Numerical Analysis of Current Attachment at Thermionic Cathode for Gas Tungsten Arc at Atmospheric Pressure

• Yamamoto Kentaro

• Tashiro Shinichi

• Tanaka Manabu

抄録

In a gas tungsten arc at atmospheric pressure, electrons are emitted from a thermionic cathode of the tungsten electrode, of which the work function would be reduced by generally adding an emitter material such as thorium oxide (ThO₂), lanthanum oxide (La₂O₃), and so on. However, there is still a lack of practical understanding of the physical behavior in the electrode region. For example, current attachment at a thermionic cathode is not yet clear. The present paper presents a methodology for predicting the current attachment at a thermionic cathode for the gas tungsten arc at atmospheric pressure in argon. It is suggested that the current attachment at thermionic cathode is dependent on work function, melting point and the Richardson constant of emitter materials.

収録刊行物

• Transactions of JWRI

  Transactions of JWRI 38 (1), 1-5, 2009-09

  大阪大学接合科学研究所

キーワード

• Numerical simulation
• Gas tungsten arc
• Cathode

詳細情報

• CRID: 1390857202732310144
• NII論文ID: 120004839447
• NII書誌ID: AA00867058
• DOI: 10.18910/5250
• HANDLE: 11094/5250
• ISSN: 03874508
• 本文言語コード: en
• データソース種別:
  • JaLC
  • IRDB
  • CiNii Articles