Low-Temperature Sintering of Single-Phase, High-Entropy Carbide Ceramics
Abstract
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.
Recommended Citation
L. Feng et al., "Low-Temperature Sintering of Single-Phase, High-Entropy Carbide Ceramics," Journal of the American Ceramic Society, vol. 102, no. 12, pp. 7217 - 7224, Blackwell Publishing Inc., Dec 2019.
The definitive version is available at https://doi.org/10.1111/jace.16672
Department(s)
Materials Science and Engineering
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
Citation
File Type
text
Language(s)
English
Rights
© 2019 The American Ceramic Society, All rights reserved.
Publication Date
01 Dec 2019
Comments
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.