From stoichiometric to non-stoichiometric high-entropy carbide: a case study of hafnium addition

IF 1.3 4区材料科学 Q3 MATERIALS SCIENCE, CERAMICS

Advances in Applied Ceramics Pub Date : 2023-08-17 DOI:10.1080/17436753.2023.2243120

Yuan Qin, Xiaofeng Wei, Ji‐Xuan Liu, Yongcheng Liang, Guo‐Jun Zhang

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引用次数: 0

Abstract

ABSTRACT High-entropy carbide (Ti0.2x Zr0.2x Hf0.2x + (1-x)Nb0.2x Ta0.2x )C x (HEC-(1-x)Hf, x = 0.6-1) ceramics with 0-40 at.% nominal carbon vacancy were prepared by adding metal Hf into (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C (HEC) as a case study. The samples prepared by spark plasma sintering at 2000oC exhibit relative densities higher than 99%, single-phase rock salt structure, and homogeneous metal elements distribution. Their lattice parameters increase gradually with the added Hf content. The lattice parameter of HEC-0.4Hf is 0.86% higher than HEC's. The average grain size of the samples decreased initially, followed by an increase as Hf content increased, which is controlled by the comprehensive effect of Hf addition and carbon vacancy. The thermal conductivities of the samples decrease with the increase of Hf addition. HEC-0.4Hf has a very low thermal conductivity of 5.6 W/m·K at room temperature, which decreases 67.8% compared to HEC. The increased phonon scattering by the carbon vacancies can be the main reason for the reduced thermal conductivity.

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从化学计量到非化学计量的高熵碳化物:铪加成的案例研究

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来源期刊

Advances in Applied Ceramics 工程技术-材料科学：硅酸盐

CiteScore

4.40

自引率

4.50%

发文量

审稿时长

5.2 months

期刊介绍： Advances in Applied Ceramics: Structural, Functional and Bioceramics provides international coverage of high-quality research on functional ceramics, engineering ceramics and bioceramics.