Oxidation behavior of ZrB₂-SiC-ZrC at 1700 °C

详细信息    查看全文

• 作者：Yuki Kubota^a ; ^{kubota@chofu.jaxa.jp} ; ^{kubota.yuuki@jaxa.jp} ; Hiroki Tanaka^b ; Yutaro Arai^c ; Ryo Inoue^b ; Yasuo Kogo^b ; Ken Goto^d
• 关键词：Ultrahigh-temperature ceramic ; Volatility diagram ; Ternary system ceramic ; ZrB2-SiC-ZrC ; Oxidation
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：37
• 期：4
• 页码：1187-1194
• 全文大小：5129 K
• 卷排序：37

文摘

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.