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Fabrication of a Guarded-Hot-Plate Apparatus for Use Over an Extended Temperature Range and in a Controlled Gas Atmosphere.


pdf icon Fabrication of a Guarded-Hot-Plate Apparatus for Use Over an Extended Temperature Range and in a Controlled Gas Atmosphere. (1336 K)
Zarr, R. R.; Flynn, D. R.; Hettenhouser, J. W.; Brandenburg, N. J.; Healy, W. M.

International Thermal Conductivity 28th Conference/International Thermal Expansion 16th Symposium. Proceedings. June 26-29, 2005, New Brunswick, Canada, DEStech Publications, Inc., Dinwiddie, R.; White, M. A.; McElroy, D. L., Editor(s)(s), 235-245 pp, 2005.

Sponsor:

DOE Office of Industrial Technology

Keywords:

guarded-hot-plate apparatus; insulation; temperature range; gas atmosphere; transmission; equipment; thermometers; thermocouples; thermopile; calibrating; vaccum chambers

Abstract:

This paper describes a guarded-hot-plate apparatus suitable for determining the steady-state thermal transmission properties of insulation specimens from 90 K to 900 K in a controlled gas atmosphere from 10-5 kPa to 105 kPa. The apparatus accommodates flat-slab specimens 500 mm in diameter and from 13 mm to 100 mm in thickness. Fabrication and assembly details are presented for the apparatus hot and cold plates, guard system surrounding the plates, temperature sensors, metal-sheathed heaters, and vacuum/gas pressurization system. An initial assessment of the calibration uncertainties for the primary measurement sensors is presented.