Abstract
Spherical Fe50Ni50 alloy powders were fabricated via a novel route based on in-situ interface de-wetting between liquid Fe-Ni alloy and alumina. The obtained Fe50Ni50 alloy particles exhibit very good spherical shape according to SEM images. Furthermore, the cross-sectional SEM images show that there are no pores and bulk inclusions in the internal region of the spherical particles. The XRD results show a trace amount of the impurity alumina phase appearing in taenite phase. The size distribution agreed well with the SEM observation confirms that the alumina powders successfully segregated pre-alloy powders. As an incidental benefit, the surface alumina particles were treated as the electrical insulation coatings. The magnetic character shows that spherical Fe50Ni50 powders exhibit a good soft magnetic property even though with a slightly decreasing of saturation magnetization due to non-magnetic coatings. Our strategies provide a method to in-situ fabricate insulation coated Fe-Ni spherical alloy powders as magnetic powder core.
Highlights
Soft magnetic alloys and compounds show great potential applications in the field of electronic and energy conversion devices [1,2]
The undesirability of electrical insulation shows some disadvantage for magnetic powder with edges and corners, resulting in the increase of magnetic core loss
A trace amount of the impurity alumina phase was found in the main phase of spherical Fe50 Ni50 alloy powders in Figure 4c even though ultrasonic coupled with magnetic separation in aqueous solution was used to collect the spherical powders. These results show that the spherical Fe-Ni powders are composite powders with alumina insulation coatings
Summary
Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State. Microstructures and Jiangsu Provincial Laboratory for NanoTechnology, Nanjing University, Nanjing 210093, China. College of Engineering and Applied Science, Nanjing University, Nanjing 210093, China. Haian Institute of High-Tech Research, Nanjing University, Nanjing 226600, China
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