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인산염 피막처리 분말을 사용한 Fe - 6.0 wt%Si 합금 압분자심의 자기적 특성
장대호(D. H. Jang),노태환(T. H. Noh),김광윤(K. Y. Kim),최광보(G. B. Choi) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.5
Dust cores (compressed powder cores) of Fe-6.0 wt%Si alloy with a size of 35~180 ㎛ in diameter have been prepared by phosphate coatings and annealings at 600~900℃ for 1 h in nitrogen atmosphere. Further the magnetic and mechanical properties of the powder cores were investigated. As a general trends, the compressive strength and core loss decreased with the increase in annealing temperature. When annealed at 800℃, the compressive strength was 15 ㎏f, the permeability and quality factor were 74 and 26, respectively. Moreover the core loss at 50 ㎑ and 0.1 T induction was 750 ㎽/㎤, and the percent permeability under the static field of 50 Oe was estimated to be about 78. In addition, the cut-off frequency in the curve representing the frequency dependence of effective permeability was measured to be around 200 ㎑. These properties of the Fe-6.0 wt%Si alloy dust cores could be considered to be due to the good insulation effect of iron-phosphate coats, the decrease in magnetocrystalline anisotropy and saturation magnetostriction and the increase in electric resistivity.