粉末挤出成型法制备FeCuNbSiB纳米晶磁粉芯

FeCuNbSiB nanocrystalline magnetic powder core moulded by powder press extrusion method

采用粉末挤出成型法制备了FeCuNbSiB纳米晶磁粉芯,并讨论了纳米晶粉体粒度对磁粉芯磁性能的影响。结果表明,粘结剂配方为硬脂酸1%、聚丙烯40%、石蜡59%采用粉末挤出成型法可以制备粉体与粘结剂比例为5∶1的FeCuNbSiB纳米晶磁粉芯;粉级搭配可提高磁粉芯密度,300、200与100目质量比为6∶3∶2的磁粉芯密度相对于300目FeCuNbSiB纳米晶磁粉芯提高了5%,达到了3.76g/cm2;200目FeCuNbSiB纳米晶粉为33%,180℃、1h热处理,磁粉芯有效磁导率μe为10.44、中心频率为600kHz、中心频率品质因数Q值为44。

The research moulded FeCuNbSiB nanocrystalline magnetic cores by powder press extrusion method,and studied their magnetic conductance of different core sizes.The study showed that：by adopting a composition（stearic acid 1%,polypropylene 40%,paraffin 59%）to make adhesive,mixing with the powder,of a powder/adhesive=5∶1（weight）,FeCuNbSiB nanocrystalline magnetic powder core can be produced by powder press extrusion method;mixture of different sizes of powders can enhance magnetic powder core density.A mixture of 300,200 and 100 mesh（6∶3∶2,weight）powder,possesses a 5% higher density,reaches 3.76 g/cm2,compared to nanocrystalline magnetic powder coreprepared by 300 mesh FeCuNbSiB.Of core made of 200-mesh FeCuNbSiB nanocrystalline powder with a weight percentage of 33%,and heat treatment processed at temperature 180℃ for 1 h,its μe is 10.44,center frequency is 600kHz,and Q value equals 44.