Single-phase (Hf-Mo-Nb-Ta-Ti)C high-entropy ceramic: A potential high temperature anti-wear material

被引：78
作者：
Sun, Qichun [1 ]
Tan, Hui [1 ]
Zhu, Shengyu [1 ]
Zhu, Zongxiao [3 ]
Wang, Long [1 ]
Cheng, Jun [1 ]
Yang, Jun [1 ,2 ]
机构：
[1] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China
[2] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China
[3] Lanzhou Univ Technol, Sch Mech & Elect Engn, Lanzhou 730050, Peoples R China
来源：
TRIBOLOGY INTERNATIONAL | 2021年 / 157卷
基金：
中国国家自然科学基金;
关键词：
High-entropy carbide; Mechanical properties; Tribological behaviors; Elevated temperature; TRIBOLOGICAL PROPERTIES; SIALON CERAMICS; WIDE-RANGE; CARBIDE; TOUGHNESS; XPS; DENSIFICATION; PERFORMANCE;
D O I：
10.1016/j.triboint.2021.106883
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The single-phase (Hf0.2Mo0.2Nb0.2Ta0.2Ti0.2)C ceramics with uniform composition have been prepared by spark plasma sintering. The microstructure, mechanical and tribological properties were studied. The experimental results indicate that grain size and densification degree determine their mechanical properties. Meanwhile, the high temperature deteriorates their hardness and fracture toughness. The HEC3 sintered at 2000 degrees C exhibits excellent mechanical properties and wear resistance. Its hardness and fracture toughness are 18.5 GPa and 4.2 MPam(1/2) at 25 degrees C, respectively. And its wear rate is as low as 10(-5)-10(-7) mm(3)/Nm at 25-600 degrees C. The outstanding wear resistance benefits from the synergistic effect of the generated tribo-film and excellent mechanical properties. This material is expected to be a novel kind of high-temperature materials for tribological application.
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页数：9
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