铁基软磁复合材料成形和热处理工艺研究  

COMPRESSING AND HEAT-TREATMENT PROCESS OF IRON-BASED SOFT MAGNETIC COMPOSITES

作　　者：田建军[1,2] 张德金 袁勇 崔建民 李霆 

机构地区：[1]莱芜钢铁集团粉末冶金有限公司,山东莱芜271109 [2]北京科技大学,北京100083

出　　处：《粉末冶金工业》2011年第4期49-52,共4页Powder Metallurgy Industry

基　　金：国家科技支撑项目(2009BAE74B03);广东省教育部产学研结合项目(2009B090300443);国家自然科学基金(51004011)

摘　　要：采用磷化处理后的还原铁粉,通过压制、热处理获得铁基软磁复合材料(ISMCs),探讨了成形压力和热处理工艺对材料磁导率、磁损耗和频率特性影响。研究结果显示,900 MPa压力获得密度为7.2 g/cm3磁粉芯,振幅磁导率aμ≥100(30～250 kHz),且μa频率稳定性好(变化量≤0.02～0.03/kHz)。经400℃热处理后,aμ超过120(30～250 kHz),提高了20%。热处理温度超过450℃,磁粉芯的磁损耗显著增加、μa急剧下降。损耗分离研究显示,磁损耗增加主要体现在涡流损耗急剧上升。再经TG-DTA分析,磷化铁粉在462℃时出现一个明显的吸热峰,主要是磷酸氢盐发生分解反应,导致绝缘层破坏,进而影响材料的磁性能。The iron-based soft magnetic composites（ISMCs） were prepared by pressing using phosphatizated reduced iron powder. Effects of the pressure and heat-treatment on the amplitude permeability, magnetic loss and frequency characteristics of ISMCs were discussed in this paper. Results shows that the density of ISMCs compressed under 900 MPa reaches 7.2 g/cm^3 ,and the amplitudeμa is higher than 100 （30-250 kHz） while frequency stability exhibits excellent （the p. change≤0.02-0.03/kHz）. When ISMCs are heat-treated at 400℃ for 30 minutes,μa increases 20% and exceeds 120. But when the heat-treated temperature is above 450℃, the magnetic loss increases obviously andμa, decreases acutely. The separation of magnetic loss indicates that the increase of magnetic loss is attributed to the eddy current loss. The TG-DTA curves of the phosphatization powder shows an obvious endothermic peak at 462℃ ,and it means phosphates on the surface of powder decompose,which results the insulating film breakdown and magnetic properties deterioration.

关 键 词：软磁复合材料 磷化 压制 热处理 振幅磁导率 磁损耗 

分 类 号：TF123.7[冶金工程—粉末冶金]