기계적 합금화법에 의한 Fe2O3-Zn계 연자성 복합분말의 제조 및 특성평가

이충효; Chung-Hyo Lee

Korean Journal of Materials Research, Vol.30, No.2, 74-80, February, 2020

DOI10.3740/MRSK.2020.30.2.74 Export Citation

기계적 합금화법에 의한 Fe2O3-Zn계 연자성 복합분말의 제조 및 특성평가

Synthesis and Characterization of Soft Magnetic Composite Powders in Fe2O3-Zn System by Mechanical Alloying

이충효^†

목포대학교 신소재공학과

Chung-Hyo Lee^†

Department of Advanced Materials Science and Engineering, Mokpo National University, Muan 58554, Republic of Korea

E-mail:

Synthesis of composite powders for the Fe2O3-Zn system by mechanical alloying (MA) has been investigated at room temperature. Optimal milling and heat treatment conditions to obtain soft magnetic composite with fine microstructure were investigated by X-ray diffraction, differential scanning calorimetry (DSC) and vibrating sample magnetometer (VSM) measurement. It is found that α-Fe/ZnO composite powders in which ZnO is dispersed in α-Fe matrix can be obtained by MA of Fe2O3 with Zn for 4 hours. The change in magnetization and coercivity also reflects the details of the solid-state reduction process of hematite by pure metal of Zn during MA. Densification of the MA powders was performed in a spark plasma sintering (SPS) machine at 900 ~ 1,000 °C under 60 MPa. Shrinkage change after SPS of sample MA'ed for 5 hrs was significant above 300 °C and gradually increased with increasing temperature up to 800 °C. X-ray diffraction results show that the average grain size of α-Fe in the α-Fe/ZnO composite sintered at 900 °C is in the range of 110 nm.

Keywords:soft magnetic composite powders;Fe2O3-Zn system;magnetic properties;spark plasma sintering

[References]

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Fukunaga T, Kuroda N, Lee CH, Koyano T, Mizutani U, J. Non-Cryst. Solids, 176, 98 (1994)
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Mizutani U, Lee CH, Mater. Trans. JIM, 36, 210 (1995)
Schnitzke K, Schultz L, Wecker J, Katter M, Appl. Phys. Lett., 57, 2853 (1990)
Herzer G, IEEE. Trans. Magn., 25, 3327 (1989)
Schultz L, Wecker J, Mater. Sci. Eng., 99, 127 (1988)

[Referenced By]

[1] Koch CC, Cavin OB, Mckamey CG, Scarbrough JO, Appl. Phys. Lett., 43, 1017 (1983)

[2] Schwarz RB, Koch CC, Appl. Phys. Lett., 49, 146 (1986)

[3] Eckert J, Schultz L, J. Less Common Met., 166, 293 (1990)

[4] Schwarz RB, Johnson WL, Phys. Rev. Lett., 51, 415 (1983)

[5] Ogino Y, Murayama S, Yamasaki T, J. Less Common Met., 168, 221 (1991)

[6] Lee CH, J. Ceram. Process. Res., 9, 321 (2008)

[7] Mattheiss LF, Phys. Rev. B: Condens. Matter Mater. Phys., 45, 3252 (1992)

[8] Fukunaga T, Kuroda N, Lee CH, Koyano T, Mizutani U, J. Non-Cryst. Solids, 176, 98 (1994)

[9] Fecht HJ, Hellstern E, Fu Z, Johnson WL, Metall. Mater. Trans. A, 21, 2333 (1990)

[10] Tokumitsu K, Mat. Sci. Forum, 88-90, 715 (1992)

[11] Izumi H, Izumi K, Kudaka K, J. Jpn. Soc. Powder Powder Metall, 48, 1051 (2001)

[12] Kubaschewski O, Alcock CB, Metallurgical Thermochemistry, 5th ed., p.268, Pergamon Press, New York (1983).

[13] Hall WH, J. Inst. Met., 75, 1127 (1948)

[14] Mizutani U, Lee CH, Mater. Trans. JIM, 36, 210 (1995)

[15] Schnitzke K, Schultz L, Wecker J, Katter M, Appl. Phys. Lett., 57, 2853 (1990)

[16] Herzer G, IEEE. Trans. Magn., 25, 3327 (1989)

[17] Schultz L, Wecker J, Mater. Sci. Eng., 99, 127 (1988)