Microstructure and magnetic properties of soft magnetic powder cores of amorphous and nanocrystalline alloys

Journal of Magnetism and Magnetic Materials, Volume 330, March 2013, Pages 119-133
Yapi Liu, Yide Yi, Wei Shao, Yanfang Shao

 

College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China

Zhejiang High & Well Magnetics Enterprise Technology Co. Ltd, HMETC, Jinhua 321016, China

 

Abstract

With the development of modern ferromagnetic technology, soft magnetic powder cores (MPCs) of amorphous and nanocrystalline alloys have been intensively studied for their excellent soft magnetic properties such as high flux density, low coercivity and reduced core loss due to amorphous state and nanocrystalline grains of 10–20 nm dispersed in a residual amorphous matrix. In this paper, the microstructures and soft magnetic properties, i.e., maximum magnetic induction Bm, effective permeabilityue, DC-bias properties and volume power losses PCV of MPCs made from amorphous powder of gas atomization and nanocrystalline powder of pulverized melt-spun ribbon were investigated and also compared on the basis of the same level of ue. It is found that ue of both kinds of MPC keeps unchanged up to 1 MHz. The amorphous MPC has lower PCV at lower frequency range, while the nanocrystalline MPC has lower PCVat high frequency range instead. Also, the nanocrystalline MPC has better DC-bias property. Moreover, theDC magnetic properties and the changes of PCV of both MPCs with frequency and flux density are also studied. Furthermore, the electromagnetic characteristics, the microstructures and the mechanisms accounting for these phenomena of both MPCs are also discussed.

 

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