Oxidation behavior of ZrB2-SiC-ZrC at 1700 °C. Issue 4 (April 2017)

• Record Type: Journal Article
• Authors: Kubota, Yuki; Tanaka, Hiroki; Arai, Yutaro; Inoue, Ryo; Kogo, Yasuo; Goto, Ken
• Is Part Of: Journal of the European Ceramic Society. Volume 37:Issue 4(2017)
• Page Start: 1187
• Page End: 1194
• Publication Date: 2017-04
• Subjects: Ultrahigh-temperature ceramic -- Volatility diagram -- Ternary system ceramic -- ZrB2-SiC-ZrC -- Oxidation; 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.2016.10.034
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: The oxidation behaviors of four compositions of ZrB2 -SiC-ZrC and one composition of ZrB2 -SiC were studied at 1700 °C in air and under low oxygen partial pressure. Volatility diagrams for ZrB2 -SiC-ZrC and ZrB2 -SiC were used to thermodynamically elucidate the oxidation mechanisms. SiO2 and ZrO2 layers formed on the surfaces of ZrB2 -SiC-ZrC and ZrB2 -SiC oxidized at 1700 °C. A SiC-depleted layer only formed on the surface of the ZrB2 -SiC oxidized under low oxygen partial pressure. The oxide layer thickened with increasing ZrC volume content during oxidation in air and under low oxygen partial pressure. The ZrB2 -SiC-ZrC oxide surface exploded in air when the ZrC volume content was more than 50%. Under low oxygen partial pressure, the oxide surfaces of all the ZrB2 -SiC-ZrC specimens bubbled.