Mischmetal-FeB-(Co,Ti,Al) 영구자석

고관영; 윤석길; 김세환; K.Y. Ko; S. Yoon; S.H. Kim

Korean Journal of Materials Research, Vol.9, No.10, 1037-1040, October, 1999

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Mischmetal-FeB-(Co,Ti,Al) 영구자석

Mischmetal-FeB-(Co,Ti,Al) Permanent Magnets

고관영, 윤석길¹, 김세환²

영국 Salford 대학교 물리학과 Joule 연구소
¹울산대학교 재료공학과
²천안공업전문대학 금형과

K.Y. Ko, S. Yoon¹, and S.H. Kim²

Joule Lab., Dept. of Physics, Salford University, Salford M5 4WT.U.K, Korea
¹Department of Materials Science, University of Ulsan, Ulsan 680-749, Korea
²Dept. of Die and Mould, Chonan National Technical College, Chonan 330-240, Korea

초록

열간압축 및 다이업셋한 Mischmetal-FeB-(C0,Ti,Al) 영구자석의 자기적 특성과 미세조직을 시료진동형 자력계, 투과전자 현미경, 주사전자 현미경, X-선 회절기를 이용하여 조사하였다. (MM) 12.5 Fe 71.9 Co 5.0 Al 2.0 B 8.6 조성의 열간압축 자석은 H c =4.27 kOe, 4.27 kOe, B r =4.75 kG, 4.75kG, \textrm{(BH)}_{max}=3.82MGOe의특성?3.82MGOe의특성을보였다.다이업셋자석은 \textrm{H}_{c}$ =3.10 kOe, 3.10 kOe, B r =5.58 kG, 5.58kG, \textrm{(BH)}_{max}=5.34MGOe의특성?5.34MGOe의특성을나타냈다. \textrm{(MM)}_{12.5}\textrm{Fe}_{77.9}\textrm{Ti}_{1.0}\textrm{B}_{8.6}조성의경우,열간압축자석은 \textrm{H}_{c}$ =3.75 kOe, 3.75 kOe, B r =4.64 kG, 4.64kG, \textrm{(BH)}_{max}=2.78MGOe,다이업2.78MGOe,다이업셋자석은 \textrm{H}_{c}$ =3.29 kOe, 3.29 kOe, B r =5.01 kG, 5.01kG, \textrm{(BH)}_{max}$ =3.54 MGOe의 특성? 3.54 MGOe의 특성을 보였다. X-선 회절 및 투과전자 현미경 조사결과에 의하면, 다이업셋 자석에서 c축이 다이업셋 방향으로 놓이는 결정이방성이 나타나며, 이는 다이어셋 자석의 에너지적의 증가와 관련이 있는 것으로 보인다. Co의 Fe에 대한 일부 치환은 열간압축자석의 자기이방성을 증가시키는 것으로 나타났다.

Magnetic characteristics of some anisotropic mischmetal- FeB- (Co,Ti,Al) permanent magnets have been investigated. The magnets were fabricated by using hot-pressed and die-upsetting. Hot-pressed (MM) 12.5 Fe 71.9 Co 5.0 Al 2.0 B 8.6 permanent magnet showed H c =4.27 kOe, 4.27 kOe, B r =4.75 kG, 4.75kG, \textrm{(BH)}_{max}=3.82MGOe,anddie?3.82MGOe,anddie?upsetmagnetshowed \textrm{H}_{c}$ =3.10 kOe, 3.10 kOe, B r =5.58 kG, 5.58kG, \textrm{(BH)}_{max}=5.34MGOe,respectiv5.34MGOe,respectively.Hot?pressed \textrm{(MM)}_{12.5}\textrm{Fe}_{77.9}\textrm{Ti}_{1.0}\textrm{B}_{8.6}permanentmagnetshowed \textrm{H}_{c}$ =3.75 kOe, 3.75 kOe, B r =4.64 kG, 4.64kG, \textrm{(BH)}_{max}=2.78MGOe,anddie?2.78MGOe,anddie?upsetmagnetshowed \textrm{H}_{c}$ =3.29 kOe, 3.29 kOe, B r =5.01 kG, 5.01kG, \textrm{(BH)}_{max}$ =3.54 MGOe, respectiv 3.54 MGOe, respectively. X-ray diffraction and transmission electron microscopy revealed that the higher energy products in the die-upset magnets results from alignment of the c-axis along the die-upsetting direction. The magnetic anisotropy in hot-pressed MM-FeB- Al magnet is increased by the substitution of Co for Fe.

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[3] Ko KY, Booth JG, Al-Kanani HJ, Lee HY, J. Kor. Magn. Soc. : J. of Magn., 1, 82 (1996)

[4] Ko KY, Yoon S, Booth JG, J. Magn. Magn. Mat., 176, 313 (1997)

[5] Buschow KHJ, Rep. Prog. Phys., 54, 1123 (1991)

[6] Fuerst CD, Brewer EG, J. Appl. Phys., 70, 6444 (1991)