This study investigates the effect of gas composition on the flow characteristics of a three-cathode air plasma torch. A numerical model that couples fluid dynamic, electromagnetic, and thermal relationships is used to simulate temperature and velocity fields at the outlet of the torch. Different gases, including argon, nitrogen, and hydrogen, and gas mixtures are examined in the context of the study. The results show that the use of N2 or H2 as a secondary gas improves the output power and efficiency of the torch.

air plasma spraying, gas composition, numerical simulation, temperature profile, three-cathode plasma torch, velocity profile
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Copyright © 2013 ASM International. All rights reserved.
2013
ASM International
Topics
Thermal spray equipment Plasma spray coating Process modeling and simulation Flow rate Temperature Heat transfer properties
Issue Section:
Research and Development
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