Stability of SrO–La2O3–Al2O3–SiO2 glass sealants in high-temperature air and steam. Issue 6 (1st May 2016)

• Record Type: Journal Article
• Authors: Wang, Xiuling; Ou, Ding Rong; Zhao, Zhe; Cheng, Mojie
• Is Part Of: Ceramics international. Volume 42:Issue 6(2016)
• Page Start: 7514
• Page End: 7523
• Publication Date: 2016-05-01
• Subjects: Solid oxide fuel cells/solid oxide electrolysis cells -- Glass sealants -- Network structure -- Glass stability; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.01.158
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: SrO–La2 O3 –Al2 O3 –SiO2 glasses with different SrO content are prepared and their stability in high temperature air and steam are investigated. All glasses are stable during 1000 h test at 800 °C in air. Nevertheless, the high–SrO glasses (≥40 mol%) are devitrified on the surfaces when they are treated at 850–900 °C in air or exposed to steam. 29 Si magic–angle–spinning nuclear magnetic resonance study reveals weaker connections between [SiO4 ] tetrahedral units and increased micro–heterogeneity of glass networks with increasing SrO content, which should be responsible to the lower stability of the high–SrO glasses. It indicates that a careful control of SrO content is necessary to develop stable SrO–La2 O3 –Al2 O3 –SiO2 glass sealants for solid oxide fuel cells and solid oxide electrolysis cells.