Thermal barrier coating adherence to Hf-modified B2 NiAl bond coatings

The durability of thermal barrier coatings (TBCs) deposited on Hf-modified B2 NiAl bond coatings has been investigated under thermal cycling conditions. The rate of bond coat oxidation and rumpling during thermal cycling was characterized and the cycles to failure measured. The location of cycling-i...

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Bibliographic Details
Published in:Acta materialia 2014-11, Vol.80, p.39-47
Main Authors: JACKSON, R. W, LIPKIN, D. M, POLLOCK, T. M
Format: Article
Language:English
Subjects:
Applied sciences
Bonding
Chromium steels
Coating
Coatings
Exact sciences and technology
Hafnium
Intermetallic compounds
Intermetallics
Metals. Metallurgy
Nickel aluminides
Nickel base alloys
Nonmetallic coatings
Production techniques
Surface treatment
Thermal cycling
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Summary:The durability of thermal barrier coatings (TBCs) deposited on Hf-modified B2 NiAl bond coatings has been investigated under thermal cycling conditions. The rate of bond coat oxidation and rumpling during thermal cycling was characterized and the cycles to failure measured. The location of cycling-induced cracks in the TBC multilayer was influenced by the bond coat composition but variation in TBC lifetime was small, despite the different failure modes. Analysis of the cycle-dependent degradation phenomena demonstrate a trade-off between rumpling resistance and interfacial toughness as a function of bond coat composition.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2014.07.033