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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.137 SNIP: 0.341 CiteScore™: 0.43

ISSN Imprimir: 1093-3611
ISSN On-line: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v2.i1.40
pages 35-47

LARGE AMPLITUDE OSCILLATIONS IN ELECTRIC ARCS SUSTAINED ON HETEROGENEOUS ELECTRODES IN GASEOUS ATMOSPHERE

J. L. Doremieux
CNRS-CECM 15 Rue Georges Urbain 94407 VITRY cedex
R. Haug
Universite PARIS XI, Laboratoire de Physique des Gaz et des Plasmas, Equipe DEE SUPELEC Plateau du Moulon 91190 Gif-sur-Yvette

RESUMO

In an electric arc, which is free burning in a gaseous atmosphere between electrical contact pieces, or during etching by arcing of oxidised metal surfaces, one can observe large amplitude voltage oscillations. These oscillations should be distinguished from the ordinary voltage noise observed in most of electric arcs. They are related on the nature of the cathode material, notably on the presence on the surface of particles or layers of insulating or low conduction material, such as oxides or nitrides. The light intensity emitted by the arc is time related with the arc voltage oscillations. Interpretation of the origin of these oscillations involves temperature variations on the cathode surface and in the plasma column, and fluctuations of the concentration of the metal vapour content in the plasma.


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