期刊
SCRIPTA MATERIALIA
卷 167, 期 -, 页码 110-114出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.03.038
关键词
Ultra-high temperature ceramics; High-entropy diborides; Solid solutions; Borothermal reduction; First-principles calculations
类别
资金
- National Key Research and Development Program of China [2017YFB0703200]
- Young Elite Scientists Sponsorship Program by CAST [2017QNRC001]
- National Natural Science Foundation of China [51802100]
High-purity and superfine high-entropy metal diboride powders, namely (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)B-2, were successfully synthesized via a facile borothermal reduction method at 1973 K for the first time. The as-synthesized powders with an average particle size of similar to 310 nm had a single-crystalline hexagonal structure of metal diborides and simultaneously possessed high compositional uniformity from nanoscale to microscale. In addition, their formation mechanisms were well interpreted by analyzing the thermodynamics of the possible chemical reactions based on the first-principles calculations. This work will open up a new research field on the synthesis of high entropy metal diboride powders. (C) 2019 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.
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