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Radiation Energy Transfer and Thermal Conductivity of Ceramic Oxides
Author(s) -
LEE D. W.,
KINGERY W. D.
Publication year - 1960
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1960.tb13623.x
Subject(s) - thermal conduction , materials science , thermal conductivity , ceramic , crystallite , heat transfer , phonon , porosity , conductivity , condensed matter physics , mineralogy , composite material , thermodynamics , chemistry , metallurgy , physics
The heat‐transfer mechanisms in several ceramic oxides have been investigated from room temperature to 1250°C. The conductivity of normal sintered porous polycrystalline oxides results from phonon conduction, and results agree with theoretical expectations for the effect of impurities, structure, and temperature dependence. Single crystals, glasses, and low‐porosity aggregates show deviations from the expected phonon conduction which are attributed to a second mechanism of heat transfer, namely, photon conduction. Measurements of photon conduction are related to infrared transmission, structure, and conditions of the measurements. Photon conduction can be a significant portion of the total heat conduction at high temperatures; however, for normal polycrystalline ceramic oxides of porosities greater than 2%, this contribution is small.