用于电磁屏蔽的多功能CP-NiFeP/CF复合材料

Multifunctional CP-NiFeP/CF Composite for Electromagnetic interference Shielding

  • 摘要: 随着电子设备的快速发展,对电磁屏蔽材料提出了更高要求。只具有屏蔽效能的材料难以满足当前的需求,需要开发多功能电磁屏蔽材料。本研究通过在CF织物表面构建单宁酸(TA)和Fe3+(TA-Fe3+)涂层、化学镀NiFeP以及涂覆铜浆(CP)等工艺,成功制备了兼具电磁屏蔽与红外隐身性能的复合材料(CP-NiFeP/CF)。该材料通过电导损耗、磁损耗与导电网络内多次反射对入射电磁波进行衰减。当厚度为0.38 mm时,其电导率为8.79×104 S·m−1,在30-1500 MHz与8.2-12.4 GHz频段的平均EMI SE分别达到94.92 dB和111.94 dB。经2wt.% NaCl溶液浸泡、100次弯曲及5小时超声处理后,材料仍保持85 dB以上的EMI SE。此外,CP-NiFeP/CF材料还具备红外隐身。在2.5-16 μm红外波段内,材料的平均红外发射率为0.21;将其放置在200 ℃加热台上,表面温度仅为105.5 ℃。CP-NiFeP/CF复合材料在电磁防护与红外隐身领域具有广阔的应用潜力。

     

    Abstract: With the rapid development of electronic devices, the requirements for electromagnetic interference shielding materials have become increasingly rigorous. Materials that merely provide shielding performance are no longer sufficient to meet current demands, which has driven the development of multifunctional materials. In this study, we successfully prepared a composite material (CP-NiFeP/CF) that combines electromagnetic interference shielding and infrared stealth properties by first applying tannic acid (TA) and Fe3+ (TA-Fe3+) coatings to carbon fiber (CF) fabric, followed by electroplating a NiFeP layer and applying a copper paste (CP) coating. This material attenuates incident electromagnetic waves through conductive loss, magnetic loss, and multiple internal reflections within the conductive network. At a thickness of 0.38 mm, the material exhibits a conductivity of 8.79 × 104 S·m−1 and achieves an average electromagnetic interference shielding effectiveness (EMI SE) of 94.92 dB in the 30-1500 MHz frequency range and 111.94 dB in the 8.2-12.4 GHz range. After immersion in a 2wt.% NaCl solution, 100 bending cycles, and 5 hours of ultrasonic treatment, the material still maintained an EMI SE of over 85 dB. Furthermore, the CP-NiFeP/CF composite exhibits excellent infrared stealth. Its average infrared emissivity in the 2.5-16 μm band is 0.21, and when placed on a 200℃ heating stage, its surface temperature remains at only 105.5℃. These results indicate that the CP-NiFeP/CF composite holds great promise for applications in electromagnetic protection and infrared stealth.

     

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