Al2O3 첨가에 따른 Fe계 나노결정립 P/M시트의 전자파 흡수특성
Electromagnetic Wave Absorption Properties of Fe-basedNanocrystalline P/M sheets with Al2O3 additive
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Abstract
wave absorbing materials have been developed to reduce electromagnetic interference (EMI) for electronic devices in recent years. In this study, Fe-Si-B-Nb-Cu base amorphous strip was pulverized using a jet mill and an attritor and heat-treated to get flake-shaped nanocrystalline powders, and then the powders were mixed, cast and dried with dielectric Al2O3 powders and binders. As a result, the addition of Al2O3 powders improved the absorbing properties of the sheets noticeably compared with those of the sheets without dielectric materials. The sheet mixed with 2 wt% Al2O3 powder showed the best electromagnetic wave absorption, which was caused by the increase of the permittivity and the electric resistance due to the dielectric materials finely dispersed on the Fe-based powder.
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