Limitations on the use of an electric current when determining the thermal conductivity of graphite under steady thermal conditions

It is shown experimentally that the thermal conductivity of DE-24 graphite under steady thermal conditions when using an electric current as the heat source cannot be determined at a temperature higher than 3300 K. It is established that this temperature limit is due to spontaneous breakdown of the...

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Bibliographic Details
Published in:Measurement techniques 2011-10, Vol.54 (8), p.921-925
Main Authors: Kostanovskii, A. V., Kostanovskaya, M. E., Zeodinov, M. G.
Format: Article
Language:English
Subjects:
Analysis
Analytical Chemistry
Breakdown
Characterization and Evaluation of Materials
Dependence
Electric current
Electric currents
Electric power
Electrical conductivity
Graphite
Heat conductivity
Heat sources
Heat transfer
Heating
Investigations
Measurement Science and Instrumentation
Measurement techniques
Phase transitions
Physical Chemistry
Physics
Physics and Astronomy
Studies
Surface temperature
Temperature
Thermal conductivity
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Summary:It is shown experimentally that the thermal conductivity of DE-24 graphite under steady thermal conditions when using an electric current as the heat source cannot be determined at a temperature higher than 3300 K. It is established that this temperature limit is due to spontaneous breakdown of the steady thermal operating conditions, which is expressed as an increase with time of the internal surface temperature and the mean value of the electric power assigned to the high-temperature isothermal part of the hollow cylindrical sample.
ISSN:0543-1972
1573-8906
DOI:10.1007/s11018-011-9827-4