Properties of plasma-sprayed bond coats

Increasing bond coat oxidation resistance has been clearly linked to increasing durability of the ceramic layer of thermal barrier coatings (TBCs). However, recent studies have shown that significant differences in TBC life can be achieved for different bond coats that exhibit little or no differenc...

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Bibliographic Details
Published in:Journal of thermal spray technology 1997-03, Vol.6 (1), p.85-90
Main Author: BRINDLEY, W. J
Format: Article
Language:English
Subjects:
Applied sciences
Bonding
Coating
Comparative studies
Durability
Exact sciences and technology
Metals. Metallurgy
Nonmetallic coatings
Oxidation
Oxidation resistance
Production techniques
Residual stress
Sprays
Stress relaxation
Surface treatment
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Summary:Increasing bond coat oxidation resistance has been clearly linked to increasing durability of the ceramic layer of thermal barrier coatings (TBCs). However, recent studies have shown that significant differences in TBC life can be achieved for different bond coats that exhibit little or no difference in oxidation behav-ior. These data suggest that bond coat properties other than oxidation resistance can also influence TBC life. Determination of which properties affect TBC life and how they do so could be valuable in designing new, more durable TBCs. This paper reviews the results of comparative studies of the properties of three bond coat compositions that have similar oxidation behavior but different TBC lives. An analysis of the properties indicates that the thermal cycle residual stress, calculated from the coefficient of thermal ex-pansion and the stress relaxation behavior of the three alloys, is strongly correlated to the observed dif-ferences in TBC life.[PUBLICATION ABSTRACT]
ISSN:1059-9630
1544-1016
DOI:10.1007/BF02646316