Thermal Properties of Carbon Fiber Reinforced Mullite Composites Derived from Sol-Gel
| Autor: | Song Lin Liang, Kuan Hong Zeng, Zhong Quan Li, Qing Song Ma, Xiao Feng Lv |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Sintering Mullite 02 engineering and technology 021001 nanoscience & nanotechnology Thermal diffusivity 01 natural sciences Heat capacity Thermal expansion Thermal conductivity Mechanics of Materials 0103 physical sciences Thermal General Materials Science Composite material 0210 nano-technology Sol-gel |
| Zdroj: | Key Engineering Materials. 727:461-465 |
| ISSN: | 1662-9795 |
| DOI: | 10.4028/www.scientific.net/kem.727.461 |
| Popis: | Mullite matrix composites with laminated and stitched carbon fiber cloth preform as reinforcement were fabricated via the route of “infiltration-drying-heat treatment” using Al2O3-SiO2 sol as raw materials. Thermal properties from room temperature to 1673K of the composites were investigated. The coefficient of thermal expansion (CTE) increases first and then decreases, and reaches a maximum of 4.83×10-6K-1 at 1273K. As a result of the further sintering of matrix, the CTE is negative at above 1300°C. The specific heat capacity increases to the maximum of 1.547J·g-1·K-1 at 1473K and remains stable at above 1473K, with a minimum of 0.756J·g-1·K-1 at room temperature. The thermal diffusivity decreases from 1.1mm2·s-1 at room temperature to 0.707 mm2·s-1 at 973K as the temperature was elevated, and remains stable at above 973K. On the contrary, the thermal conductivity is improved with increasing temperature on the whole and varies from 1.859W·m-1·K-1 at room temperature to 2.325W·m-1·K-1 at 1473K. |
| Databáze: | OpenAIRE |
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