Journal of the Chinese Ceramic Society, Volume. 50, Issue 6, 1504(2022)
Synthesis, Microstructure and Wear Resistance of High-Entropy (Ti1/6V1/6Nb1/6Ta1/6Mo1/3)C Ceramics
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?600-2 100 ℃, 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 1 700 ℃. The relative density of the high-entropy ceramics is greater than 98% at ≥1 900 ℃. The grain size increases and the elemental distribution becomes uniform as the sintering temperature increases from 1 700 ℃ 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 2 100 ℃ can be obtained, i.e., the Vickers hardness of 20 GPa, elastic modulus of 431 GPa and fracture toughness of 4.46 MPa?m1/2, respectively, and the average specific wear rate is 5×10-7 mm3/(N·m), showing a superior wear resistance.
Get Citation
Copy Citation Text
CHEN Hao, WU Zihao, ZHANG Shubo, LIU Meiling, HAI Wanxiu, CHEN Yuhong, SUN Wenzhou. Synthesis, Microstructure and Wear Resistance of High-Entropy (Ti1/6V1/6Nb1/6Ta1/6Mo1/3)C Ceramics[J]. Journal of the Chinese Ceramic Society, 2022, 50(6): 1504
Special Issue:
Received: Dec. 27, 2021
Accepted: --
Published Online: Dec. 6, 2022
The Author Email:
CSTR:32186.14.