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The effects of Fe nano-powders on compaction behaviors and magnetic properties of SMCs

Title
The effects of Fe nano-powders on compaction behaviors and magnetic properties of SMCs
Author
김종렬
Keywords
Soft magnetic composite; Bimodal powder; Tensile strength; Magnetic permeability; Core loss
Issue Date
2019-06
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, v. 480, Page. 33-39
Abstract
Currently, metallic soft magnetic composites, due to their high saturation magnetization, have attracted much attention for application in high frequency mobile devices. These composites must approach a full densification to achieve the high permeability and magnetic flux density necessary for mobile device applications. This study was carried out to investigate the effects of Fe nano-powders on the compaction behaviors and magnetic properties of Fe-Si alloy composites. Fe-Si micro-powders were fabricated using a gas-atomizer; then, SiO2 was coated on them to suppress eddy current loss. Fe-nano-powders were obtained using spray-dried Fe2O3 powders. These nano-powders were homogeneously mixed with Fe-Si micro-powders to increase the density of the compacts. As a result, the composite with 80 wt% micro-powders showed excellent high frequency properties due to high compaction density. Microstructural analysis shows that changes in the magnetic properties of the composites are dependent on the fill factor and electrical path-ways of non-insulated nano-powders in pores between insulated micro-powders.
URI
https://www.sciencedirect.com/science/article/pii/S0304885318331597https://repository.hanyang.ac.kr/handle/20.500.11754/116603
ISSN
0304-8853; 1873-4766
DOI
10.1016/j.jmmm.2019.02.034
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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