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VACUUM ›› 2021, Vol. 58 ›› Issue (5): 66-71.doi: 10.13385/j.cnki.vacuum.2021.05.11

• Measurement and Control • Previous Articles     Next Articles

Research on the Static and Dynamic Behavior on the Plasma Torch Used for Plasma Atomization

YANG Tong, YIN Zheng-xin, QIU Ji-er, YANG Sheng-yuan, ZHANG Qing-bo, YU De-ping   

  1. Department of Mechanical Engineering,university of Sichuan, Chengdu 610065, China
  • Received:2020-12-24 Online:2021-09-25 Published:2021-09-23

Abstract: Plasma atomization is considered as one of the most promising method for manufacturing spherical metal powders.However, because of the instability of the plasma jet generated by the key plasma torch, the uniform quality and fixed yield of spherical powders are not guaranteed. The instability of plasma jet mainly results from the large-scale shunting of the arc. In this paper, the experimental investigation of the plasma torch applied for plasma atomization was carried out and corresponding voltage signal was analyzed in time, frequency and time-frequency domains to judge the movement of arc root and reveal its static and dynamic volt-ampere characteristics, so as to realize the real-time monitoring of the working state of the plasma torch. The results show that the reverse polarity plasma torch has the rising volt-amperecharacteristics, with its arc voltage increasing with the increase of the arc currentand gas flow rate. The sawtooth wave of the arc voltage, caused by large-scale shunt, is a low frequency signal with the frequency in the range of 0.2~3Hz. The short time Fourier transformwas used to analyze the arc voltage signal in real-time, which can be used to accurately monitor the generation of large scale shunting and guide the adjustment of the working parameters of the plasma torch.

Key words: plasma atomization, plasma torch, voltage-ampere characteristics, large-scale shunting

CLC Number: 

  • O533
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