Effects of process parameters and cooling gas on powder formation during the plasma rotating electrode process
Effects of process parameters and cooling gas on powder formation during the plasma rotating electrode process
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DOI：
10.1016/j.powtec.2021.07.062
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发表时间：
2021-08-05
影响因子：
5.2
通讯作者：
Chiba, Akihiko
中科院分区：
文献类型：
--
作者：
Cui, Yujie;Zhao, Yufan;Chiba, Akihiko
等离子体旋转电极法(PREP)正迅速成为添加剂制造中一种重要的粉末制备方法。然而，细粉的产率较低，限制了预制棒的发展。本文采用实验和数值模拟相结合的方法，研究了不同因素对制备过程中粉末形成的影响。提高旋转电极速度对减小粉末粒度的限制归因于相邻液滴团聚几率的增加和造粒倾向的降低。同时通过残余电极端面的冷却效应、扰动效应和倾斜效应确定了在旋转电极上流动的附加Ar/He气体对粉末形成的影响。与Ar气氛相比，残余电极端面的倾角较大，在氦气气氛中可以得到较小的粉末。我们的研究突出了使用PREP制备较小尺寸粉末的路线。(C)爱思唯尔出版的《2021年》。
The plasma rotating electrode process (PREP) is rapidly becoming an important powder fabrication method in additive manufacturing. However, the low production rate of fine PREP powder limits the development of PREP. Herein, we investigated different factors affecting powder formation during PREP by combining experimental methods and numerical simulations. The limitation of increasing the rotation electrode speed in decreasing powder size is attributed to the increased probability of adjacent droplets recombining and the decreased tendency of granulation. The effects of additional Ar/He gas flowing on the rotational electrode on powder formation is determined through the cooling effect, the disturbance effect, and the inclined effect of the residual electrode end face simultaneously. A smaller-sized powder was obtained in the He atmosphere owing to the larger inclined angle of the residual electrode end face compared to the Ar atmosphere. Our research highlights the route for the fabrication of smaller-sized powders using PREP. (C) 2021 Published by Elsevier B.V.