Properties and Performance of High-Purity Thermal Barrier Coatings |
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Authors: | L Xie MR Dorfman A Cipitria S Paul IO Golosnoy TW Clyne |
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Affiliation: | (1) Sulzer Metco (US) Inc, Westbury, New York, USA;(2) Department of Materials Science & Metallurgy, University of Cambridge, Cambridge, UK |
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Abstract: | It has been found that reducing the level of impurity oxides (particularly SiO2 and Al2O3) in 7YSZ, from about 0.2 wt% to below 0.1 wt% raises the sintering resistance and the phase stability of plasma-sprayed coatings.
The implications for the usage of these coatings at elevated temperatures are examined. It is concluded that using relatively
high-purity powder of this type is likely to confer substantial benefits in terms of the thermomechanical stability of the
coatings under service conditions.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. |
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Keywords: | impurities phase stability plasma-sprayed thermal barrier coatings sintering thermal conductivity thermal cyclic life young’ s modulus |
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