Sm-doped Gd2Zr2O7 thermal barrier coatings: Thermal expansion coefficient, structure and failure. (August 2021)

• Record Type: Journal Article
• Authors: Liu, Zheng; Shen, Zaoyu; Liu, Guanxi; He, Limin; Mu, Rende; Xu, Zhenhua
• Is Part Of: Vacuum. Volume 190(2021)
• Publication Date: 2021-08
• Subjects: Thermal barrier coatings -- Microstructure -- Sm-doped Gd2Zr2O7 -- Thermal expansion coefficient -- Failure; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2021.110314
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: The Gd2 Zr2 O7 ceramic material is a promising candidate for thermal barrier coatings. In this work, Sm-doped Gd2 Zr2 O7 coating was deposited by electron beam-physical vapor deposition. The Sm-doped Gd2 Zr2 O7 coating exhibits high thermal expansion coefficient and thermal shock lifetime at 1100 °C. The thickness of TGO layer is about 15 μm at the end. It was found that the spallation of coatings resulted from the cracks coalescence. The TGO broken played a dominant role in the failure process of the Sm-doped Gd2 Zr2 O7 coating. Highlights: The Sm-doped Gd2 Zr2 O7 coating was deposited by EB-PVD. The TBCs exhibit high thermal expansion coefficient and thermal shock lifetime. The formation and coalescence of cracks lead to the spallation of TBCs.