共混树脂包覆铁基磁粉芯的制备与性能  

Preparation and properties of iron based soft magnetic composites coated with mixed resin

作　　者：余红雅 李开沥[2,3] 黎向东 刘仲武 郭宝春[1,2,3] 李竞舟 YU Hongya;LI Kaili;LI Xiangdong;LIU Zhongwu;GUO Baochun;LI Jingzhou(Dongguan Mentech Optical&Magnetic CO.,LTD.,Dongguan 523330,China;School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China;South China Institute of Collaborative Innovation,Dongguan 523808,China)

机构地区：[1]东莞铭普光磁股份有限公司,东莞523330 [2]华南理工大学材料科学与工程学院,广州510640 [3]华南协同创新研究院,东莞523808

出　　处：《复合材料学报》2024年第1期315-322,共8页Acta Materiae Compositae Sinica

基　　金：东莞市引进创新科研团队项目(2020607231010);广东省自然科学基金面上项目(2021A1515012464)。

摘　　要：随着移动通讯、智能制造、汽车电子与电子新能源等新兴领域的快速发展,对磁粉芯的损耗及其他方面的性能提出了更高的要求。将环氧树脂与有机硅树脂进行共混改性,并对磷化处理后的羰基铁粉进行有机绝缘包覆,再对包覆后的磁粉进行压制成型及固化处理制备成铁基磁粉芯(SMCs)。研究了不同成分共混树脂对铁基磁粉芯组织结构与电磁学性能的影响。结果表明,共混树脂通过形成有效的包覆层结构,减少粉末颗粒在压制过程所引入的应变,同时隔离颗粒间的接触以切断涡流,使所制备的磁粉芯密度达到6.82 g/cm^(3)、电阻率高达1.1×10^(6)Ω·cm,并提高了品质因数,降低了高频损耗。当共混树脂由33.3wt%环氧树脂与66.7wt%有机硅树脂组成时,铁基磁粉芯的综合性能最佳,在200 kHz下的功率损耗仅为1182.7 kW/m^(3)。通过选用合适成分的共混树脂包覆剂,进一步优化铁基磁粉芯的磁性能,在中高频领域具有广阔的应用前景。With the rapid development of mobile communication,intelligent manufacturing,automotive electronics,electronic new energy and other emerging fields,reducing the magnetic loss and improving other properties of SMCs are required.The silicone resin mixed with epoxy resin was used to coat the phosphatized carbonyl iron powder(CIP).And the coated powders were fabricated into iron based soft magnetic composites(SMCs)through compression and curing.The effects of different mixed resins on the microstructure and electromagnetic properties of iron-based SMCs were studied.The results show that the mixed resin has been formed a reasonable coating layer on the surface of powders,which leads to reduce the strain of the powders introduced during compression and isolate the powders to cut off the eddy current.As a result,the density of SMCs can reach 6.82 g/cm^(3),the resistivity is as high as 1.1×10^(6)Ω·cm.Meanwhile,its quality factor is improved and the magnetic loss at high frequency is reduced.When the mixed resin is composed of 33.3wt%epoxy resin and 66.7wt%silicone resin,the SMCs are provided with optimal comprehensive performance with 1182.7 kW/m^(3) loss only at 200 kHz.The magnetic properties of iron-based SMCs are further optimized through selecting the blending resin coating agent with suitable composition,which has a broad application prospect in the field of medium and high frequency.

关 键 词：磁粉芯 共混树脂 绝缘包覆 磁损耗 品质因数 

分 类 号：TB333[一般工业技术—材料科学与工程]