Low-Temperature Sintering of Single-Phase, High-Entropy Carbide Ceramics


Dense (Hf, Zr, Ti, Ta, Nb)C high-entropy ceramics were produced by hot pressing (HP) of carbide powders synthesized by carbothermal reduction (CTR). The relative density increased from 95% to 99.3% as the HP temperature increased from 1750°C to 1900°C. Nominally phase pure ceramics with the rock salt structure had grain sizes ranging from 0.6 µm to 1.2 µm. The mixed carbide powders were synthesized by high-energy ball milling (HEBM) followed by CTR at 1600°C, which resulted in an average particle size of ~100 nm and an oxygen content of 0.8 wt%. Low sintering temperature, high relative densities, and fine grain sizes were achieved through the use of synthesized powders. These are the first reported results for low-temperature densification and fine microstructure of high-entropy carbide ceramics.


Materials Science and Engineering


This research was conducted as part of the Enabling Materials for Extreme Environments Signature Area at Missouri S&T. The use of the Advanced Materials Characterization Laboratory is also acknowledged.

Keywords and Phrases

Densification; High-Entropy Carbide Ceramics; Mechanical Properties; Microstructure

International Standard Serial Number (ISSN)

0002-7820; 1551-2916

Document Type

Article - Journal

Document Version


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© 2019 The American Ceramic Society, All rights reserved.

Publication Date

01 Dec 2019