| Title |
A Study on the Formability and Magnetic Properties of Iron-based Amorphous Powder Cores Mixed with Pure Iron Powder |
| Authors |
윤성춘(Sung Choon Yoon); 문선규(Sun Gyu Moon); 손근용(Keun Yong Sohn); 박원욱(Won Wook Park) |
| DOI |
https://doi.org/10.3365/KJMM.2014.52.8.649 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
amorphous; magnetic meterials; powder processing; magnetic properties; scanning electron microscopy; SEM |
| Abstract |
The effects of densification on the magnetic properties were studied in Fe-based amorphous powder cores mixed with pure iron powder. To normalize the effect of powder size on magnetic properties, the rapidly solidified amorphous powders were sieved and classified. The amorphous powders of .150 to +270 mesh were mixed with the pure iron powder of 3 μm in diameter up to 20 wt%. The powder composites were mixed with 2 wt% water glass diluted by DI Water at a ratio of 1:2. For the consolidation, the powder composites were compacted into a cylindrical die with lubricant to form toroidal cores, which were subsequently heat-treated at 430-460 ℃ for 10 minutes. The soft magnetic properties of the powder cores were investigated using a B-H curve analyzer and a flux meter at the frequency range of 10-100 kHz. The microstructure of the mixed powders and the compacted cores were observed using FE-SEM. It was notable that the density of the powder composites increased with an increase of the pure iron powders. As a result, the permeability and the core loss of the composite cores (especially, mixed with ~10 wt% pure iron powders) were greatly improved over those of conventional amorphous powder cores. |