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高温材料处理:国际期刊
ESCI SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN 打印: 1093-3611
ISSN 在线: 1940-4360

高温材料处理:国际期刊

DOI: 10.1615/HighTempMatProc.v3.i2-3.90
pages 235-254

D.C. Plasma Spraying: Effect of Arc root Fluctuations on Particle Behavior in the Plasma Jet

B. Dussoubs
Equipe "Plasma Laser Matériaux", ESA CNRS 6015, Université de Limoges, 123 Avenue Albert Thomas, 87060 Limoges - France
G. Mariaux
Laboratoire Sciences des Procedes Ceramiques et de Traitements de Surface UMR CNRS 6638 University of Limoges 123 avenue Albert Thomas, 87060 LIMOGES - France
Armelle Vardelle
ENSIL, ESTER Technopole, 87068 Limoges - France
Michel Vardelle
LMCTS-URA 320, University of Limoges, 123 Avenue Albert Thomas -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

ABSTRACT

In DC. plasma spraying, plasma guns involve a continuous movement of the arc root on the anode wall. This movement causes fluctuations in arc voltage and net enthalpy input to the flow and, instabilities in the jet flow. The latter are enhanced by the development of turbulence in the shear layer between the flow and the surrounding gas at rest, and by the mixing with the ambient gas. This paper addresses the effect of short-term flow fluctuations on the behavior of particles injected in the flow. The study was carried out using both numerical and experimental techniques. It shows that particle trajectory and, therefore, acceleration and heating can be affected by jet flow fluctuations. However, further experiments and calculations are required to have a better understanding of the effect on coating properties.


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