Thermal Properties and Elastic Constants of ζ-Ta₄C₃₋ₓ
Thermal and elastic properties were measured for ceramics that contained as much as 96 wt% zeta phase tantalum carbide (ζ-Ta4C3-x). The ceramics were produced from tantalum hydride that was milled to reduce particle size and then blended with carbon. Powders were reaction hot-pressed at 1800°C for 2 hours under a flowing He environment, which resulted in ζ-Ta4C3-x that was about 99% dense. The main secondary phases present in the reacted ceramic were TaC and Ta2O5. ζ-Ta4C3-x had a thermal conductivity of 9.6 W/m·K and an electrical resistivity of 160 ± 4.2Â µΩ-cm, which are lower and higher than those of TaC, respectively. The Young's modulus was 379 ± 5 GPa and the hardness was 5.1 ± 0.7 GPa, which are also both lower than TaC. This study is the first to report the thermal properties and elastic moduli of high-purity ζ-Ta4C3-x.
E. C. Schwind et al., "Thermal Properties and Elastic Constants of ζ-Ta₄C₃₋ₓ," Journal of the American Ceramic Society, vol. 103, no. 5, pp. 2986-2990, Blackwell Publishing Inc., May 2020.
The definitive version is available at https://doi.org/10.1111/jace.16997
Materials Science and Engineering
Keywords and Phrases
Carbides; Elastic moduli; Particle size; Tantalum oxides, High purity; Secondary phasis; Thermal and elastic properties, Thermal conductivity
International Standard Serial Number (ISSN)
Article - Journal
© 2020 American Ceramic Society, All rights reserved.
01 May 2020