期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 39, 期 -, 页码 99-105出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2019.07.056
关键词
High-entropy ceramic; (TiZrNbTaMo)C; Microstructure; Enhanced hardness
资金
- National Natural Science Foundation of China [51602074, 51872061, 51532006, 51621091]
- Natural Science Foundation of Heilongjiang Province [E2016026]
- China Postdoctoral Science Foundation [2016 M600246]
- Heilongjiang Postdoctoral Foundation [LBH-Z16084]
A high-entropy (TiZrNbTaMo)C ceramic has been successfully fabricated by hot pressing the newly-synthesized quinary carbide powder to investigate its microstructure and mechanical properties. The carbothermal reduction process of equimolar quinary metallic oxides at 1500 degrees C for 1 h generates a carbide powder mixture, which consists mainly of TaC- and ZrC-based solid solutions. The as-synthesized powder was then sintered to form a single-phase high-entropy ceramic by a two-step hot pressing at 1850 degrees C for 1 h and 2100 degrees C for 0.5 h, respectively. The high-entropy ceramic exhibits a fine grain size of about 8.8 pina, a high compositional uniformity and a high relative density of 98.6% by adding Mo as the strategic main component. The measured nanohardness values of (TiZrNbTaMo)C ceramic are 25.3 GPa at 9.8 N and 31.3 GPa at 100 mN, respectively, which are clearly higher than those of other available high-entropy carbide ceramics. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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