4.6 Article

Microstructure features of high performance soft magnetic alloy Fe-3 wt.% Si prepared by metal injection molding

Journal

MATERIALS CHEMISTRY AND PHYSICS
Volume 273, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2021.125068

Keywords

Fe-Si soft Magnetic material; Metal injection molding; Permeability; Magnetic domain; Grain boundary angle

Funding

  1. National Thirteenth Five-Year Plan for National Key R & D Program: Research on Simulation Verification and Design Optimization of Key Technologies for High Speed Maglev Transportation System [2016YFB1200602-02]

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Appropriate large grain size and distribution of large grain boundary angles in the range of 30 degrees to 60 degrees are beneficial to soft magnetic properties; uniform and broad magnetic domains also play an important role in the preparation of high-performance soft magnetic materials.
The effects of sintering parameters and microstructure features on magnetic properties of Fe-3 wt.% Si alloy prepared by metal injection molding (MIM) was investigated in this study. The sample with high density, the saturation induction (Bs) of 2.0 T, maximum permeability (mu(max)) of 25 mH/m, coercivity of 22.4 A/m was obtained at 1300 degrees C for 4 h in hydrogen atmosphere, and the properties of which are close to that of high silicon steel. The microstructure, impurities of C and O, distribution of grain boundary angles and magnetic domain of the sintered alloys were analyzed in correlation with the magnetic properties. It is found that a suitable large grain size of about 300 mu m and large grain boundary angles distributed in the range of 30 degrees-60 degrees are beneficial to soft magnetic properties. Moreover, uniform and broad magnetic domains also play an important role in preparation of high performance soft magnetic materials.

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