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RISS 인기검색어
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- 저자 : 김윤배(Y.B.KIM) (검색결과 98 건)
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Nd - Fe - B계 소결자석의 자기적특성 향상 연구
김윤배(Yoon B. Kim),정우상(W.S. Jung),정원용(W.Y. Jeung) 한국자기학회 2002 한국자기학회지 Vol.12 No.2
In order to increase the magnetic properties of a Nd-Fe-B sintered magnet, the general factors including particle size and its distribution, volume fraction of Nd₂Fe₁₄B phase, degree of alignment of Nd₂Fe₁₄B grain, oxygen content and grain size etc. should be optimized by controlling the composition of Nd-Fe-B alloy as well as the manufacturing process. In this study, fabrication of the Nd-Fe-B sintered magnet was carried out in a laboratory scale by controlling the composition of Nd-Fe-B alloy and the manufacturing process. The optimum milling condition was found by investigating the milling media, milling time and ball size. The addition of FeGa was effective to increase the coercivity of the Nd-Fe-B sintered magnet. A remanence of 14.4 kG, a coercivity of 9.4 kOe and a maximum energy product of 47 MGOe were obtained from the sintered magnet.
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고특성 Nd₁₂Fe80B6(Nb, M) (M=Ti / Cu / Ga)급속응고리본의 자기특성
김윤배(Y. B. Kim),김창석(C. S. Kim),김동환(D. H. Kim),이갑호(K. H. Lee),김택기(T. K. Kim) 한국자기학회 1992 한국자기학회지 Vol.2 No.1
Magnetic properties and microstructures of Nd₁₂Fe_(80)B_6(Nb, M) (M=Ti/Cu/Ga) melt-spun ribbons prepared by single wheel technique have been studied. The results of microstructural study have shown that Ga is effective for the orientation of c-axis normal to the ribbon plane. The Ga-added melt-spun ribbon, Nd₁₂Fe_(80)B_6(Nb, Ga), quenched at Vs=17.9 ㎧ was mostly composed of fine grains of about 30 ㎚ in size with the textured free-side surface. The powder of this ribbon aligned in magnetic field showd a high remanence of 0.87 T which was about 5% higher than that of ribbon itself. It is believed that there is a possibility to fabricate a new type of HIREM melt-spun ribbon with highly textured free-side surface.
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NdxFe77B₂₃-x(4<x<13) 급속응고 합금의 자기특성
박우식(W. S. PARK),김윤배(Y. B. KIM),김희태(H. T. KIM),조용수(Y. S. CHO),김창석(C. S. KIM),박만장(M. J. PARK) 한국자기학회 1995 한국자기학회지 Vol.5 No.1
Nd_xFe_(77)B_(23-x)(x = 4, 6, 8, 11, 13) alloys were prepared by rapid quenching technique. They were crystallized at higher than 650℃ and subsequently the magnetic properties were investigated. The melt-spun alloy of x=8 consisted of nearly single metastable compound Nd₂Fe₂₃B₃ and showed the soft magnetic property. In 8≤x≤13 alloys, the coercivities were increased according to the increase of Nd content but the remanences decreased. In 4≤x≤6 alloys, the coercivities and the remanences were increased by lowering Nd content. In x = 4 alloy, the ratio of soft to hard magnetic phase was 70 : 30 and the energy product was 96 kJ / ㎥ (12MG.Oe).
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조용수(Y. S. Cho),김윤배(Y. B. Kim),김창석(C. S. Kim),김택기(T. K. Kim) 한국자기학회 1994 한국자기학회지 Vol.4 No.2
In order to invetigate the effect of Pr additive on the magnetostriction of amorphous Fe-B alloys, amorphous Fe_(86-x)B₁₄ Pr_x (2≤x≤8 at. %) alloys were prepared by a rapid solidification process. As the Pr content increased in the as-prepared amorphous Fe_(84)B₁₄Pr₂ alloy annealed at 300℃ for 2 hr increased to 70 ppm Ac power loss and permeability(f= 50㎑, Bm = 0.1 T) of the annealed amorphous Fe_(84)B₁₄Pr₂ alloy were 15 W/㎏ and 5.5 × 10³, respectively.
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Fe - B - Al계 비정질합금의 자왜 및 자기탄성효과
조용수(Y. S. Cho),김윤배(Y. B. Kim),김창석(C. S. Kim),김택기(T. K. Kim) 한국자기학회 1993 한국자기학회지 Vol.3 No.2
Saturation magnetostriction and magnetoelastic properties of amorphous Fe_(82)B_(18-x)Al_x and Fe_(80)B_(20-x)Al_x alloys have been studied. Saturation magnetostriction of the alloys has increased according to the increase of Al content. The amorphous Fe_(82)B₁₄A₄ alloy shows the highest saturation magnetostriction of 45 ppm among the alloy systems. The ratio of maximum magnetic induction change to tensile stress of this alloy is about 0.026 Tㆍ㎟/N, and it is considered to be applicable for a high resolution mechanical sensor.
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고잔류자화 α-Fe기 Nd-Fe-B 초미세결정립 합금의 자기특성
조용수(Y. S. Cho),김윤배(Y. B. Kim),박우식(W. S. Park),김창석(C. S. Kim),김택기(T. K. Kim) 한국자기학회 1995 한국자기학회지 Vol.5 No.1
The effects of Nb and Cu additives as will as substitutional Co into Nd₄Fe_(85.5)B_(10.5) melt-spun alloy were studied aiming for finding a α-Fe based Nd-Fe-B composite alloys with high energy product. The addition of Nb and Cu to Nd₄Fe_(85.5)B_(10.5) decreased the average grain size and increased the coercivity up to 207㎄/m(2.6kOe). Furthermore, the substitution of Co for Fe in Nd₄Fe_(82)B_(10)Nd₃Cu₁ alloy resulted in the decrease of the average grain size (< 2O㎚) and improved the hard magnetic properties. The remanence, coercivity and energy product of optimally annealed Nd₄Fe_(74)Co_8B_(10)Nb₃Cu₁ alloy were 1.345, 219㎄/m(2.75kOe) and 95.5kJ/㎥ (12MGOe), respectively.
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