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RISS 인기검색어
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- 저자 : 김윤배 ( Won Young Jeung (검색결과 4 건)
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사출성형에 의한 이방성 Nd - Fe - B계 레진본드자석의 자기적 특성
김윤배(Yoon Bae Kim),정우상(Woo Sang Jung),정원용(Won Young Jeung) 한국자기학회 1999 韓國磁氣學會誌 Vol.9 No.2
In the present work, magnetic and rheological characteristics of anisotropic Nd-Fe-B type resin bonded magnet produced by injection molding using polypropylene as a binder were investigated with the variation of powder loading in compound, applied magnetic field and injection molding temperature. The maximum powder loading determined by torque sensor was 70.7 vol.%. The remanence and maximum energy product of resin bonded magnet were increased with increasing the powder loading in compound and showed a maximum value at the powder loading of 54 vol.%. Further increase of powder loading above 54 vol.% resulted in the decrease of remanence and maximum energy product. On the other hand, there was no change in coercivity with the variation of powder loading in compound. The decrease of remanence and maximum energy product above the powder loading of 54 vol.% is due to the decrease of degree of powder alignment caused by the decrease of fluidity of compound, which could be confirmed by the measurement of viscosity using capillary rheometer. The magnetic properties of resin bonded magnet were increased with increasing the injection molding temperature. This is due to the increase of powder alignment by improving the fluidity of compound at high temperature.
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사출성형용 컴파운드의 유변학적 특성에 미치는 Sm - Co 계 분말의 입도 영향
정우상(Woo Sang Jung),김윤배(Yoon Bae Kim),정원용(Won Young Jeung) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.4
Rheological characteristics of Sm-Co type plastic magnet compound for powder Injection molding process were investigated with the variation of the magnetic powder size, their relative contents and volume fraction using the mixture of fine and coarse powder. Shear viscosity of Sm-Co type compound was decreased with increasing the size of coarse powder due to the increase of powder packing density. However, the smaller the average size of fine powder resulted in the higher viscosity of compound due to the increase of agglomeration force. In case of mechanically milled Sm-Co type powder, the viscosity of compound with the mixture of coarse powder of 125~75 ㎛ and fine powder of average size of 4.9 ㎛ greatly depends on their relative contents and shows a minimum value at the 60 % coarse powder fraction. This means that the compound shows a maximum packing density at the 60 % coarse powder fraction. Compound viscosities satisfied well the rheological model with the volume fraction of magnetic powder, and maximum volume fraction of magnetic powder in Sm-Co type compound for powder injection molding was about 66 %.
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Sm(Co.688-xFe.₂₄₂Cu.07Zrx)7.404 소결자석의 자기적 특성에 미치는 Zr의 영향
정우상(Woo Sang Jung),김윤배(Yoon Bae Kim),정원용(Won Young Jeung) 한국자기학회 2002 韓國磁氣學會誌 Vol.12 No.5
Microstructure and magnetic properties of Sm-Co sintered magnet were investigated with the variation of Zr content and their solution treatment and aging temperatures. The fraction of eutectic structure and the size of eutectic area decreased with increasing x value of cast Sm(Co._(688-x)Fe.₂₄₂Cu._(07)Zr_x)_(7.404) alloys. On the other hand, x=0.022 ingot had finer dendritic structure compared to the other alloys. The sintered magnet of Sm(Co._(688-x)Fe.₂₄₂Cu._(07)Zr_x)_(7.404) had well defined cell structure which is composed of cell boundary SmCo_5 and cell interior Sm₂Co_(17) phase. Cell boundary SmCo_5 phase has 20 ㎚ thickness and its relative angle was 120° in x=0.018 and 0.022 alloys. Cell size was decreased with increasing Zr contents. But, x=0.026 alloy has diffuse cell boundary and irregular shape compared to x=0.022 and 0.018 alloys. Maximum value of coercive force and maximum energy product were obtained from x=0.022 alloys. Optimum solution treatment temperature of Sm(Co._(688-x)Fe.₂₄₂Cu._(07)Zr_x)_(7.404) alloy was 1170℃ and 1st aging temperature of two step aging process for higher coercivity was 850℃.
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