 赵超1, 潘存良1, 路超2, 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, 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, 阳江 529533
摘要:
采用射频等离子体球化技术对多次激光3D打印废弃的不规则GH4169合金粉末进行二次改造,研究载气、氢气流量对球化粉末效果的影响机理.利用扫描电镜、霍尔流动仪、振实密度测试仪及激光粒度分析仪对球化前后粉末的形貌、流动性、松装比及粒度分布进行分析.结果表明,载气流量越大,粉末在等离子体火焰中停留时间越短、运动絮乱,球化率越低;氢气流量越大,单位时间内等离子体与粉末热交换越大,球化生产效率越高.经球化处理的GH4169合金粉末的流动性、松装比得到了显著的改善,粉末颗粒平均粒径增加,粒径分布变窄.
关键词:  射频等离子体  GH4169合金粉末  气体流量
DOI:10.12073/j.hjxb.2019400295
分类号:TG483;TF123
基金项目:广东省“扬帆计划”引进创新创业团队专项资助(2015YT02G090);阳江市高功率激光应用实验室有限公司新型研发机构初创期建设补助(809099997119);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补助(809099997119)
Effect of gas flow rate on the characteristics of RF plasma spheroidized GH4169 alloy powder
YIN Yan1, ZHAO Chao1, PAN Cunliang1, LU Chao2, ZHANG Ruihua2,3
1.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;2.China Iron & Steel Research Institute Group, Beijing 100081, China;3.Hardware Knife Cut Industrial Technology Research Institute Yangjiang, Yangjiang 529533, China
Abstract:
The secondary modification of irregular GH4169 alloy powder discarded from multiple laser 3D printing by RF plasma technology. The influence mechanism of carrier gas and hydrogen flow on the effect of spheroidized powder was studied. Scanning electron microscopy, Hall flow meter, tap density tester, and laser particle size analyzer were used to analyze the morphology, fluidity, looseness ratio and particle size distribution of the powder before and after spheroidization. The results show that the larger the carrier gas flow rate, the shorter the residence time of the powder in the plasma flame, the chaotic motion, and the lower the spheroidization rate.The larger the hydrogen flow rate, the greater the heat exchange between plasma and powder per unit time, and the higher the spheroidization production efficiency. The fluidity and looseness ratio of the spheroidized GH4169 alloy powder is significantly improved, the average particle size of the powder particles increases, and the particle size distribution becomes narrow.
Key words:  radio frequency plasma  GH4169 alloy power  gas flow