脉冲磁场幅值对制备聚硅氧烷复合材料的电磁屏蔽性能影响规律  

Effect of Pulse Magnetic Field Amplitude on Electromagnetic Shielding Performance of Polysiloxane Composites

作　　者：米彦[1] 刘灿辉 朱亚奎 陈勇 李政民 MI Yan;LIU Canhui;ZHU Yakui;CHEN Yong;LI Zhengmin(State Key Laboratory of Power Transmission Equipment Technology,School of Electrical Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]输变电装备技术全国重点实验室(重庆大学电气工程学院),重庆400044

出　　处：《高电压技术》2024年第7期3249-3257,共9页High Voltage Engineering

摘　　要：脉冲磁场已被证实通过诱导纳米粒子在基体中取向排列可以显著提高复合材料的电磁屏蔽性能,然而脉冲磁场幅值对复合材料电磁屏蔽性能的影响规律尚不明确。因此,采用脉宽为10μs、频率为50Hz的脉冲磁场诱导片状羰基铁(flaky carbonyl iron,FCI)在聚二甲基硅氧烷(polydimethylsiloxane,PDMS)中定向排列,研究磁场幅值(0~0.7T)对复合材料电磁屏蔽性能的影响规律。用扫描电子显微镜(scanning electron microscope,SEM)和X射线衍射(X-ray diffraction,XRD)对纳米粒子的取向和排列进行了表征。结果表明,脉冲磁场可以有效控制羰基铁的取向和排列,形成导电网络结构,提高复合材料的导电性,最终显著提高取向复合材料的电磁屏蔽性能。脉冲磁场对复合材料的屏蔽效能增强效果可达27%,达到的最高屏蔽效率为15.36dB。理论分析和实验结果的一致性证实了微秒级脉冲磁场在改善复合材料电磁屏蔽性能方面的有效性。该研究制备的高性能柔性电磁屏蔽复合材料具有应用于先进电子设备的潜力。It has been proved that pulsed magnetic fields can significantly improve the electromagnetic shielding per-formance of composite materials by inducing the orientation of nanoparticles in the matrix.However,the influence of pulsed magnetic field amplitude on the electromagnetic shielding performance of composite materials is still unclear.Therefore,a pulsed magnetic field with a pulse width of 10μs and a frequency of 50 Hz was used to induce the oriented arrangement of flaky carbonyl iron(FCI)in polydimethylsiloxane(PDMS).The influence of magnetic field amplitude(0~0.7 T)on the electromagnetic shielding performance of composite materials was studied.The orientation and ar-rangement of the nanoparticles were characterized by scanning electron microscope(SEM)and X-ray diffraction(XRD).The results show that the pulsed magnetic field can effectively control the orientation and arrangement of carbonyl iron,form a conductive network structure,improve the conductivity of the composite,and finally significantly improve the electromagnetic shielding performance of the oriented composite.The shielding effect of the pulsed magnetic field on the composite can reach 27%,and the highest shielding efficiency is 15.36 dB.The agreement between theoretical analysis and experimental results confirms the effectiveness of a microsecond pulsed magnetic field in improving the electromag-netic shielding performance of composite materials.The high-performance flexible electromagnetic shielding composite prepared in this study has the potential to be applied in advanced electronic devices.

关 键 词：微秒脉冲磁场 取向 聚硅氧烷 羰基铁 电磁屏蔽 

分 类 号：TB332[一般工业技术—材料科学与工程]