High porosity and low thermal conductivity high entropy (Zr0.2Hf0.2Ti0.2Nb0.2Ta0.2)C

被引：191

作者：

Chen, Heng ^{[1
,2
]}

Xiang, Huimin ^{[1
]}

Dai, Fu-Zhi ^{[1
]}

Liu, Jiachen ^{[2
]}

Lei, Yiming ^{[3
]}

Zhang, Jie ^{[3
]}

Zhou, Yanchun ^{[1
,2
]}

机构：

[1] Aerosp Res Inst Mat & Proc Technol, Sci & Technol Adv Funct Composite Lab, Beijing 100076, Peoples R China

[2] Tianjin Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Adv Ceram & Machining Technol, Tianjin 300072, Peoples R China

[3] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2019年 / 35卷 / 08期

基金：

中国国家自然科学基金;

关键词：

Ultrahigh temperature ceramics (UHTCs); High entropy ceramics; (Zr0.2Hf0.2Ti0.2 Nb0.2Ta0.2)C; Thermal conductivity; Porosity; HIGH TEMPERATURE CERAMICS; MECHANICAL-PROPERTIES; ELECTRONIC-STRUCTURE; CARBIDE; STABILITY; FABRICATION; COMPOSITES; OXIDATION; HAFNIUM; ALLOYS;

D O I：

10.1016/j.jmst.2019.04.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Porous ultra-high temperature ceramics (UHTCs) are promising for ultrahigh-temperature thermal insulation applications. However, the main limitations for their applications are the high thermal conductivity and densification of porous structure at high temperatures. In order to overcome these obstacles, herein, porous high entropy (Zr0.2Hf0.2Ti0.2Nb0.2 Ta-0.2)C was prepared by a simple method combing in-situ reaction and partial sintering. Porous high entropy (Zr0.2Hf0.2Ti0.2Nb0.2Ta0.2)C possesses homogeneous microstructure with grain size in the range of 100-500 nm and pore size in the range of 0.2-1 mu m, which exhibits high porosity of 80.99%, high compressive strength of 3.45 MPa, low room temperature thermal conductivity of 0.39 W.m(-1) K-1, low thermal diffusivity of 0.74 mm(2).s(-1) and good high temperature stability. The combination of these properties renders porous high entropy (Zr0.2Hf0.2Ti0.2Nb0.2Ta0.2)C promising as light-weight ultrahigh temperature thermal insulation materials. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

引用

页码：1700 / 1705

页数：6

共 35 条

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