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Heat Treatment of Zirconia Powders with Different Morphologies Under Thermal Plasma Conditions

Published online by Cambridge University Press:  21 February 2011

M. Vardelle ,
A. Vardelle ,
A. Denoirjean  and
P. Fauchais
M. Vardelle
Affiliation:
Laboratoire “Céramiques Nouvelles” URA CNRS 320 123, rue Albert Thomas, 87060 Limoges, France
A. Vardelle
Affiliation:
Laboratoire “Céramiques Nouvelles” URA CNRS 320 123, rue Albert Thomas, 87060 Limoges, France
A. Denoirjean
Affiliation:
Laboratoire “Céramiques Nouvelles” URA CNRS 320 123, rue Albert Thomas, 87060 Limoges, France
P. Fauchais
Affiliation:
Laboratoire “Céramiques Nouvelles” URA CNRS 320 123, rue Albert Thomas, 87060 Limoges, France
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Abstract

Plasma sprayed ceramic coatings are mainly used for the protection of metal components in diesel engines, gas turbines and aeroengines. Increasing demands for better thermomechanical properties at higher temperatures require well defined and reproducible spraying conditions. The way the powder is manufactured plays an important role in the quality of the coatings. This paper presents a study carried out on three grades of zirconia powders manufactured by different processes. The heat treatment of the powders has been monitored within the plasma jet by in flight pyrometry and laser velocimetry. The particulates melting is controlled by observation of individual particulates splats collected on glass slides. A mathematical model of plasma particulates heat transfer allows to explain the obtained results.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 190: Symposium M – Plasma Processing and Synthesis of Materials III , 1990 , 175
Copyright
Copyright © Materials Research Society 1991

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References

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