单向碳化硅纤维/环氧树脂复合材料吸波性能的研究

Study on the microwave absorption properties of SiC_f/epoxy composite

采用真空袋工艺制备了纤维体积分数为10%-40%的单向碳化硅纤维/环氧树脂复合材料,研究其力学性能和介电性能,计算其吸波性能和反射率.结果表明,在10%-25%范围内,随着碳化硅纤维体积分数的提高,复合材料的介电损耗实部、虚部及损耗角正切值均增大,反射率减少,即吸波能力增大;而在高于25%之后,就吸波能力而言,存在着最优纤维体积分数值;在纤维体积分数固定之后,就吸波能力而言,也存在着最佳的材料厚度;当复合材料的SiC纤维体积分数为25%、厚度为3mm 时,其在X 波段内的反射率均低于-5dB,最低为-9.9dB,平均值为-7.8dB.

The SiCf/resin composites with different fiber content(10%-40%)are prepared to study the dielectric and microwave absorption properties.The results show that with the addition of SiC fibers,both the permittivity and tangent loss of the composites are increased when the fiber content ranges from 10%-25%.When the content of fiber was 25%,and the sample thickness was 3 mm,the average reflection loss in X band was-7.81 dB which was an appropriate value for dielectric medium to absorb microwaves.