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1、工艺·技术·应用FeSiAl磁粉表面绝缘包覆及热处理对磁粉芯磁性能的影响王怡伟，刘颖，李军，钟小溪(四川大学材料科学与工程学院，四川成都610064)摘要：从减小铁硅铝磁粉芯的涡流损耗和磁滞损耗出发，将FeSiAl磁粉通过单层树脂包覆、磷化/树脂复合包覆、磷化/硅烷复合包覆方法制得绝缘包覆磁粉，用模压成型法制备磁粉芯，并通过退火热处理消除其内应力。结合SEM、XRD及XPS分析磁粉表面形貌及成分组成，采用LCR电桥及阻抗分析仪测试磁粉芯磁性能。研究发现，铁硅铝磁粉双层包覆较单层树脂包覆处理后的磁粉芯磁性能更优，其中磷化/硅烷复合处理效果最佳，在5MHz频率附近其Q值
2、约是单层树脂包覆处理的5倍，是磷化/树脂复合处理的3倍。退火热处理能释放磁粉芯残余内应力，改善磁导率。随热处理温度升高，磁导率增高。在0~7MHz频率，400℃为提高FeSiAl磁粉芯磁导率和品质因素Q值综合性能的最佳热处理温度。关键词：FeSiAl磁粉芯；磁粉包覆；涡流损耗；热处理；磁导率；品质因数中图分类号：TM271+.2文献标识码：A文章编号：1001-3830(2014)03-0025-04EffectofpowdersurfaceinsulationcoatingandheattreatmentonthemagneticpropertiesofFeSiA
3、lmagneticpowdercoresWANGYi-wei,LIUYing,LIJun,ZHONGXiao-xiCollegeofMaterialsScienceandEngineering,SichuanUniversity,Chengdu610064,ChinaAbstract：Aimingatreducingtheeddycurrentlossandhysteresislossofthemagneticpowdercores,coattheFeSiAlpowderwascoatedbysinglelayerresin,phosphate/resincompo
4、site,phosphate/silanecompoundtoobtaintheinsulatingcoatingpowder,andpreparepowdercoresbycompressionmoldingmethod,andthenannealingittoeliminatetheinternalstress.Magneticproperties,surfacemorphologyandchemicalcompositionweretested,andmagneticpowdercoresweretestedusingLCRbridgeandimpedance
5、analyzer.Itisfoundthatthemagneticperformanceofdouble-coatedoneisbetterthanthatofthesingle-resin-coated,amongwhichthecompositeprocessingofalkylationtothephosphatedsiliconisthebest,at5MHzfrequencyinthevicinityofitsQvalueisabout5timesthatofthesingle-resin-coatedone,and3timesthatofthephosp
6、hatedresin-coatedone.Theannealingheattreatmenttothemagneticpowdercorescanhelpreleasingtheresidualstressandimprovingthemagneticpermeability.Withtheincreaseoftemperature,thepermeabilityincreases.Between0to7MHzfrequency,400℃isthebestprocessingtemperaturetoimprovetheFeSiAlmagneticcoreperme
7、abilityandthequalityfactorQvaluewhichmeanstheoverallperformanceofthemagneticpowdercores.Keywords:FeSiAlpowdercores;powder-coating;eddycurrentloss;heattreatment;permeability;qualityfactor1引言其工作频段不断拓宽，如何减小其在高频下的损耗成为一个重要的研究课题。铁硅铝磁粉芯作为一种高频性能好、成本低的铁硅铝等磁粉芯的损耗主要由涡流损耗和磁软磁材料，其市场需求日益旺盛，如用作高频功
