Oxidation behaviors of (Hf0.25Zr0.25Ta0.25Nb0.25)C and (Hf0.25Zr0.25Ta0.25Nb0.25)C-SiC at 1300-1500 °C

被引：56

作者：

Wang, Haoxuan ^{[1
]}

Wang, Shouye ^{[1
]}

Cao, Yejie ^{[1
]}

Liu, Wen ^{[2
]}

Wang, Yiguang ^{[3
]}

机构：

[1] Northwestern Polytech Univ, Sci & Technol Thermostruct Composite Mat Lab, Xian 710072, Shaanxi, Peoples R China

[2] Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450052, Henan, Peoples R China

[3] Beijing Inst Technol, Inst Adv Struct Technol, Beijing 100081, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2021年 / 60卷

基金：

中国国家自然科学基金;

关键词：

High-entropy carbide; Oxidation resistance; Oxidation mechanism; HIGH-ENTROPY CARBIDE; LOW THERMAL-CONDUCTIVITY; ZRB2-SIC COMPOSITES; MICROSTRUCTURE; CERAMICS; SILICIDE; FAILURE;

D O I：

10.1016/j.jmst.2020.05.037

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, high-entropy ceramics (Hf0.25Zr0.25Ta0.25Nb0.25)C (HZTNC) and HZTNC doped with 20 vol% SiC (HZTNC-SiC) were fabricated by spark plasma sintering. Their oxidation behavior was investigated over the temperature range of 1300-1500 degrees C for up to 60 min. Both HZTNC and HZTNC-SiC exhibited good oxidation resistance, and their weight change as a function of oxidation time obeyed a parabolic law. Through XRD, microstructure observation, and elemental mapping analysis of the oxide layers, it was found that the formation of Nb2Zr6O12, Hf6Ta2O12, and (Ta, Nb)(2)O-5 mixed-oxide layers effectively protected the matrix from further oxidation. Microcracks began to appear on the oxide layer of HZTNC at high temperatures after 60 min of oxidation. However, the addition of SiC in HZTNC suppressed these microcracks at high temperatures due to the active oxidation of SiC. Compared with the oxides formed on HZTNC, the additional formation of Hf(Zr)SiO4 on HZTNC-SiC could further improve its oxidation resistance over HZTNC ceramics. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

引用

页码：147 / 155

页数：9

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