基于碳纳米管–碳纤维复合材料电磁兼容性能的研究

Carbon Nanotube Carbon Fiber Composites Study on the Performance of EMC

摘要: 以T700碳纤维为增强材料，环氧树脂为基体材料，制备了碳纤维复合材料电磁屏蔽体，将碳纳米管分散于环氧树脂中制得碳纳米管/环氧树脂吸波剂，把制得吸波剂喷涂到碳纤维电磁屏蔽体界面上，制得碳纳米管–碳纤维复合材料，该复合材料具有电磁兼容的性能，之后研究了它的吸波性能、力学性能、屏蔽性能以及微观形貌等。结果表明：通过控制碳纳米管/环氧树脂的比例、碳纤维的厚度可获得良好的吸波性能、力学性能、屏蔽性能的碳纳米管–碳纤维复合材料，以期实现复合材料的电磁兼容性。当碳纳米管/环氧树脂 = 6:100，碳纤维厚度为2 mm时(碳纤维布每层为0.25 mm)时，复合材料在8~12 GHz范围内，反射率 ≤ −10 dB，峰值−16.2 dB (9.98 GHz)。拉伸强度878 MPa，屏蔽效能50~70 dB (100 kHz~18 GHz)。

Abstract: The electromagnetic shielding body of carbon fiber composites was prepared by using T700 carbon fiber as reinforced material and epoxy resin as matrix material. Carbon nanotubes/epoxy resin absorbents were prepared by dispersing carbon nanotubes in epoxy resin. A carbon fiber composite material was prepared by spraying the absorbing agent on the interface of carbon fiber electromagnetic shielding. The absorbing properties, mechanical properties, shielding properties and micro morphology of the composite were studied. The results show that carbon nano-tube/carbon fiber composites with good absorbing properties, mechanical properties and shielding properties can be obtained by controlling the ratio of carbon nanotube and epoxy resin, the electromagnetic compatibility of the composites can be achieved by the carbon fiber composites. When carbon nanotube/epoxy resin = 6:100, carbon fiber thickness is 2 mm (0.25 mm per layer of carbon fiber cloth), the composite material is within the range of 8~12 GHz, the reflectance is less than −10 dB, and the peak value is −16.2 dB (9.98 GHz). The tensile strength is 878 MPa and the shielding effectiveness is 75~112 dB (100 kHz~18 GHz).