Journal
CORROSION SCIENCE
Volume 192, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109855
Keywords
SiBCN; SiC-BN; SiC; Oxidation behavior; Oxidation mechanism
Funding
- National Natural Science Foundation of China [52002092, 51832002]
- Heilong Jiang Natural Science Fund for Young Scholars [YQ2021E017]
- National Key Research and Development Program of China [2017YFB0310400]
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The study compared the oxidation behavior and mechanism of SiBCN monoliths with SiC and SiC-BN monoliths, revealing that SiBCN monoliths had better oxidation resistance due to the positive role of BN(C) phase during oxidation. At different temperatures, SiC and SiC-BN monoliths showed different levels of oxidation damage, with SiC-BN monoliths exhibiting more cracks and bubbles compared to SiC and SiBCN monoliths.
In this study, the oxidation behavior and mechanism of SiBCN monoliths were compared with SiC and SiC-BN monoliths. At 1100-1300 degrees C, the oxide layers of SiC and SiBCN monoliths were relatively smooth and dense, while that of SiC-BN monoliths were destroyed by many bubbles. Further oxidized at 1500 degrees C, some cracks and bubbles appeared on the surfaces and interfaces of SiC-BN monoliths. The oxidation of SiC phases was thermodynamically unstable than that of C and BN, but the oxidation of BN and/or C occurred preferentially after considering the kinetic factors. BN(C) phase has a positive role on SiBCN oxidation resistance.
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