Oxidation mechanism and kinetics of SiBCN/HfC ceramic composites at high temperatures | Zendy

Yuquan Wei | Zendy; Yong Yang | Zendy; Meng Liu | Zendy; Qile Li | Zendy; Qing Huang | Zendy

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Oxidation mechanism and kinetics of SiBCN/HfC ceramic composites at high temperatures

Author(s) -

Yuquan Wei,

Yong Yang,

Meng Liu,

Qile Li,

Qing Huang

Publication year - 2020

Publication title -

journal of materials research and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.832

H-Index - 44

eISSN - 2214-0697

pISSN - 2238-7854

DOI - 10.1016/j.jmrt.2019.12.060

Subject(s) - materials science , ceramic , composite material , sintering , kinetics , coating , physics , quantum mechanics

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 °C in static air. The SiBCN/HfC composites have an oxidation rate constant K5-20 of 1.1 μm2/h at 1500 °C, which is less than that for other SiBCN-based ceramics (5.4 μm2/h). After oxidation at 1750 °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.

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