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Thermal properties and elastic constants of ζ‐Ta 4 C 3− x
Author(s) -
Schwind Evan C.,
Hilmas Gregory E.,
Fahrenholtz William G.
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16997
Subject(s) - tantalum , materials science , tantalum carbide , ceramic , thermal conductivity , elastic modulus , electrical resistivity and conductivity , carbide , analytical chemistry (journal) , max phases , phase (matter) , composite material , metallurgy , mineralogy , chemistry , organic chemistry , chromatography , electrical engineering , engineering
Thermal and elastic properties were measured for ceramics that contained as much as 96 wt% zeta phase tantalum carbide (ζ‐Ta 4 C 3− 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‐Ta 4 C 3− x that was about 99% dense. The main secondary phases present in the reacted ceramic were TaC and Ta 2 O 5 . ζ‐Ta 4 C 3− 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‐Ta 4 C 3− x .