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Fe76-xCu₁MoxSi₁₄B9(x=2, 3) 초미세 결정합금의 자기적 특성
피우갑(W.K.Pi),노태환(T.H.Noh),김희중(H.J.Kim),강일구(I.K.Kang) 한국자기학회 1991 韓國磁氣學會誌 Vol.1 No.1
The effect of annealing on the magnetic properties and the microstructures of the amorphous Fe_(76-x)Cu₁Mo_xSi₁₄B_9(x=2, 3) alloye were investigated. When annealed at 500℃ for 1hr, 8~9×10³ of the effective permeability and 3~4 A/m of the coercive force were achieved upon crystallization to α-Fe phase. And the average diameter of the α-Fe grains was about 20 ㎚. For the nanocrystalline ferromagnets, the fine grain size is the important requirement to obtain a good soft magnetic property. In this work, in order to get the finer grain size of α-Fe phase, two-step annealing treatment was given. That is, following the low-temperature annealing at 400℃ for 1~3hr, the high-temperature annealing at 500℃ for 1hr was carried out. As the low-temperature annealing time increased, the effective permeability increased to 1.2~1.7×10⁴ and the coercive force decreased to about 2 A/m. And the grain size was observed to be smaller than 10㎚. The increased permeability and the decreased coercive force were attributed to the reduced average crystalline anisotropy by the refinement of α-Fe(Si) grains.
프라스틱 자석용 Sm2 (Co . M) 17계 자성분말에서 Cu, Sm 함량이 자기적 특성에 미치는 영향
오재현,정원용,피우갑 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.2
This study investigated effects of Cu and Sm contents and heat treatments on magnetic properties and formation of cell structures of Sm₂(Co, M)_(17) powders. In the Sm (Co_(bal) Fe_(24-x/4)CU_xZr_(028))_(8.35) system, coercive force and residual induction increased as xincreased upto 0.12 and 0.08, respectively. In the Sm(Co_(672)Fe_(220)Cu_(080)Zr_(028))_Z system, coercive force increased as Z increased from 8.05 to 8.50. When Z=8.50, values for i_(Hc) and B, were 17KOe and 9.5KG, respectively, after solution treatment at 1,100℃ followed by isothermal aging at 800℃ for 24 hours.
Fe-Cu-M-(Si, B) (M = V, Nb, Mo, Ta, W) 합금의 연자기특성 (軟磁氣特性)
강일구,김희중,노태환,이명복,피우갑 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.4
Dependence of the effective permeability on annealing and the annealing-induced structural change for amorphous Fe_(73.5)Cu₁M₃Si_(13.5)B_9(M=V, Nb, Mo, Ta or W)and Fe_(73.5)Cu₁Nb₃(Si_xB_(1-x))_(22.5)(x=0∼0.8) alloys were investigated. Crystalline Fe_(73.5)Cu₁M₃Si_(13.5)B_9(M=V, Nb, Mo, W)alloys with α-Fe phase which was obtained by annealing at above T_x showed higher effective permeability than with amorphous phase, and the increase in permeability upon crystallization was large in the order of V$lt;W$lt;Mo$lt;Nb. For amorphous Fe_(73.5)Cu₁Nb₃(Si_xB_(1-x))_(22.5) alloys in the composition range from x=0.5 to 0.8, soft magnetic property was improved by crystallization. Moreover, in that composition range, the effective permeability increased with the Si content(x). Superior soft magnetic property of the high-Si alloys was attributed to both the small magnetocrystalline anisotropy and the low magnetostriction. The effective permeabilities measured at 1㎑ and 5 m0e for crystalline Fe-Cu-Mo-Si-B and Fe-Cu-Nb-Si-B(0.5≤x≤0.8) alloys were about 1∼2 × 10⁴, and it was comparable to that of the zero-magnetostriction Co-based amorphous alloys.