In plasma spraying, hydrogen is widely used as a secondary working gas. Under low-pressure conditions, even small amounts of hydrogen can have a significant effect on the plasma jet as mechanisms such as diffusion and recombination come into play. This study investigates the influence of Ar-H2 mixtures on electron densities, temperature distributions, and local composition in the plasma jet using optical emission spectroscopy. Several mechanisms reported in the literature are consulted to explain the observed phenomena.

arc formation, argon-hydrogen mixtures, optical emission spectroscopy, plasma arc spraying, plasma gas, plasma jet characteristics
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2019
ASM International
Topics
Thermal spray equipment Plasma arc spraying Temperature Optical emission spectroscopy Hydrogen
Issue Section:
Novel Processes
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