Thermal properties and elastic constants of ζ-Ta4C3?x |
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Authors: | Evan C Schwind Gregory E Hilmas William G Fahrenholtz |
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Affiliation: | Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, MO, USA |
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Abstract: | 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 ± 4.2 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. |
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