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<p>Nowadays, due to the increasing integration, miniaturization, and multi-functionality of electronic devices, the demand for electromagnetic (EM) absorbing materials requires not only high absorption properties, but also excellent thermal conductivity. In this study, the Ni-coated graphite (filler)/carbonyl iron powders (CIP) absorbing composites were successfully prepared by electroless plating and ultrasonic mixing technology. The phases and microstructure of composites were analyzed by x-ray diffraction (XRD) and scanning electron microscope (SEM). The EM property of composites was characterized by means of vibrating sample magnetometer (VSM). The electromagnetic (EM) parameters were determined by vector network analyzer. The thermal conductivity of the composites was measured by the quick thermal conductivity meter. The thermal conductivity of Ni-coated graphite/CIP composites (1&#xa0;wt%) is 3.03 W/m·K, which is 14% higher than that of CIP (2.66&#xa0;W/m⋅K). With the thickness of 2.0&#xa0;mm, the minimum reflection loss (RL<sub>min</sub>) for Ni-coated graphite/CIP composites (1&#xa0;wt%) reached − 16&#xa0;dB at 2.4&#xa0;GHz, and the effective absorption bandwidth (EAB) reaches 1.04&#xa0;GHz (RL &lt; − 10&#xa0;dB). However, when the content of filler is 5&#xa0;wt%, the thermal conductivity of the composites reaches 4.2 W/(m·K) with the value of RL<sub>min</sub> still lower than − 10&#xa0;dB. The result shows that the high thermal conductivity and excellent absorption properties can be achieved simultaneously by adjusting the filler content and the thickness. The Ni-coated graphite/CIP composites exhibit considerable potential as dual-functional materials (absorbing and thermal conductivity) in the S-band.</p>

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Study on the Ni-Coated Graphite/CIP Thermal Conductivity Absorbing Composites

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Yaqi Li,
  • Guozhi Xie,
  • Zekai Li,
  • Jing Chen

摘要

Nowadays, due to the increasing integration, miniaturization, and multi-functionality of electronic devices, the demand for electromagnetic (EM) absorbing materials requires not only high absorption properties, but also excellent thermal conductivity. In this study, the Ni-coated graphite (filler)/carbonyl iron powders (CIP) absorbing composites were successfully prepared by electroless plating and ultrasonic mixing technology. The phases and microstructure of composites were analyzed by x-ray diffraction (XRD) and scanning electron microscope (SEM). The EM property of composites was characterized by means of vibrating sample magnetometer (VSM). The electromagnetic (EM) parameters were determined by vector network analyzer. The thermal conductivity of the composites was measured by the quick thermal conductivity meter. The thermal conductivity of Ni-coated graphite/CIP composites (1 wt%) is 3.03 W/m·K, which is 14% higher than that of CIP (2.66 W/m⋅K). With the thickness of 2.0 mm, the minimum reflection loss (RLmin) for Ni-coated graphite/CIP composites (1 wt%) reached − 16 dB at 2.4 GHz, and the effective absorption bandwidth (EAB) reaches 1.04 GHz (RL < − 10 dB). However, when the content of filler is 5 wt%, the thermal conductivity of the composites reaches 4.2 W/(m·K) with the value of RLmin still lower than − 10 dB. The result shows that the high thermal conductivity and excellent absorption properties can be achieved simultaneously by adjusting the filler content and the thickness. The Ni-coated graphite/CIP composites exhibit considerable potential as dual-functional materials (absorbing and thermal conductivity) in the S-band.