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Intermetallic Bond Coats: Systems Compatibility and Platinum-Group Metal Additions

Published online by Cambridge University Press:  01 February 2011

Tresa Pollock ,
Dan Widrevitz ,
Russell Pong ,
Fang Cao  and
Bryan Tryon
Tresa Pollock
Affiliation:
tresap@umich.edu, University of Michigan, Department of Materials Science and Engineering, Ann Arbor, Michigan, United States
Dan Widrevitz
Affiliation:
dan.Widrevitz@123.com, University of Michigan, Department of Materials Science and Engineering, Ann Arbor, Michigan, United States
Russell Pong
Affiliation:
Pong@123.com, University of Michigan, Department of Materials Science and Engineering, Ann Arbor, Michigan, United States
Fang Cao
Affiliation:
fang.Cao@123.com, University of Michigan, Department of Materials Science and Engineering, Ann Arbor, Michigan, United States
Bryan Tryon
Affiliation:
Tryon@123.com, University of Michigan, Department of Materials Science and Engineering, Ann Arbor, Michigan, United States
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Abstract

Intermetallic interlayers are key to the performance of thermal barrier coating systems. The role of platinum group metal (PGM) additions to B2 bond coat interlayers has been investigated with emphasis on diffusional aspects of coating structure evolution and properties. Additions of Ru and Ir to NiAl reduce interdiffusion and the resultant thickness of the coating and interdiffusion zone. Relative to Pt and Pd, Ru and Ir slow diffusion. Ru additions to NiAl increase creep resistance but degrade oxidation kinetics.

Keywords

coatingdiffusionoxidation

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References

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