4.7 Article

Preparation and characterization of diboride-based high entropy (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2-SiC particulate composites

Journal

CERAMICS INTERNATIONAL
Volume 45, Issue 18, Pages 24508-24514

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.08.178

Keywords

High entropy diboride ceramics; Particulate composites; Grain growth; Spark plasma sintering; Toughening mechanism

Funding

  1. National Natural Science Foundation of China [51532009, 51872045, 51602324]
  2. Science and Technology Commission of Shanghai Municipality [18ZR1401400]
  3. China Postdoctoral Science Foundation [2019M651323]

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High entropy ceramics have attracted much attention in recent years, however, few open literature on the composites in which high entropy phases were used as matrix can be found. In this work, high entropy diboride powder was firstly synthesized, and then monolithic high entropy diboride ceramics of (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B-2 (sample HEB) and high entropy particulate composites of (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B-2-20 vol% SiC (sample HEB-SiC) were prepared by SPS at different temperatures. As-synthesized high entropy diboride powders demonstrated good sinterability in the temperature range from 1600 degrees C to 1900 degrees C. The grain growth rate of the high entropy phase was comparable to that in the ZrB2 system, but the addition of SiC second phase particles inhibited the grain growth of the high entropy diboride phase. Due to the grain growth inhibition by the introduced SiC particles, the hardness for the particulate composites increased. Moreover, the SiC particles improved the fracture toughness through crack deflection and branching.

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