摘要
The thermal expansion coefficient and the thermal diffusivity of 2 dimensional (D), 2.5D and 3D carbon fiber reinforced silicon carbide (C/SiC) composites were tested from room temperature to 1400°C using a thermal dilatometer and laser flash apparatus. The microstructure was observed by scanning electron microscopy and light microscopy. The results show that at low temperature (below 700°C), the longitudinal and transversal thermal expansion coefficients of all these C/SiC composites increase slowly as the temperature increases, followed by fluctuations of different degrees after 700°C. At high temperature above 700°C, the longitudinal thermal expansion coefficients of all these materials and the transversal coefficient of the 2D C/SiC composite decrease as the temperature increases, but the transversal thermal expansion coefficients of the 2.5D and 3D C/SiC composites increase sharply as the temperature increases. The thermal diffusivity of all these composites decreases as the temperature increases, and the thermal diffusivity of the 3D C/SiC composite is the highest, it is 1-1.2 and 1.4-2 times higher than the 2.5D and 2D C/SiC composites respectively.
源语言 | 英语 |
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页(从-至) | 1564-1569+1576 |
期刊 | Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society |
卷 | 36 |
期 | 11 |
出版状态 | 已出版 - 11月 2008 |