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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 Print: 1093-3611
ISSN Online: 1940-4360

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

DOI: 10.1615/HighTempMatProc.v11.i2.40
pages 191-204

HEAT TRANSFER AND NON-EQUILIBRIUM PHASE CHANGE OF LAMELLAE UNDER PLASMA SPRAY CONDITIONS

Y. Lahmar-Mebdoua
Centre de Développement des Technologies Avancées, Algiers, Algeria
Armelle Vardelle
ENSIL, ESTER Technopole, 87068 Limoges - 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
Dominique Gobin
CNRS - EM2C CentraleSupelec Université Paris-Saclay 3, rue Joliot-Curie 91190 Gif-sur-Yvette France

ABSTRACT

The properties of a plasma-sprayed coating are, to a great extent, controlled by the cooling and solidification of the droplets impinging on the part to be covered. Both processes condition the cooling rate, crystal growth and formation of the crystalline phases. This paper presents a one-dimensional heat transfer model that predicts the cooling and solidification of a liquid lamella deposited on a flat surface. It is based on the solution of the time-dependent heat equation in the splat and the substrate coupled by an interface thermal resistance and takes into account the melt undercooling and crystal nucleation. The calculations are performed for alumina lamellae on steel and alumina substrates.


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