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Oxidation of ZrB 2 –SiC‐Graphite Composites Under Low Oxygen Partial Pressures of 500 and 1500 Pa at 1800°C
Author(s) -
Jin Hua,
Meng Songhe,
Xinghong Zhang,
Qingxuan Zeng,
Weihua Xie
Publication year - 2016
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.14232
Subject(s) - partial pressure , materials science , graphite , oxygen , microstructure , diffusion , x ray photoelectron spectroscopy , composite material , composite number , kinetics , nuclear graphite , chemical engineering , chemistry , organic chemistry , physics , quantum mechanics , engineering , thermodynamics
The oxidation behavior of ZrB 2 –SiC‐graphite composites under low oxygen partial pressures of 500 and 1500 Pa at 1800°C was investigated. The phase composition and microstructure of the oxidized scale were characterized using TEM, SEM, XRD, XPS, EDS. The analytical results indicated that a low oxygen partial pressure had a remarkable effect on the oxidation mechanism of ZrB 2 –SiC‐graphite composites. When oxidized at 1500 Pa, the oxidation kinetics was controlled by the rate of oxygen diffusion into the composite. When the composite was oxidized at 500 Pa, control of the oxidation kinetics changed from the rate of oxygen diffusion to the rate of the oxidation reaction. The rate of oxidation decreased with decreasing oxygen partial pressure. Higher partial pressures of oxygen resulted in less oxidation resistance by the ZrB 2 –SiC‐graphite composites.