期刊
POWDER TECHNOLOGY
卷 393, 期 -, 页码 301-311出版社
ELSEVIER
DOI: 10.1016/j.powtec.2021.07.062
关键词
Plasma rotating electrode process; Ti-6Al-4 V alloy; Rotating speed; Numerical simulation; Gas flowing; Powder size
资金
- Japan Society for the Promotion of Science [20K14619]
- Cross-ministerial Strategic Innovation Promotion Program (SIP) of Japan
- Business Incubation Program (BIP) of Tohoku University
- Grants-in-Aid for Scientific Research [20K14619] Funding Source: KAKEN
The research demonstrates that the limitation of reducing powder size by increasing the rotation electrode speed is mainly due to the increased probability of adjacent droplets recombining and the decreased tendency of granulation; the effects of additional Ar/He gas flowing on powder formation are determined by the cooling effect, the disturbance effect, and the inclined effect of the residual electrode end face.
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.
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