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

Yuquan Wei; Yong Yang; Meng Liu; Qile Li; Zhengren Huang

Journal of Materials Research and Technology (Mar 2020)

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

Yuquan Wei,
Yong Yang,
Meng Liu,
Qile Li,
Zhengren Huang

Affiliations

Yuquan Wei: State Key Laboratory of High-Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China; University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing, 100039, China
Yong Yang: State Key Laboratory of High-Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China; Corresponding authors.
Meng Liu: State Key Laboratory of High-Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China; University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing, 100039, China
Qile Li: State Key Laboratory of High-Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China; University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing, 100039, China
Zhengren Huang: State Key Laboratory of High-Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China; Corresponding authors.

Journal volume & issue: Vol. 9, no. 2
pp. 2289 – 2298

Abstract

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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 °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. Keywords: SiBCN, HfC, Oxidation mechanism

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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