Investigation of erosion mechanism of tungsten-based cathode in Ar-N2 DC arc

Naoki Sakura, Masaki Yoshida, Manabu Tanaka, Takayuki Watanabe

Research output: Contribution to journalArticle

Abstract

Direct current arc has been used in a wide industrial field. Reducing in cathode erosion is an important issue for process cost reduction, however the erosion mechanism under molecular gas as plasma supporting gas has not been clarified yet. The purpose of this research is to elucidate the erosion mechanism of tungsten based cathodes in atmospheric pressure Ar-N2 DC arc. The metal vapor generated from the cathode surface was successfully visualized by a high speed camera system with a pair of band pass filters. Combing the visualization with the cahtode temperature measurements provides the tungsten vapor evaporation mechanism; tungsten vapor was generated not from the high temperature part of the cathode tip but from the peripheral part. The arc temperature measurement confirmed that ionization of tungsten atoms in the high-temperature region of the arc caused to this characteristic distribution of tungsten vapor. These findings advance the understanding of such electrode phenomena leading to increased use time of the electrode, and as a result the industrial use of N2 arcs is expected to expand.

Original languageEnglish
Article number404002
JournalJournal of Physics D: Applied Physics
Volume52
Issue number40
DOIs
Publication statusPublished - Jul 26 2019

Fingerprint

Tungsten
erosion
Erosion
tungsten
Cathodes
arcs
cathodes
direct current
Vapors
vapors
Temperature measurement
temperature measurement
Gases
Electrodes
cost reduction
metal vapors
electrodes
high speed cameras
High speed cameras
molecular gases

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Cite this

Investigation of erosion mechanism of tungsten-based cathode in Ar-N2 DC arc. / Sakura, Naoki; Yoshida, Masaki; Tanaka, Manabu; Watanabe, Takayuki.

In: Journal of Physics D: Applied Physics, Vol. 52, No. 40, 404002, 26.07.2019.

Research output: Contribution to journalArticle

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