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.
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
Materials Science and Engineering
Keywords and Phrases
Densification; High-Entropy Carbide Ceramics; Mechanical Properties; Microstructure
International Standard Serial Number (ISSN)
Article - Journal
© 2019 The American Ceramic Society, All rights reserved.
01 Dec 2019