Synthesis of medium-entropy (Zr1/3Hf1/3Ta1/3)B2 using the spark plasma consolidation of diboride powders

Dmytro DEMIRSKYI; Tohru S. SUZUKI; Kyosuke YOSHIMI; Oleg VASYLKIV

doi:10.2109/jcersj2.20151

Regular Issue: Technical reports

Synthesis of medium-entropy (Zr_1/3Hf_1/3Ta_1/3)B₂ using the spark plasma consolidation of diboride powders

Dmytro DEMIRSKYI, Tohru S. SUZUKI, Kyosuke YOSHIMI, Oleg VASYLKIV

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Keywords: Ultra-high temperature ceramics, Spark plasma sintering, Flexural strength, Medium-entropy ceramics

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Supplementary material

2020 Volume 128 Issue 11 Pages 977-980

DOI https://doi.org/10.2109/jcersj2.20151

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Abstract

In this study, we introduce a simple and effective method for producing a ternary solid-solution of diborides, a medium-entropy Zr_1/3Hf_1/3Ta_1/3B₂. Using commercially available diboride powders with equimolar ratio and performing spark plasma consolidation at 1927 °C we demonstrate that single-phase medium-entropy ceramic can be consolidated using an hour-long procedure. The flexural strength and fracture toughness at room temperature were 318 ± 14 MPa and 2.9 MPa m^1/2, respectively.

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