聚酰亚胺添加量对铁粉芯微观结构及磁性能的影响  

Effects of polyimide content on the microstructure and magnetic properties of iron powder cores

作　　者：李冠彪 章争荣[1] 刘辛 王健 贺弋海 杨晟 田梦园 LI Guan-biao;ZHANG Zheng-rong;LIU Xin;WANG Jian;HE Yi-hai;YANG Sheng;TIAN Meng-yuan(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China;Institute of New Materials,Guangdong Academy of Sciences,National Engineering Research Center of Powder Metallurgy of Titanium&Rare Metals,Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application,Guangzhou,510651,China)

机构地区：[1]广东工业大学材料与能源学院,广东广州510006 [2]广东省科学院新材料研究所,国家钛及稀有金属粉末冶金工程技术研究中心,广东省金属强韧化技术与应用重点实验室,广东广州510651

出　　处：《磁性材料及器件》2023年第6期50-55,共6页Journal of Magnetic Materials and Devices

基　　金：广东省国际合作项目(2022A0505050050);广州市基础与应用基础研究项目(202102020940);江门市省科技创新战略专项资金(“大专项+任务清单”)项目(江科[2021]182号);深圳市技术攻关面上项目(JSGG20210802153810031);广东省科学院建设国内一流研究机构行动专项资金项目(2021GDASYL-20210103098)。

摘　　要：以聚酰亚胺(PI)作为绝缘介质包覆羰基铁粉制备铁粉芯,研究了包覆后铁粉芯的相组成、微观形貌及PI添加量对铁粉芯电阻率、致密度、损耗及磁导率等性能的影响。研究表明,PI作为绝缘包覆剂能较均匀地包覆在羰基铁粉表面,制备的铁粉芯具有良好的磁性能。随PI加入量增加,铁粉表面绝缘层厚度增大,电阻率增高,涡流损耗降低。当PI添加量为1.0 wt%时,铁粉芯的综合性能最佳:磁导率为107.7,损耗为458.4 mW/cm^(3)。损耗分离显示,铁粉芯的损耗主要通过降低磁滞损耗与剩余损耗得到改善。In this study,the iron powder cores were prepared by coating carbonyl iron powder with polyimide(PI)as an insulating medium.The effects of the phase composition,microscopic morphology,and the content of PI on the properties of iron powder cores as resistivity,density,core loss and magnetic permeability were investigated.The results showed that PI can cover the surface of carbonyl iron powder uniformly,and the prepared iron powder cores have great magnetic properties.With the increase of PI content,the thickness of insulation layer on the surface of the iron powder increased,which resulted in the increase of resistivity and the decrease of eddy current loss.When the content of PI is 1.0 wt%,the iron powder cores achieved the best comprehensive performance with magnetic permeability of 107.7 and core loss of 458.4 mW/cm^(3).According to the loss separation,the loss of the iron powder cores was improved mainly by reducing the hysteresis loss and residual loss.

关 键 词：聚酰亚胺 铁粉芯 磁导率 损耗 

分 类 号：TM271.2[一般工业技术—材料科学与工程]