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Oxidation Behavior of ZrB 2 –SiC Composites at Low Pressures
Author(s) -
Tu Rong,
Sun Qingyun,
Zhang Song,
Han Mingxu,
Li Qizhong,
Hirayama Hidenori,
Zhang Lianmeng,
Goto Takashi
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13281
Subject(s) - microstructure , materials science , eutectic system , composite material , composite number , porosity , oxygen , partial pressure , chemistry , organic chemistry
ZrB 2 ‐60 mol% SiC composite with a eutectic microstructure was oxidized at 1573 to 1873 K with reduced total pressures ( P tot ) and low oxygen partial pressures ( P O 2 ). The mass change was continuously measured by a thermobalance, and then fit with a multiple paralinear model. Oxidation scale of SiO 2 / ZrO 2 + SiO 2 / ZrO 2 / ZrB 2 was formed at P O 2 > 0.13 kPa, whereas only porous ZrO 2 remained at P O 2 < 0.13 kPa, P tot < 1.33 kPa and higher than 1773 K. With increasing P O 2 , the parabolic oxidation constant decreased, whereas the linear oxidation constant increased.