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Pure Appl. Chem. Vol. 74, No. 3, pp. 441-445 (2002)

Pure and Applied Chemistry

Vol. 74, Issue 3

Splat formation in plasma-spray coating process*

Javad Mostaghimi and Sanjeev Chandra

Centre for Advanced Coating Technologies, University of Toronto, 5 King's College Road, Toronto, Ontario M5S-3G8, Canada

Abstract: The paper describes recent developments in modeling formation of plasma-spray coatings. This is a stochastic process in which particle-impact conditions, thermophysical properties, substrate topology, and temperature all play important roles in determining the structure of coating. Specific attention is paid to the simulation of droplet impact and solidification under plasma-spraying conditions. Results of 3-dimensional models show that on a flat surface solidification may cause splashing and break-up of the impacting particle. Undercooling effects result in faster solidification and, thus, smaller extent of spreading. More recent works investigate the effect of surrounding gas on dynamics of impact. It is shown that this could result in entrapment of a bubble under the droplet.

* Lecture presented at the 15th International Symposium on Plasma Chemistry, Orléans, France, 9-13 July 2001. Other presentations are presented in this issue, pp. 317–492.
** Corresponding author.


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