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3 mm 时,其在 X 波段内的反射率均低于－5 dB,最低为－9．9 dB,平均值为－7．8 dB。
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 permittivi-ty 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.
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