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Research And Development On Advanced Graphite Materials. Volume XXI - Carbon Arc Image Furnace Studies Of Graphite

Report Number: WADD TR 61-72 Volume 21
Author(s): M. R. Null and W. W. Lozier
Corporate Author: Research Laboratory, National Carbon Company, Division of Union Carbide Corporation
Laboratory: AF Materials Laboratory
Date of Publication: 1963-11
Pages: 64
Contract: AF 33(616)-6915
Project: 7350
Task: 735002
AD Number: AD0426665

Abstract:
Measurements obtained using a carbon arc image furnace indicate that the spectral reflectance and emissivity of carbon and graphite samples in the visible region of the spectrum are strongly dependent on surface finish, but are independent of temperature to at least 3000°K, regard less of surface finish. Discrepancies with other measurements of emissivity are indicated to be caused by errors in the measurement of surface temperature, due to thermal gradients.

Information has been obtained with the carbon arc image furnace indicating that the thermal conductivity of surface material depends strongly on surface finish and is smaller than the conductivity of substrate material.

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