Buckling failure in air-plasma sprayed thermal barrier coatings induced by molten silicate attack. (1st March 2016)

• Record Type: Journal Article
• Authors: Shan, Xiao; Zou, Zhonghua; Gu, Lijian; Yang, Lixia; Guo, Fangwei; Zhao, Xiaofeng; Xiao, Ping
• Is Part Of: Scripta materialia. Volume 113(2016)
• Page Start: 71
• Page End: 74
• Publication Date: 2016-03-01
• Subjects: Thermal barrier coatings -- Air-plasma spray -- Buckling -- Liquid infiltration -- Calcium–magnesium-alumino-silicate; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2015.09.029
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The buckling phenomenon in air-plasma sprayed yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) induced by calcium–magnesium-alumino-silicate (CMAS) attack was investigated. The liquid CMAS infiltration due to capillary force weakened the interface and introduced a significant volume expansion (32%) in the top coat, leading to a large scale buckling of the TBC at high temperature. The dissolution and tetragonal-mononiclic phase transformation of YSZ induced by CMAS only has a negligible contribution. Graphical abstract: