| Title |
Effects of Magnetic Powder Thickness on Electromagnetic Wave Absorption Characteristics in FeSiCr Flakes/Polymer Composite Sheets |
| Authors |
김주범(Ju Beom Kim); 노태환(Tae Hwan Noh) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
electromagnetic wave absorption; FeSiCr flakes; composite sheets; magnetic powder thickness |
| Abstract |
The effects of magnetic powder thickness on electromagnetic wave absorption characteristics in Fe-6.5Si-0.9Cr (wt%) alloy flakes/polymer composite sheets available for quasi-microwave band have been investigated. The atomized FeSiCr powders were milled by using attritor for 12, 24, and 36 h, powder thickness changed from 40 μm to 3 μm upon 36 h milling. The composite sheet, including thinned magnetic flakes, exhibited higher power loss in the GHz frequency range as compared with the sheets having thick flakes. Moreover, both the complex permeability and the loss factor increased with the decrease in thickness of the alloy flakes. Therefore, the enhanced power loss property of the sheets containing thin alloy flakes was attributed to the flakes of high complex permeability, especially their imaginary part. Additionally, the complex permittivity was also increased with the reduction of flake thickness, and this behavior was considered to be helpful for improvement of the electromagnetic wave absorption characteristics in the composite sheets, including thin alloy flakes. |