Thermal diffusivity/conductivity of magnesium oxide/silicon carbide composites

Journal Article · Sat Mar 01 04:00:00 EST 1997 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1997.tb02887.x· OSTI ID:474151

Luo, J; Stevens, R ^[1]; Taylor, R ^[2]

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1. Univ. of Bath (United Kingdom). School of Materials Science
2. Univ. of Manchester Inst. of Science and Technology (United Kingdom). Dept. of Materials

SiC-particle-reinforced MgO composites have been fabricated by hot pressing, and the thermal diffusivities of the composites measured in the temperature range 200--1,000 C using a laser flash technique. The thermal conductivity of the composites was calculated by multiplying the diffusivity with density and with heat capacity. The Eshelby inclusion model has been examined, and an equation suitable for particulate composites with porosity has been derived using the multiphase Eshelby model. The model also considers the interfacial thermal condition. Good agreement was obtained between the predictions and the experimental results of the thermal conductivity of the composites, even for various levels of porosity in the composites. Crystal defects, observed in the composites, influenced the thermal conductivity, resulting in a deviation from isothermal interfacial condition. This was reflected in the interfacial thermal parameter, {beta}, used in the modeling, and the predicted value of {beta} was in the range of 3--10, depending on the thermal conductivity of SiC used for the calculations.

• Sponsoring Organization: USDOE
• OSTI ID: 474151
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 3 Vol. 80; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BULK DENSITY
COMPOSITE MATERIALS
CRYSTAL DEFECTS
HOT PRESSING
MAGNESIUM OXIDES
MATHEMATICAL MODELS
SILICON CARBIDES
THERMAL CONDUCTIVITY
THERMAL DIFFUSIVITY
VALIDATION