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1、工藝·技術(shù)·應(yīng)用FeSiAl磁粉表面絕緣包覆及熱處理對磁粉芯磁性能的影響王怡偉,劉穎,李軍,鐘小溪(四川大學(xué)材料科學(xué)與工程學(xué)院,四川成都610064)摘要:從減小鐵硅鋁磁粉芯的渦流損耗和磁滯損耗出發(fā),將FeSiAl磁粉通過單層樹脂包覆、磷化/樹脂復(fù)合包覆、磷化/硅烷復(fù)合包覆方法制得絕緣包覆磁粉,用模壓成型法制備磁粉芯,并通過退火熱處理消除其內(nèi)應(yīng)力。結(jié)合SEM、XRD及XPS分析磁粉表面形貌及成分組成,采用LCR電橋及阻抗分析儀測試磁粉芯磁性能。研究發(fā)現(xiàn),鐵硅鋁磁粉雙層包覆較單層樹脂包覆處理后的磁粉芯磁性能更優(yōu),其中磷化/硅烷復(fù)合處理效果最佳,在5MHz頻率附近其Q值
2、約是單層樹脂包覆處理的5倍,是磷化/樹脂復(fù)合處理的3倍。退火熱處理能釋放磁粉芯殘余內(nèi)應(yīng)力,改善磁導(dǎo)率。隨熱處理溫度升高,磁導(dǎo)率增高。在0~7MHz頻率,400℃為提高FeSiAl磁粉芯磁導(dǎo)率和品質(zhì)因素Q值綜合性能的最佳熱處理溫度。關(guān)鍵詞:FeSiAl磁粉芯;磁粉包覆;渦流損耗;熱處理;磁導(dǎo)率;品質(zhì)因數(shù)中圖分類號:TM271+.2文獻(xiàn)標(biāo)識碼:A文章編號: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?其工作頻段不斷拓寬,如何減小其在高頻下的損耗成為一個重要的研究課題。鐵硅鋁磁粉芯作為一種高頻性能好、成本低的鐵硅鋁等磁粉芯的損耗主要由渦流損耗和磁軟磁材料,其市場需求日益旺盛,如用作高頻功