Investigation of electrode erosion mechanism in Ar-N2DC arc based on visualization of electrode phenomena

Naoki Sakura, Masaki Yoshida, Manabu Tanaka, Takayuki Watanabe

Research output: Contribution to journalArticlepeer-review

Abstract

Cathode erosion is an important issue in the industrial applications of the direct-current arc. However, the mechanism of erosion under molecular gas has not been well clarified. The purpose of this study is to elucidate the erosion mechanism of tungsten-based cathodes in atmospheric pressure Ar-N2 DC arcs. Tungsten electrodes doped with various metal oxides as electron emitters were investigated. The metal vapor from the cathode was successfully visualized by an optical system that combined a high-speed camera with bandpass filters. The difference in the electrode temperature distribution due to the additives is explained with two factors. The first is the thermal factor that the high melting point additive is difficult to spread on the cathode surface. The second is the chemical factor that the emitter is reduced by nitrogen radicals. Advances in the understanding of such electrode phenomena are expected to lead to expanded applications of nitrogen arcs.

Original languageEnglish
Article number116001
JournalJapanese journal of applied physics
Volume59
Issue number11
DOIs
Publication statusPublished - Nov 2020

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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