Journal
JOURNAL OF THERMAL SPRAY TECHNOLOGY
Volume 21, Issue 2, Pages 335-343Publisher
SPRINGER
DOI: 10.1007/s11666-011-9721-2
Keywords
plasma spraying; thermal insulation; thermal shock; titanium alloy; 8YSZ
Categories
Funding
- Lotus Scholars Program of Hunan
- [NSFC-50825204]
- [NSFC-21001017]
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Thermal barrier coatings (TBCs) with a typical 8YSZ ceramic top coat and CoNiCrAlY bond coat were deposited on titanium alloy substrate (Ti-6Al-4V in wt.%) by air plasma spraying. Thermal insulation and thermal shock resistance of the TBCs at different temperatures as well as their failure behavior were investigated. The results showed that the test temperature had a significant effect on thermal shock life of the TBCs. Failure of the TBCs systems was caused by the formation of crack, bond coat oxidation and elemental diffusion. The vertical cracks induced by thermal shock cycles were probably responsible for the enhancement in thermal shock resistance of the TBCs. Furthermore, elemental diffusion had a great effect on the acceleration of the TBCs failure. The TBCs could provide a good thermal protection for the titanium alloy substrate.
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