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

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 reflectometry, and, simultaneously, experimental data (radiance tempera...

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Bibliographic Details
Published inInternational journal of thermophysics Vol. 20; no. 4; pp. 1107 - 1116
Main Authors RIGHINI, F, SPISIAK, J, BUSSOLINO, G. C, GUALANO, M
Format Conference Proceeding Journal Article
LanguageEnglish
Published New York, NY Springer 01.07.1999
Subjects
Applied sciences
COMPARATIVE EVALUATIONS
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
ELECTRIC CONDUCTIVITY
Electric conductivity of liquids
Electrical and thermal conduction in crystalline metals and alloys
Electronic conduction in metals and alloys
Electronic transport in condensed matter
EMISSIVITY
Exact sciences and technology
Heat capacities of solids
Heating
High temperature effects
MATERIALS SCIENCE
MEASURING METHODS
Metal melting
Metals. Metallurgy
NIOBIUM
Other topics in nonelectronic transport properties of condensed matter
Other topics in nonelectronictransport properties of condensed matter
Physics
SPECIFIC HEAT
Specific heat of liquids
TEMPERATURE RANGE 1000-4000 K
Thermal properties of condensed matter
Thermal properties of crystalline solids
Transport properties of condensed matter (nonelectronic)
Specific heat
Pulse techniques
Emissivity
Electrical conductivity
Transition elements
Reflectometry
Pulse heating
Experimental study
Thermophysical properties
Niobium
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Summary: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 reflectometry, and, simultaneously, experimental data (radiance temperature, current, voltage drop) for thermophysical properties were collected with sub-millisecond 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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-2
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SourceType-Conference Papers & Proceedings-1
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ISSN:0195-928X
1572-9567
DOI:10.1023/A:1022654804141