Thermophysical properties by a pulse-heating reflectometric technique: Niobium, 1100 to 2700 K

Year: 1999

Authors: Righini F., Spisiak J., Bussolino GC., Gualano M.

Autors Affiliation: CNR, Inst Metrol G Colonnetti, I-10135 Turin, Italy;
Slovak Acad Sci, Inst Phys, Bratislava, Slovakia

Abstract: Pulse-heating experiments were performed on niobium strips, taking the specimens from room temperature to the melting point is less than one second. The normal spectral emissivity of the strips was measured by integrating sphere I reflectometry, and, simultaneously, experimental data (radiance temperature. cur rent, voltage drop) for thermophysical properties were collected with submillisecond time resolution. The normal spectral emissivity results were used to compute the true temperature of the niobium strips; the heat capacity, electrical resistivity, and hemispherical total emissivity were evaluated in the temperature range 1100 to 2700 K. The results are compared with literature data obtained in pulse-heating experiments. It is concluded that combined measurements of normal spectral emissivity and of thermophysical properties on strip specimens provide results of the same quality as obtained using tubular specimens with a blackbody. The thermophysical property results on niobium also validate the normal spectral emissivity measurements by integrating sphere reflectometry.

Journal/Review: INTERNATIONAL JOURNAL OF THERMOPHYSICS

Volume: 20 (4)      Pages from: 1107  to: 1116

More Information: Vedecká Grantová Agentúra MŠVVaŠ SR a SAV, VEGA, 2/5084/98. – One of the authors (J.S.) gratefully acknowledges the financial support received from the Slovak Grant Agency (VEGA) under Contract 2/5084/98. – Commissariat a l
KeyWords: electrical resistivity; heat capacity; hemispherical total emissivity; high temperatures; niobium;
DOI: 10.1023/A:1022654804141

Citations: 21
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