High-temperature corrosion behavior of zirconia ceramic in molten Na2SO4+NaVO3 salt mixture. Issue 1 (January 2016)

• Record Type: Journal Article
• Authors: Hui, Yu; Zhao, Sumei; Xu, Jiaying; Zou, Binglin; Wang, Ying; Cai, Xiaolong; Zhu, Ling; Cao, Xueqiang
• Is Part Of: Ceramics international. Volume 42:Issue 1:Part A(2016)
• Page Start: 341
• Page End: 350
• Publication Date: 2016-01
• Subjects: A. Powders: chemical preparation -- C. Corrosion -- ZrO2 phase transformation; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.08.116
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Degradation due to molten salt attack is one of the failure mechanisms of thermal barrier coatings. Thermochemical attack of the salt mixture Na2 SO4 –30 mol% NaVO3 on ZrO2 –8 mol% YO1.5 (8YSZ) at 1100 °C for different times was investigated. In the present study, 8YSZ powder was synthesized using co-precipitation route. The graded morphologies and phase compositions were examined using SEM, XRD and Raman before and after hot corrosion test. The results obtained from XRD have shown that m-ZrO2 and YVO4 were the main corrosion products after hot corrosion test at 1100 °C. The results obtained from SEM and EDS observations have shown that large polyhedron crystals of m-ZrO2 and rod-like crystals of YVO4 formed as hot corrosion products after hot corrosion test for 6 h and 24 h. The phase transformation and chemical interaction are the primary corrosion mechanisms for degradation of 8YSZ ceramic.