期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 37, 期 4, 页码 1187-1194出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2016.10.034
关键词
Ultrahigh-temperature ceramic; Volatility diagram; Ternary system ceramic; ZrB2-SiC-ZrC; Oxidation
The oxidation behaviour of four compositions of ZrB2-SiC-ZrC and one composition of ZrB2-SiC were studied at 1700 degrees 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 degrees 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. (C) 2016 Published by Elsevier Ltd.
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