碳纤维含量对导电涂层雷达波反射特性的影响研究

Radar Reflections Infuence Study of Different Carbon Fiber Content for Conductive Coating

目的获得不同碳纤维含量导电涂层对雷达波反射特性的影响规律,实现假目标雷达波反射特性控制。方法选择碳纤维粉为导电功能填料,丙烯酸聚氨酯树脂为粘结剂,制得碳纤维质量分数为0%~20%的导电涂料。研究碳纤维含量对涂层试板雷达波反射特性、涂层表面电阻率的影响,并在聚氨酯泡沫圆锥体构件模型上进行了试验验证。结果碳纤维质量分数从0%增加4%时,涂层表面电阻率从2.40×10^(11)?迅速降低至1.80×10~3?,雷达散射截面积(RCS)从-3.07 dBsm急剧增大至10.54 dBsm;增大到10%时,涂层表面电阻率呈波动缓慢下降的趋势,RCS缓慢增大至11.05 dBsm;继续增至20%时,涂层表面电阻率和RCS均变化很小。构件模型雷达波反射特性测试表明,碳纤维质量分数达10%时,聚氨酯泡沫圆锥体模型的表面电阻率为6.29×10~2?,0°~360°RCS达-7.12 dBsm,与贴铝膜诱饵的RCS(-6.48 dBsm)接近。结论碳纤维含量对涂层表面电阻率和雷达波反射特性的影响显著,在4%~10%为宜,在此范围内,涂层表面电阻率明显降低,呈现明显的金属化特征,雷达波反射特性与金属材料接近。

The work aims to achieve the radar reflection influence regularity of different carbon fiber content coating, and realize controlling of radar reflections properties on fake target. A series of conductive coatings with different carbon fiber mass percent for 0%-20% have been prepared by using carbon fiber powder as conductive filler and acrylic polyurethane as binder. The effect of different carbon fiber content coating for coating surface resistivity and radar reflections property of test piece has been studied, and tested on the PU foam conical modeling. The coating surface resistivity reduced quickly from 2.40 × 10^11 Ω to 1.80 × 10^3 Ω）, and the RCS increased from -3.07 dBsm to 10.54 dBsm when the carbon fiber mass percent increased from 0% to 4%; the coating surface resistivity has reduced slowly when the carbon fiber mass percent increased to 10%, and the RCS increased to 11.05 dBsm; the coating surface resistivity and RCS showed little change when the carbon fiber mass percent increased continue to 20%. The radar reflections testing results of structure modeling showed that bait RCS was closing between it coated by conductive coating and pasted by aluminum film when the carbon fiber mass percent was 10%. The coating surface resistivity and RCS was effected by the content of carbon fiber, and the best range of carbon fiber mass percent in coating was 4%-10%. In this range, the surface resistivity of coating reduced obviously, the coating showed metallic character, and the radar reflection property was closed to metal.