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Ablation behaviour of(Hf-Ta-Zr-Nb)C high entropy carbide ceramic at temperatures above 2100℃

Journal of Materials Science & Technology 2022年第18期113卷 40-47页

作者： Yichen Wang Buhao Zhang Chengyu Zhang Jie Yin Michael J.Reece School of Engineering and Materials Science Queen Mary University of LondonMile End RoadLondon E14NSUnited Kingdom State Key Laboratory of high Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’anShaanxi 710072China

The ablation behaviour of(Hf-Ta-Zr-Nb)C high entropy carbide(HEC4)was studied at temperatures above 2100℃using a plasma flame gun in *** microstructures,phase and chemical compositions of the HEC4 samples were investigated after *** mass ablation rate of the HEC4 samples increased with increasing ablation time from 0.21 mg cm^(−2)s^(−1)for 60 s to 0.45 mg cm^(−2)s^(−1)for 120 ***-pared to the mono-and binary carbides with commonly decreased mass and thickness after ablation,the HEC4 samples with the increased mass and thickness after ablation showed good resistance to mechan-ical scouring at such high temperatures and an oxidation controlled ablation *** ablation processes mainly include the oxidation of the carbide,the phase separation of the oxides,the melting of oxides,and the diffusion of oxygen.A composition gradient in the oxide layer was detected due to the different melting temperatures of the different oxides;Nb-Ta rich oxides formed at the front surface melted and became enriched at the edge of the samples,and the Zr-Hf rich oxides were enriched in the centre of the *** oxide layer with complex compositions and phase distributions acted as an effective ablation barrier.

关键词： high entropy carbides Transition metal carbides Ultra-high temperature ceramics Ablation resistance

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