Thermal Shock Resistance of APS 8YSZ Thermal Barrier Coatings on Titanium Alloy

• Published in: Journal of thermal spray technology Vol. 21; no. 2; pp. 335 - 343
• Main Authors: Zeng, Shuibing, Liu, Yangjia, Fan, Xizhi, Huang, Wenzhi, Gu, Lijian, Zou, Binglin, Chen, Xiaolong, Khan, Zuhair S., Zhu, Ling, Yang, Daowu, Cao, Xueqiang
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.03.2012; Springer; Springer Nature B.V
• Subjects: Analytical Chemistry; Applied sciences; Characterization and Evaluation of Materials; Chemistry and Materials Science; Coating; Corrosion and Coatings; Cracks; Diffusion; Exact sciences and technology; Failure; Machines; Manufacturing; Materials Science; Metals. Metallurgy; Nonmetallic coatings; Peer-Reviewed; Processes; Production techniques; Shock resistance; Surface treatment; Surfaces and Interfaces; Thermal barrier coatings; Thermal insulation; Thermal shock; Thin Films; Titanium; Titanium base alloys; Tribology; titanium alloy; 8YSZ; thermal insulation; thermal shock; plasma spraying; Plasma; Thermal shock resistance; Thermal shock; Hot spraying; Plasma spraying; Non metal coating; Thermal barrier; Surface treatment
• ISSN: 1059-9630; 1544-1016
• DOI: 10.1007/s11666-011-9721-2

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.