(Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high-entropy ceramics with low thermal conductivity

被引：497

作者：

Yan, Xueliang ^{[1
]}

Constantin, Loic ^{[2
,3
]}

Lu, Yongfeng ^{[2
]}

Silvain, Jean-Francois ^{[3
]}

Nastasi, Michael ^{[1
,4
,5
]}

Cui, Bai ^{[1
,5
]}

机构：

[1] Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA

[2] Univ Nebraska, Dept Elect Engn, Lincoln, NE 68588 USA

[3] CNRS 87, ICMCB, Pessac, France

[4] Univ Nebraska, Nebraska Ctr Energy Sci Res, Lincoln, NE USA

[5] Univ Nebraska, Nebraska Ctr Mat & Nanosci, Lincoln, NE USA

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2018年 / 101卷 / 10期

基金：

美国国家科学基金会;

关键词：

high-entropy ceramics; microstructure; spark plasma sintering; thermal conductivity; IRRADIATION RESISTANCE; MECHANICAL-PROPERTIES; BEHAVIOR; DENSIFICATION; TEMPERATURE; ALLOYS; HFC;

D O I：

10.1111/jace.15779

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A novel high-entropy carbide ceramic, (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C, with a single-phase rock salt structure, was synthesized by spark plasma sintering. X-ray diffraction confirmed the formation of a single-phase rock salt structure at 26-1140 degrees C in Argon atmosphere, in which the 5 metal elements may share a cation position while the C element occupies the anion position. (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C exhibits a much lower thermal diffusivity and conductivity than the binary carbides HfC, ZrC, TaC, and TiC, which may result from the significant phonon scattering at its distorted anion sublattice. (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C inherits the high elastic modulus and hardness of the binary carbide ceramics.

引用

页码：4486 / 4491

页数：6

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