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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
ESCI SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Print: 1093-3611
ISSN Online: 1940-4360

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

DOI: 10.1615/HighTempMatProc.v8.i4.80
pages 585-598

LOW CURRENT TRANSFERRED ARC AND ANODE ATTACHMENT : EFFECT OF GAS COMPOSITION AND THE TILTING ANGLE

C. Chazelas
Laboratoire Sciences des Procédés Céramiques et de Traitements de Surface, ENSIL,16 rue d'Atlantis, 87068 LIMOGES Cedex, France
J. F. Coudert
Laboratoire Sciences des Procédés Céramiques et Traitements de Surface, UMR-CNRS 6638, Université de Limoges, 87060 Limoges Cedex, France
Pierre Fauchais
Laboratoire Sciences des Procedes Ceramiques et de Traitements de Surface UMR CNRS 6638 University of Limoges 123 avenue Albert Thomas, 87060 LIMOGES - France
Alain Grimaud
L.E.T.P., Faculté des Sciences, 2 Bd Lavoisier 49045 Angers Cedex, France

ABSTRACT

The experimental study of heat transfer between a direct current electric arc and its anode is of primary importance for the understanding of mechanisms involved, for example, in plasma cutting, metal purification, extractive metallurgy, powder synthesis.... The ultimate objective of this work is to produce nanometric particles from the condensation of metallic vapors obtained by controlled evaporation of the anode material. A transferred arc reactor was designed to generate a stable arc jet, less than 3mm in diameter, using pure argon, argon-hydrogen mixture or nitrogen as plasma forming gases (4−10 slm) and power supplied by a current regulated source (I = 15−40A). According to the nozzle internal diameter used to constrict the arc, the jet velocity is over 1000 m.s−1 and the angle between the jet axis and the normal to the anode surface can be changed from 0° to 85°. Arc voltage fluctuations and heat power to the anode were measured for various experimental conditions, leading to different attachment modes, as testified by video-records.


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