Design and characteristics of a triple-cathode cascade plasma torch for spheroidization of metallic powders

Jier QIU (邱吉尔); Deping YU (余德平); Yihong LI (李裔红); Lei LI (李磊); Tong YANG (杨彤); Yuqing DONG (董宇庆)

doi:10.1088/2058-6272/aba8ed

Plasma Science and Technology > 2020 > 22(11): 115503. > DOI: 10.1088/2058-6272/aba8ed

Jier QIU (邱吉尔), Deping YU (余德平), Yihong LI (李裔红), Lei LI (李磊), Tong YANG (杨彤), Yuqing DONG (董宇庆). Design and characteristics of a triple-cathode cascade plasma torch for spheroidization of metallic powders[J]. Plasma Science and Technology, 2020, 22(11): 115503. DOI: 10.1088/2058-6272/aba8ed

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Design and characteristics of a triple-cathode cascade plasma torch for spheroidization of metallic powders

¹ School of Mechanical Engineering, Sichuan University, Chengdu 610065, People's Republic of China
² Southwestern Institute of Physics, Chengdu 610041, People's Republic of China

Funds: The authors appreciate the supports of the Key R&D Program of Advanced Technology of Sichuan Science and Technology Department (No. 2020YFG0111).

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Received Date: April 09, 2020
Revised Date: July 19, 2020
Accepted Date: July 22, 2020

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Abstract

Abstract

Arc plasma torch is an effective tool for spheroidization of metallic powders. However, as most conventional plasma torches were not specifically designed for plasma spheroidization, they may exhibit the disadvantages of the radial injection of powders, large fluctuations in the arc voltage, large gas flow rate, and disequilibrium between multiple plasma jets during the spheroidization process. Therefore, this paper presents a triple-cathode cascade plasma torch (TCCPT) for plasma spheroidization. Its structural design, including three cathodes, a common anode, and three sets of inter-electrodes, are detailed to ensure that powders can be inserted into the plasma jet by axial injection, the arc voltage fluctuations are easily maintained at a low level, and the plasma torches can work at a relatively small gas flow rate. Experimental results showed that the proposed TCCPT exhibits the following characteristics: (1) a relatively small arc voltage fluctuation within 5.3%; (2) a relatively high arc voltage of 75 V and low gas flow rate range of 10–30 SLM; (3) easy to be maintained at the equilibrium state with the equilibrium index of the three plasma jets within 3.5 V. Furthermore, plasma spheroidization experiments of SUS304 stainless steel powers were carried out using the proposed TCCPT. Results verified that the proposed TCCPT is applicable and effective for the spheroidization of metallic powders with wide size distribution.
- triple-cathode cascade plasma torch,
- plasma jet,
- plasma spheroidization

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Design and characteristics of a triple-cathode cascade plasma torch for spheroidization of metallic powders