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Multi-Phase Functionally Graded Materials for Thermal Barrier Systems

Published online by Cambridge University Press:  10 February 2011

M. R. Jackson,
A. M. Ritter,
M. F. Gigliotti,
A. C. Kaya and
J. P. Gallo
M. R. Jackson
Affiliation:
Electric CRD, Schenectady, NY 12309 jacksmr@crd.ge.com
A. M. Ritter
Affiliation:
Electric CRD, Schenectady, NY 12309 jacksmr@crd.ge.com
M. F. Gigliotti
Affiliation:
Electric CRD, Schenectady, NY 12309 jacksmr@crd.ge.com
A. C. Kaya
Affiliation:
Electric CRD, Schenectady, NY 12309 jacksmr@crd.ge.com
J. P. Gallo
Affiliation:
Electric CRD, Schenectady, NY 12309 jacksmr@crd.ge.com
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Abstract

Metallic candidates for functionally graded material (FGM) coatings have been evaluated for potential use in bonding zirconia to a single crystal superalloy. Properties for four materials were studied for the low-expansion layer adjacent to the ceramic. Ingots were produced for these materials, and oxidation, expansion and modulus were determined. A finite element model was used to study effects of varying the FGM layers. Elastic modulus dominated stress generation, and a 20–25% reduction in thermal stress generated within the zirconia layer may be possible.

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