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Fabrication and Evaluation of Plasma-Sprayed Microlaminated Thermal Barrier Coatings

Published online by Cambridge University Press:  21 February 2011

A.M. Ritter ,
J.R. Rairden  and
R.L. Mehan
A.M. Ritter
Affiliation:
GE Corporate Research & Development, P.O. Box 8, Schenectady, NY 12301
J.R. Rairden
Affiliation:
GE Corporate Research & Development, P.O. Box 8, Schenectady, NY 12301
R.L. Mehan
Affiliation:
GE Corporate Research & Development, P.O. Box 8, Schenectady, NY 12301
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Abstract

Microlaminated metal matrix (M3 ) composite coatings of MCrAlY/Al2O3 were fabricated using coordinated two-gun low pressure plasma deposition rocessing. These coatings are shown to hold promise as durable thermal barrier coatings (TBC's) for aircraft engine applications. The properties of analogous M3 coatings of MCrAlY/Zr)2 Y2O3 also were evaluated and found to be significantly less durable when thermplly cycled.

Microstructural analysis of the M3 coatings revealed that no interaction occurred between the alumina and metal lamellae in the MCrAlY/Al2O3 TBC's. However, alumina and chromia layers formed at the metal/ceramic interfaces in the ZrO2-containing TBC's, and grew into the metal layers of the ZrO2-containing TBC's during air-cycling. This growth may contribute to TBC cracking and spallation by lowering the overall coating ductility.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 190: Symposium M – Plasma Processing and Synthesis of Materials III , 1990 , 17
Copyright
Copyright © Materials Research Society 1991

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References

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