Synthesis, Microstructure and Wear Resistance of High-Entropy (Ti1/6V1/6Nb1/6Ta1/6Mo1/3)C Ceramics

被引：0

作者：

Chen H. ^{[1
]}

Wu Z. ^{[1
]}

Zhang S. ^{[1
]}

Liu M. ^{[1
,2
]}

Hai W. ^{[1
,2
]}

Chen Y. ^{[1
,2
]}

Sun W. ^{[1
,2
]}

机构：

[1] College of Materials Science and Engineering, North Minzu University, Yinchuan

[2] Key Laboratory of Powder Materials & Advanced Ceramics, North Minzu University, Yinchuan

来源：

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2022年 / 50卷 / 06期

关键词：

High-entropy ceramic; Microstructure; Spark plasma sintering; Wear resistance;

D O I：

10.14062/j.issn.0454-5648.20211150

中图分类号：

学科分类号：

摘要：

Transition metal carbide ceramics are typical representatives of ultra-high temperature ceramics with extremely high melting point and hardness. However, the toughness and wear resistance need to be improved. Based on the high-entropy theory, a multi-carbides solid solution, i.e., high-entropy carbides, has a higher melting point, a good toughness and superior friction/wear characteristics. In this paper, (Ti1/6V1/6Nb1/6Ta1/6Mo1/3)C high-entropy ceramics were prepared via spark plasma sintering (SPS) at 1 600-2100℃, and the densification behavior, phase composition, microstructure, mechanical properties and wear resistance were investigated. The results show that (Ti1/6V1/6Nb1/6Ta1/6Mo1/3)C high-entropy ceramics with a single-phase face-centered cubic structure can be obtained by sintering at 1700℃. The relative density of the high-entropy ceramics is greater than 98% at ≥1900℃. The grain size increases and the elemental distribution becomes uniform as the sintering temperature increases from 1700℃ to 2 100℃. The grain boundary sliding and oxide impurities (TiO2) aggregation occur at grain boundaries. The dislocations appear in grains. The optimal mechanical properties of the high-entropy ceramics prepared by sintering at 2100℃ can be obtained, i.e., the Vickers hardness of 20GPa, elastic modulus of 431GPa and fracture toughness of 4.46MPa∙m1/2, respectively, and the average specific wear rate is 5×10-7 mm3/(N•m), showing a superior wear resistance. © 2022, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.

引用

页码：1504 / 1511

页数：7

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