Preparation and Mechanical Properties of High-Entropy Ceramics (TiZrHfNbTa)C

We prepared dense high-entropy ceramic material (TiZrHfNbTa)C by hot pressing; the optimum hot-pressing temperature is 2000°C. At lower temperatures, zirconium oxides, hafnium oxides, and undissolved carbides were observed in the ceramic composition. The strength of the resulting ceramics at room te...

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Bibliographic Details
Published in:Journal of superhard materials 2022-10, Vol.44 (5), p.323-330
Main Authors: Vedel, D. V., Mazur, P. V., Grigoriev, O. M., Melakh, L. M., Bega, M. D., Kozak, I. V.
Format: Article
Language:English
Subjects:
Carbides
Ceramics
Chemistry
Chemistry and Materials Science
Composition
Entropy
Grain size
Hafnium oxide
Hardness
Hot pressing
Mechanical properties
Physical Chemistry
Production
Properties
Room temperature
Structure
Zirconium dioxide
Zirconium oxides
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Summary:We prepared dense high-entropy ceramic material (TiZrHfNbTa)C by hot pressing; the optimum hot-pressing temperature is 2000°C. At lower temperatures, zirconium oxides, hafnium oxides, and undissolved carbides were observed in the ceramic composition. The strength of the resulting ceramics at room temperature was 394 ± 72 MPa, at a temperature of 1600°С, it was 119 ± 31 MPa. For pure carbides, a significant drop in hardness was observed at an increased load on the indenter, while for (TiZrHfNbTa)C, hardness is retained under any load. To achieve the maximum hardness and strength of high-entropy ceramics (TiZrHfNbTa)C, the amount of ZrO 2 and HfO 2 in the composition of ceramics should be decreased with a simultaneous decrease in grain size by using submicrometer-scale powders and selecting proper technological modes of production.
ISSN:1063-4576
1934-9408
DOI:10.3103/S1063457622050094