FeSiAl抗电磁干扰柔性软磁薄膜的研究
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摘要
扁平FeSiAl磁粉先后经过硅烷偶联剂表面包覆、粘结剂涂覆成型、热压成型等处理后得到FeSiAl抗电磁干扰用软磁薄膜。然后使用扫描电镜、磁导率测试仪测试样品的微观形貌和磁导率。结果表明:使用硅烷偶联剂KH-550处理柔性薄膜用的金属粉体,能够使胶粘剂与金属粉体结合牢固、粉体表面包覆完整;采用3%~5%(质量分数)环氧树脂胶粘剂和10%~12%(质量分数)聚氨酯胶粘剂双胶粘剂制备得到的FeSiAl薄膜平整性、柔韧性、密度和磁导率都比较好;在平板硫化机中180℃温度下热压5min后,得到0.5mm的薄膜,其柔韧性较好,密度ρ最高(3.2g/cm3),磁导率μ′也较高(125H/m),反射损耗在2.8GHz频率下达到最低值-14.2dB,-10dB(90%吸收率)带宽可达2.12GHz。由于具有高磁导率的材料可以容易地进行阻抗匹配,故该FeSiAl柔性薄膜可用作特殊抗电磁干扰材料。
The FeSiAl soft magnetic film of anti-electromagnetic interference is obtained after the flat FeSiAl magnetic powder treated by the surface coating of silane coupling agent,adhesive coating molding,hot pressing,etc.,then its microstructure and permeability are measured by scanning electron microscopy,permeability tester,respectively.The experimental results showed that the use of silane coupling agent KH-550 to treat the metal powder used in the soft film can make the adhesive bonded firmly to the metal powder and can coat the surface of the powder totally.The flatness,flexibility,density and magnetic permeability of FeSiAl films prepared by using 3%-5%(mass fraction)epoxy resin adhesive and 10%-12%(mass fraction)polyurethane adhesive are better.The thin film of0.5 mm is hot-pressed 5 min at 180℃in the flat vulcanizing machine,in which the flexibility is better,the density is the highest(3.2 g/cm3),the permeability is relatively high(125 H/m),the reflection loss reaches the minimum value of-14.2 dB at 2.8 GHz frequency,and the bandwidth of-10 dB(90% absorptivity)reaches 2.12 GHz.Since the high permeability materials can be easily performed impedance matching,the FeSiAl soft film can be used as special anti-electromagnetic interference materials.
The FeSiAl soft magnetic film of anti-electromagnetic interference is obtained after the flat FeSiAl magnetic powder treated by the surface coating of silane coupling agent,adhesive coating molding,hot pressing,etc.,then its microstructure and permeability are measured by scanning electron microscopy,permeability tester,respectively.The experimental results showed that the use of silane coupling agent KH-550 to treat the metal powder used in the soft film can make the adhesive bonded firmly to the metal powder and can coat the surface of the powder totally.The flatness,flexibility,density and magnetic permeability of FeSiAl films prepared by using 3%-5%(mass fraction)epoxy resin adhesive and 10%-12%(mass fraction)polyurethane adhesive are better.The thin film of0.5 mm is hot-pressed 5 min at 180℃in the flat vulcanizing machine,in which the flexibility is better,the density is the highest(3.2 g/cm3),the permeability is relatively high(125 H/m),the reflection loss reaches the minimum value of-14.2 dB at 2.8 GHz frequency,and the bandwidth of-10 dB(90% absorptivity)reaches 2.12 GHz.Since the high permeability materials can be easily performed impedance matching,the FeSiAl soft film can be used as special anti-electromagnetic interference materials.
引文
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[4]张伟,刘天成,朱景森,等.退火热处理对扁平状Fe-Si-Al磁粉电磁性能的影响[J].金属功能材料,2016,23(1):21.
[5]赵仁富,刘尧,冯则坤.扁平化金属合金微粉Fe-Si-Al的制备及电磁特性研究[J].金属功能材料,2006,13(4):4.
[6]Samuels L E,Holmes E C,Garwood P,et al.Initial experience with the abiomed AB5000ventricular assist device system[J].Annals of Thoracic Surgery,2005,80(1):309.
[7]Awakura Y,Abe Y,Suzuki Y,et al.Development of an environmentally fiendly noise suppression sheet-halogen-free FLEX suppressor[J].Nec Technical Journal,2007,2(4):71.
[8]赵海燕,虞维扬,姚中.FeSiAl合金薄膜电感的研制与研究[J].金属功能材料,2001,8(3):17.
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