Numerical study of rapid solidification of alumina plasma sprayed on metallic substrates - Archive ouverte HAL
Communication Dans Un Congrès Année : 2008

Numerical study of rapid solidification of alumina plasma sprayed on metallic substrates

Résumé

The recent development of the thermal spraying is to design the microstructure of coatings by controlling the sizes of the structural features within the coating. Improvements in performance can be in mechanical properties as well as functional properties. The sizes of these structural features depend essentially on the process conditions employed during production. Narrowing the crystal size distribution can be obtained from a carefully-controlled nucleation and growth process. This study describes a simple heat transfer model predicting the crystal nucleation and subsequent advance of the solidification front in an alumina sprayed splat. It involves melt undercooling, nucleation and crystal growth kinetics and the selection of the most likely nucleated alumina phase. It intends to investigate the effect of the oxide layer developed on low carbon steel substrate, on the grain sizes. Calculations were performed for various parameters: thermal contact resistance, substrate temperature. Results are presented in terms grain size densities, grain size distribution and solidification front velocity
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Dates et versions

hal-00402128 , version 1 (06-07-2009)

Identifiants

Citer

Y. Lahmar-Mebdoua, Armelle Vardelle, Pierre Fauchais, D. Gobin. Numerical study of rapid solidification of alumina plasma sprayed on metallic substrates. First International Conference on Laser Plasma Applications in Materials Science-LAPAMS'08, Jun 2008, Alger, Algeria. pp.248-251, ⟨10.1063/1.2999948⟩. ⟨hal-00402128⟩
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