Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 9, Issue 2, Pages 2289-2298Publisher
ELSEVIER
DOI: 10.1016/j.jmrt.2019.12.060
Keywords
SiBCN; HfC; Oxidation mechanism
Funding
- National Key Research and Development Project [2017YFB0310600]
- National Natural Science Foundation of China [51471182]
- Shanghai International Science and Technology Cooperation Fund [17520711700, 18520744200]
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SiBCN/HfC ceramic composites were obtained via mechanical alloying and hot-press sintering. We evaluated the high-temperature oxidation resistance of the SiBCN/HfC ceramic composites after heat treatments at 1500 and 1750 degrees C in static air. The SiBCN/HfC composites have an oxidation rate constant K5-20 of 1.1 mu m(2)/h at 1500 degrees C, which is less than that for other SiBCN-based ceramics (5.4 mu m(2)/h). After oxidation at 1750 degrees C, HfO2 and HfSiO4 spherical nanocrystals resulting from the oxidation of HfC were dispersed in silica layers that acted as a dense continuous protective coating on the surface of the SiBCN/HfC samples and provided a higher resistance to high-temperature exposure. (C) 2019 Published by Elsevier B.V.
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