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以改性SiC短切纤维为添加剂,用热压法制备了SiCsf/LAS复合材料,考察了纤维的显微结构以及纤维和复合材料在8.2～12.4GHz频率范围内的微波介电性能。结果表明,当SiC纤维的体积分数为2.92时,纤维混合体介电常数实部、虚部最大,分别为38～25、40～20。高复介电常数的SiC纤维使SiCsf/LAS复合材料比LAS具有更高的介电常数,材料中无富碳界面层的形成。当SiC纤维的体积分数为3时,复合材料介电常数实部、虚部以及损耗角正切值最大,其均值分别为58、25和0.45。
The SiCsf / LAS composites were prepared by hot pressing with the modified SiC chopped fibers as the additive. The microstructure of the fibers and the microwave dielectric properties of the fibers and composites in the frequency range of 8.2 ~ 12.4GHz were investigated. The results show that when the volume fraction of SiC fiber is 2.92, the real part and the imaginary part of the dielectric constant of the fiber mixture are the largest, which are 38-25 and 40-20 respectively. The high dielectric constant of SiC fiber makes the SiCsf / LAS composite material have higher dielectric constant than LAS, and the material has no carbon-rich interface layer. When the volume fraction of SiC fiber is 3, the real part, the imaginary part and the tangent loss tangent of the composite dielectric constant are the largest, with the average values of 58, 25 and 0.45.