Multidisciplinary approach for investigating the hot corrosion behavior of thermal barrier coatings. Issue 16 (December 2021)

• Record Type: Journal Article
• Authors: Lyu, Guanlin; Song, Dowon; Kim, JunSeong; Lu, Zhe; Yang, Byungil; Yang, SeungCheol; Byeun, Yunki; Jung, Yeon-Gil
• Is Part Of: Journal of the European Ceramic Society. Volume 41:Issue 16(2021)
• Page Start: 324
• Page End: 333
• Publication Date: 2021-12
• Subjects: Corrosive salt -- Microstructure -- Coating -- Thermomechanical -- Thermal barrier coatings; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2021.09.001
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Herein, we propose a new multidisciplinary approach for investigating the corrosion behavior of thermal barrier coatings, combining the thermal-gradient mechanical fatigue method with hot corrosion tests. Corrosive salts (Na2 SO4 ; V2 O5 ) of varying concentrations (10−20 mg/cm 2 ) were deposited on the surface of yttria-stabilized zirconia (YSZ) coatings to evaluate the microstructural changes occurring during the reaction, via thermal graded mechanical fatigue tests. The tests were conducted at a surface temperature of 1150 °C in 10 min cycles and underwent applied uniaxial tensile loads. The corrosion tests show that the ZrV2 O7 plays an important role as an intermediate in the collapse of the lamellar structures during the reaction, which results from the repetitive precipitation of V2 O5 and m -ZrO2 from the ZrV2 O7 . The microstructure of corroded YSZ coatings exhibited a different degradation mechanism under a thermomechanical environment, compared with the testing under isothermal atmospheric conditions.