【摘要】 选用高能球磨扁平化处理工艺制备的片状Fe84Si6Al10合金粉体为磁性填料,与热塑性弹性体POE混合,通过压延工艺制成柔性软磁合金电磁屏蔽片,研究了磁性合金填料的形貌、粒径以及填充量对电磁屏蔽片磁谱和电磁屏蔽性能的影响规律。结果表明,高能球磨处理能获得高扁平率Fe84Si6Al10合金片状粉末,扁平率达100;厚度<1μm的不同粒径片状磁粉对电磁屏蔽片的磁谱影响不显著;随片状Fe84Si6-Al10粉体填充量增加,电磁屏蔽片磁导率实部明显提高,磁导率虚部略有增大;当磁粉与基体的质量比为9∶1时,电磁屏蔽片在13.56 MHz的磁导率实部μ’达35.1,读写距离达33 mm,能应用于NFC系统的抗电磁干扰。更多还原

【Abstract】 The flexible electromagnetic shielding sheets based on soft magnetic Fe Si Al alloy were produced by calendering technics. The flaky Fe84Si6Al10 alloy powders prepared by the high-energy ball milling process were chosen as magnetic fillers and thermoplastic elastomer POE as matrix. Effects of the particle shape,particle size,filling amount of magnetic alloy materials on the permeability spectrum and shielding property of electromagnetic shielding sheet were investigated. The results show that the Fe84Si6Al10 alloy powders prepared by high-energy ball milling process can obtain a high flatten rate,the flatten rate was large as 100. While the thickness was less than 1μm,the influence of the flaky magnetic powders with different radial dimensions on the permeability spectrum of electromagnetic shielding sheet was not so obvious. With increase of flaky Fe84Si6Al10 powders filling amount,the real permeability of electromagnetic shielding sheet increased significantly,and the imaginary part also increased slightly. While the mass ratio of magnetic powders and matrix was 9 to1,the real permeability of electromagnetic shielding sheet reaches 35. 1 at 13. 56 MHz,and the reading /writing distance reaches 33 mm,so the electromagnetic shielding sheet can be efficiently applied to resist electromagnetic interference in NFC system.更多还原