Synthesis of superfine high-entropy metal diboride powders

SCRIPTA MATERIALIA

卷:167

Article

Liu, Da¹  Wen, Tongqi²  Ye, Beilin¹  Chu, Yanhui¹ 

[1] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China

[2] Northwestern Polytech Univ, Sch Nat & Appl Sci, MOE Key Lab Mat Phys & Chem Extraordinary Conditi, Xian 710072, Shaanxi, Peoples R China

关键词: Ultra-high temperature ceramics;    High-entropy diborides;    Solid solutions;    Borothermal reduction;    First-principles calculations;   

DOI  :  10.1016/j.scriptamat.2019.03.038

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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