Thermophysical properties of tantalum carbide (TaC) within 2000–5500 K temperature range

Investigation of the tantalum carbide physical properties at temperatures ranging from 2000 to 5500 K during rapid current pulse heating were carried out. The experimental results were obtained on the 150 μm thick lamellas cut from the Spark Plasma Sintered bulk samples with a TaC0,9 composition. Th...

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Bibliographic Details
Published in:	Ceramics international Vol. 48; no. 14; pp. 19655 - 19661
Main Authors:	Savvatimskiy, A.I., Onufriev, S.V., Valyano, G.V., Nepapushev, A.A., Moskovskikh, D.O.
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 15-07-2022
Subjects:	Carbide Enthalpy Heat of melting Pulse electrical heating Specific heat TaC Carbide Specific heat Heat of melting Pulse electrical heating Enthalpy TaC
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Summary:	Investigation of the tantalum carbide physical properties at temperatures ranging from 2000 to 5500 K during rapid current pulse heating were carried out. The experimental results were obtained on the 150 μm thick lamellas cut from the Spark Plasma Sintered bulk samples with a TaC0,9 composition. The conducted experiments showed that carbide of this composition melts in a narrow temperature range of 4100–4300 K. Measured enthalpies at the beginning (Hsol) and at the end of melting (Hliq) were 1.55 kJ/g and 2.1 kJ/g respectively. Specific heat Cp and electrical resistance ρ were also determined experimentally depending on temperature for the solid and liquid state of the tantalum carbide. For the solid state at T = 2500 K Cp and ρ values were 0.4 J/gK and ∼280–290 μΩ•cm respectively. A sharp increase of the Cp at the vicinity of melting was found, possible reasons of which were considered. The data for the liquid phase were obtained for the first time.
ISSN:	0272-8842 1873-3956
DOI:	10.1016/j.ceramint.2022.03.102