RADIATION ENERGY TRANSFER AND THERMAL CONDUCTIVITY OF CERAMIC OXIDES

Journal Article · Tue Nov 01 04:00:00 EST 1960 · Journal of the American Ceramic Society (U.S.)

DOI:https://doi.org/10.1111/j.1151-2916.1960.tb13623.x· OSTI ID:4120800

Lee, D W; Kingery, W D

The heat-transfer mechanisms in several ceramic oxides were investigated from room temperature to 1250/sup o/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. (auth)

• Research Organization: Massachusetts Inst. of Tech., Cambridge
• Sponsoring Organization: USDOE
• NSA Number: NSA-15-003120
• OSTI ID: 4120800
• Journal Information: Journal of the American Ceramic Society (U.S.), Journal Name: Journal of the American Ceramic Society (U.S.) Vol. Vol: 43; ISSN JACTA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CERAMICS
CRYSTALS
GLASS
HEAT TRANSFER
HIGH TEMPERATURE
IMPURITIES
INFRARED RADIATION
LATTICES
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
OXIDES
POROSITY
SOUND
TEMPERATURE
THERMAL CONDUCTIVITY