期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 39, 期 13, 页码 3920-3924出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.05.017
关键词
High-entropy boride ceramic; Boro/carbothermal reduction; Spark plasma sintering; Microstructure; Mechanical properties
资金
- Pearl River S and T Nova Program of Guangzhou [201710010142]
- Science and Technology Planning Project of Guangdong Province [2017A050501033]
- National Natural Science Foundation of China [51402055, 51602060, U1401247]
- Guangdong Innovative and Entrepreneurial Research Team Program [2013G061, 2014YT02C049]
Starting from metal oxides, B4C and graphite, a suite of high-entropy boride ceramics, formulated (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)B-2, (Hf0.2Zr0.2Mo0.2Nb0.2Ti0.2)B-2 and (Hf0.2Mo0.2Ta0.2Nb0.2Ti0.2)B-2 derived from boro/carbothermal reduction at 1600 degrees C were fabricated by spark plasma sintering at 2000 degrees C. It was found that the synthetic high-entropy boride crystalized in hexagonal structure and the yield of the targeting phase was calculated to be over 93.0 wt% in the sintered ceramics. Benefitting from the nearly full densification (96.3% (similar to) 98.5% in relative density) and the refined microstructure, the products exhibited the relatively high Vickers hardness. The indentation fracture toughness was determined to be comparable with the single transition metal-diboride ceramics. It should be noted that the formation of high-entropy boride ceramics were featured with the relatively high hardness at no expense of the fracture toughness.
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