Thermal Diffusivity/Conductivity and Specific Heat of Mullite-Zirconia-Silicon Carbide Whisker Composites |
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| Authors: | Laura M Russell Kimberly Y Donaldson&#; D P H Hasselman&#; Robert Ruh † Jane W Adams ‡ |
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| Affiliation: | Thermophysical Research Laboratory, Department of Materials Science and Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061–0237;Wright Laboratory, Wright-Patterson Air Force Base, Ohio 45433-7602;Corning Incorporated, Corning, New York 14831 |
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| Abstract: | The thermal diffusivity of mullite-ZrO2-SiCw materials was determined from 25° to 1000°C for composites in which the ZrO2 had different amounts of monoclinic and tetragonal phase, and varying SiC w content. At 25°C the thermal diffusivity of the matrix materials increased with increasing amounts of monoclinic phase, and little or no anisotropy was seen. Composites with SiC w additions showed significant increases in thermal diffusivity and anisotropy as compared with the matrix materials. With increasing temperature, thermal diffusivities of the matrices and their respective composites decreased, and at 1000°C differences were small. Specific heat was determined from 25° to 700°C and thermal conductivity values calculated. Specific heat increased with temperature and was not composition dependent, except for one sample. Thermal conductivity values as a function of temperature followed the same trends as the thermal diffusivity values. |
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