纤维表面绝缘处理对含碳纤维非织造布雷达波吸收性能的影响

利用碳纤维和普通纺织纤维混纺,可以制作具有良好雷达波吸收性能的非织造布。探讨了对非织造布中的纤维进行绝缘处理对非织造布雷达波吸收性能的影响规律。实验中使用羊毛纤维、沥青基碳纤维和双组分热熔粘合纤维,通过粗梳毛纺成网工艺和热风法工艺制作了对雷达波有一定吸收能力的非织造布;采用氨基改性聚硅氧烷对非织造布中的纤维进行了表面绝缘处理。利用专用的雷达吸波材料反射率测试装置测试了不同碳纤维含量非织造布的雷达波反射率,并在8~18GHz频率范围内比较了纤维表面处理对非织造布雷达波吸收性能的影响。结果表明,纤维表面绝缘处理会在一定程度上提高非织造布的雷达波吸收能力,但是绝缘处理造成的影响随着非织造布中碳纤维含量的减少而逐渐降低并趋于消失。

Investigation on the effect of surface insulation process of the fiber on radar reflectivity of carbon fiber-loaded nonwovens

Nonwovens with radar absorbing capabilities can be fabricated by blending carbon fiber and common textile fibers.Effect of surface insulation process of the fiber on radar absorbing capability of carbon fiber-loaded nonwovens was investigated in this paper.The nonwovens with wool,pitch-based carbon fiber and heat-bondable bicomponent fiber by woolen carding process and through-air thermo-bonding process were fabricated in experiment.Fibers in the nonwoven were insulated with polyorganosiloxane microemulsion.Reflectivity of the insulated and noninsulated nonwovens with different carbon fiber contents were tested and comparatively investigated by the special installations in the frequency range of 8～18 GHz.The results indicated that the insulation process indeed increased the radar absorbing capacity of the nonwovens to a certain extent.However,the improvement of the radar absorbing capacity by insulation process diminished with the decrease of carbon fiber content in the nonwoven.