Thermal shock performance and failure behavior of Zr6Ta2O17-8YSZ double-ceramic-layer thermal barrier coatings prepared by atmospheric plasma spraying. Issue 17 (1st September 2022)

• Record Type: Journal Article
• Authors: Liu, Q.; Hu, X.P.; Zhu, W.; Liu, G.L.; Guo, J.W.; Bin, J.
• Is Part Of: Ceramics international. Volume 48:Issue 17(2022)
• Page Start: 24402
• Page End: 24410
• Publication Date: 2022-09-01
• Subjects: Double-ceramic-layer structure -- Thermal barrier coatings -- Atmospheric plasma spraying -- Thermal shock performance -- Failure behavior; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.05.046
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Zr6 Ta2 O17 has higher fracture toughness, better phase stability, thermal insulation performance and calcium-magnesium-alumino-silicates (CMAS) attack resistance than yttria-stabilized zirconia (8 YSZ, 7–8 wt%) at temperatures above 1200 °C. However, the thermal expansion coefficients between Zr6 Ta2 O17 coating and bond coating do not match well. A double-ceramic-layer design is applied to alleviate the thermal stress mismatch. The Zr6 Ta2 O17 /8 YSZ double-ceramic-layer thermal barrier coatings (TBCs) are prepared by atmospheric plasma spraying (APS). During the thermal shock test, Zr6 Ta2 O17 /8 YSZ double-ceramic-layer TBCs exhibit a better thermal shock resistance than 8 YSZ and Zr6 Ta2 O17 single-layer TBCs. The thermal shock performance and failure mechanism of TBCs in the thermal shock test are investigated and discussed in detail.