中文摘要：

采用热压烧结法制备了不同纤维长度的SiCsf／LAS玻璃陶瓷复合材料，研究了该复合材料的微观结构、力学性能和在8．2～12．4GHz频率范围内的微波介电性能。结果表明：SiC纤维体积含量为1％时，随着SiC纤维长度的增加，SiCsf／LAS材料的抗弯强度先增加后降低。由于碳界面层的形成，SiCsf／LAS材料要比LAS材料具有更高的介电常数和损耗。当SiC短纤维的长度为4mm时，SiCsf／LAS复合材料的复介电常数具有最大的频散效应，分析认为这与碳界面层在复合材料中形成的电偶极子有关。

英文摘要：

The SiCsf/LAS glass ceramic composites with different length of SiC fibre are prepared by hot-press sintering. The microstructure, mechanical and microwave dielectric properties of the composites in the frequency range of 8. 2-12. 4GHz are investigated. Results show that the flexural strength of composites increases and sequentially decreases with the increasing length of SiC fibre when the content of volume is 1 %. Because of the presence of carbon interface between the fibre and matrix, high real and imaginary parts of the permittivities of the composites are obtained. When the fibre is 4mm long, the real and imaginary parts get maximum values and both show strongest frequency dependence. It is believed that they are related to the formation of electric dipole come from carbon interface.