Technique for determining thermal and electrical conductivity and absolute Seebeck coefficient between 300 and 1000 K
Abstract
A guarded longitudinal-heat-flow technique for measuring thermal conductivity, electrical resistivity, and Seebeck coefficient on small rods between 300 and 1000 K is described. The thermal conductivity of the powder insulation in the system annuli was low enough to permit use of the thin-rod approximation for calculating the thermal conductivity of metals. The apparatus was tested with an Armco iron reference specimen. One test was performed with the specimen brazed onto heater and heat sink, and results from this test were within the determinate error. Measurements on the reference specimen when it was threaded onto heater and heat sink produced electrical resistivity and Seebeck coefficient results that agreed with those from the brazed specimen to within determinate error but produced thermal conductivity results that were 2 to 6% above the reference values.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- September 1974
- Bibcode:
- 1974STIN...7519640M
- Keywords:
-
- Electrical Resistivity;
- Heat Transmission;
- Seebeck Effect;
- Thermal Conductivity;
- Metals;
- Thermal Analysis;
- Thermodynamic Properties;
- Instrumentation and Photography