宽频高性能短切碳纤维/聚氨酯泡沫吸波材料制备

Study onwide-band wave-absorbing foam material prepared by shortened carbon fiber and polyurethane

采用两种不同长度的短切碳纤维做填充吸收剂制备聚氨酯硬质泡沫基复合吸波材料,使用微波矢量网络分析仪系统和弓形法测量该类复合材料的微波吸收性能,研究了两种不同长度的短切碳纤维单独应用以及复合应用时,填充质量分数、混合填充比、总填充量以及匹配层对聚氨酯泡沫吸波复合材料在8-18GHz频段吸波性能的影响.结果表明,短切碳纤维的最佳填充质量分数为7%,短切碳纤维T1和T2的最佳混合填充比为3∶4;匹配层引入可进一步改善X波段和Ku波段的宽频吸波性能,在X 波段和Ku波段可实现全频段优于-10dB 的吸波性能,峰值达-21.1dB.

The preparation of polyurethane rigid foam-based composite wave-absorbing material filling with two kinds of shortened carbon fibers with different lengths,microwave-absorbing properties of material were measured by microwave vector network analyzer measuring system and the arch method,to study the filling mass fraction,mixed filling rate and total filling amount of two kinds of shortened carbon fibers with different lengths when used alone and mixedly and the matching layer on the influence of wave-absorbing properties of polyurethane foam-based composite material in the range of 8-18 GHz. The results show that the optimum filling mass fraction of shortened carbon fibers was 7%,the best mixed filling rate of shortened carbon fibers T_1 and T_2 was 3∶ 4; the matching layer introduced to further improve wave-absorbing performance in the X-band and the Ku-band frequency ranges,the reflection loss can achieve better than- 10 d B,and the peak value was- 21. 1 d B.