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모합금의 균질화처리가 HDDR 처리된 Nd-Fe-Ga-Nb-B 합금의 자기적 특성에 미치는 영향
유지훈,이상협,김동환,이동원,김병기,최문희,김양도,Yu, J.H.,Lee, S.H.,Kim, D.H.,Lee, D.W.,Kim, B.K.,Choi, M.H.,Kim, Y.D. 한국분말야금학회 2009 한국분말재료학회지 (KPMI) Vol.16 No.4
HDDR treated anisotropic Nd-Fe-B powders have been widely used, due to their excellent magnetic properties, especially for sheet motors and sunroof motors of hybrid and electric vehicles. Final microstructure and coercivity of such Nd-Fe-B powders depend on the state of starting mother alloys, so additional homogenization treatment is required for improving magnetic properties of them. In this study, a homogenization treatment was performed at $900\sim1140^{\circ}C$ in order to control the grain size and Nd-rich phase distribution, and at the same time to improve coercivity of the HDDR treated magnetic powders. FE-SEM was used for observing grain size of the HDDR treated powder and EPMA was employed to observe distribution of Nd-rich phase. Magnetic properties were analyzed with a vibrating sample magnetometer.
체심정방정 구조 Fe-Co계 합금상의 합성 및 그 자기적 특성
김경민(K. M. Kim),권해웅(H. W. Kwon),이정구(J. G. Lee),유지훈(J. H. Yu) 한국자기학회 2017 韓國磁氣學會誌 Vol.27 No.4
Bulk-type body-centered-tetragonal Fe-Co alloy was synthesised by utilising a conventional alloy preparation technologies, such as melting, solidification, and homogenising treatments, and its magnetic properties were investigated. In the (Fe<SUB>100−x</SUB>Co<SUB>x</SUB>)<SUB>1−y</SUB>C<SUB>y</SUB> alloy, the composition range, from which single phase body-centered-tetragonal alloy (martensite phase) was obtained, was severely limited: Co content x = 2.5, and C content y = 0.062. Tetragonality(c/a) of the synthesised body-centered-tetragonal (Fe<SUB>97.5</SUB>Co<SUB>2.5</SUB>)<SUB>0.938</SUB>C<SUB>0.062</SUB> alloy was 1.05. Magnetocrystalline anisotropy constant (K₁) of the body-centered-tetragonal (Fe<SUB>97.5</SUB>Co<SUB>2.5</SUB>)<SUB>0.938</SUB>C<SUB>0.062</SUB> alloy was measured to be 9.8 × 10⁵ J/㎥), which was 3.1 time as high as the pure iron (α-Fe).