Magnetic Properties of Nanocrystalline Powder Cores Fabricated by Mechanically Crushed Powders  

作　　者：Chun-bo HUANG Tian-cheng LIU Xiang-yue WANG Cao-wei LU De-ren LI Zhi-chao LU 

机构地区：[1]China Iron and Steel Research Institute Group [2]Advanced Technology and Materials Co.,Ltd.

出　　处：《Journal of Iron and Steel Research International》2015年第1期67-71,共5页

基　　金：Sponsored by National High-tech Research and Development Program(863 Program)of China(2013AA030802)

摘　　要：Fe73. 5 Cu1 Nb3 Si15.5B7 nanocrystalline powder cores with different particle sizes ranging from 10 to 125 9m were fabricated by cold-pressing techniques. The cores exhibited increased core loss P cv and decreased initial permea- bility μi with addition of fine powders below 50 μm in size, and the content should be less than 40 mass%. It was thought to be closely related to the high coercive force H c due to the stresses generated during the crushing process and high demagnetization fields of small powders. Furthermore, modifying the alloy compositions by adding defined amount of Ni could improve the soft magnetic properties, including superior characteristics of permeability under high direct current （DC） bias field and comparable low core loss at high frequency.Fe73. 5 Cu1 Nb3 Si15.5B7 nanocrystalline powder cores with different particle sizes ranging from 10 to 125 9m were fabricated by cold-pressing techniques. The cores exhibited increased core loss P cv and decreased initial permea- bility μi with addition of fine powders below 50 μm in size, and the content should be less than 40 mass%. It was thought to be closely related to the high coercive force H c due to the stresses generated during the crushing process and high demagnetization fields of small powders. Furthermore, modifying the alloy compositions by adding defined amount of Ni could improve the soft magnetic properties, including superior characteristics of permeability under high direct current （DC） bias field and comparable low core loss at high frequency.

关 键 词：nanocrystalline powder core mechanical crush particle size DC bias 

分 类 号：TM27[一般工业技术—材料科学与工程] O611.3[电气工程—电工理论与新技术]