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A novel high-entropy monoboride (Mo0.2Ta0.2Ni0.2Cr0.2W0.2)B with superhardness and low thermal conductivity

Authors :
Bingbing Fan
Yilin Zhang
Hailong Wang
Yanchun Zhou
Mingliang Li
Pengbo Zhao
Rui Zhang
Gang Shao
Hongxia Lu
Jinpeng Zhu
Hongliang Xu
Wen Liu
Source :
Ceramics International. 46:26626-26631
Publication Year :
2020
Publisher :
Elsevier BV, 2020.

Abstract

A new high-entropy monoboride (Mo0.2Ta0.2Ni0.2Cr0.2W0.2)B ceramic with a WB-type orthogonal structure was designed and synthesised by in-situ reactive hot pressing at 2000 °C and 30 MPa for 1.5 h under an argon atmosphere. The microstructure of the sintered samples was comprehensively characterised, and the formation of a high-entropy monoboride (Mo0.2Ta0.2Ni0.2Cr0.2W0.2)B ceramic was confirmed. Owing to the high density of the dislocations and strengthening metal-boron bonds, the high-entropy (Mo0.2Ta0.2Ni0.2Cr0.2W0.2)B ceramic exhibited a hardness of 48.51 ± 4.07 GPa, which enabled it to be classed as a new superhard material. In addition, the thermal conductivity (2.05 ± 0.10 W/(m·K) at 400 °C) and electric conductivity (132.30 S/cm) were determined.

Details

ISSN :
02728842
Volume :
46
Database :
OpenAIRE
Journal :
Ceramics International
Accession number :
edsair.doi...........4755f1f7baab63778f34e1e8b629ed23
Full Text :
https://doi.org/10.1016/j.ceramint.2020.07.131