Thermal Properties of Carbon Fiber Reinforced Mullite Composites Derived from Sol-Gel

Abstract:

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.

• Periodical: Key Engineering Materials (Volume 727)
• Pages: 461-465
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.727.461
• Online since: January 2017
• Authors: Kuan Hong Zeng, Zhong Quan Li, Song Lin Liang, Xiao Lv, Qing Song Ma
• Keywords: Mullite Composites, Sol-Gel, Thermal Properties

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