Influence of Substrate Preheating on the Adhesion and the Development of Residual Stresses in Plasma Sprayed Ceramic Coatings

A new instrument has been developed for measuring the generated stresses during the plasma spray process. These stresses are due to the particle quenching, the temperature gradients during spraying, the temperature fluctuations during coating formation, and the expansion mismatch between coating and...

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Bibliographic Details
Published in:Key engineering materials 1997-04, Vol.132-136 (3), p.1556-1559
Main Authors: Leger, A.C., Fauchais, Pierre, Vardelle, M.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Miscellaneous
Technical ceramics
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Description
Summary:A new instrument has been developed for measuring the generated stresses during the plasma spray process. These stresses are due to the particle quenching, the temperature gradients during spraying, the temperature fluctuations during coating formation, and the expansion mismatch between coating and substrate upon cooling. This device records in situ the curvature of a substrate during spraying and upon cooling after spraying with a contacting displacement sensor. The torch is moved back and forth parallel to the holder axis and the substrate temperature is recorded by a thermocouple welded to it. Examples of results with alumina and zirconia coatings sprayed on steel substrates are presented and discussed. (Author)
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.132-136.1556