Modelling and experimental evidence of the cathode erosion in a plasma spray torch

Margarita Baeva, Mikhail S. Benilov, Tao Zhu, Holger Testrich, Thorben Kewitz & Rüdiger Foest
The lifetime of tungsten cathodes used in plasma spray torches is limited by processes leading to a loss of cathode material. It was reported in the literature that the mechanism of their erosion is the evaporation. A model of the ionization layer of a cathode is developed to study the diffusive transport of evaporated tungsten atoms and tungsten ions produced due to ionization by electron impact in a background argon plasma. It is shown that...
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