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Measurement of the heat of fusion of tantalum by a microsecond-resolution transient technique

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Abstract

The heat of fusion of tantalum was measured using a microsecond-resolution pulse-heating technique. The technique is based on rapid (about 100-μs) resistive self-heating of a specimen by a high-current pulse from a capacitor discharge system and measuring the current through the specimen, voltage across the specimen, and radiance temperature of the specimen as functions of time. Melting of a specimen is manifested by a plateau in the radiance temperature versus time function. The time integral of the power absorbed by the specimen during melting yields the heat of fusion. Measurements gave a value of 34.8 kJ · mot− for the heat of fusion of tantalum, with a total uncertainty of ±6%. Electrical resistivity of solid and liquid tantalum at its melting temperature was also measured.

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Authors and Affiliations

  1. Metallurgy Division, National Institute of Standards and Technology, 20899, Gaithersburg, Marvland, USA

    J. L. McClure & A. Cezairliyan

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  1. J. L. McClure
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  2. A. Cezairliyan
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McClure, J.L., Cezairliyan, A. Measurement of the heat of fusion of tantalum by a microsecond-resolution transient technique. Int J Thermophys 15, 505–511 (1994). https://doi.org/10.1007/BF01563710

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  • DOI: https://doi.org/10.1007/BF01563710

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