Consolidation and magnetic properties of ferromagnetic Fe-MgO powders prepared by ball milling process (볼밀링법으로 제조된 강자성 Fe-MgO 분말의 벌크화 및 자기적 특성)

Lee Chung-Hyo (이충효)

doi:10.6111/JKCGCT.2024.34.4.125

Consolidation and magnetic properties of ferromagnetic Fe-MgO powders prepared by ball milling process

Journal of the Korean Crystal Growth and Crystal Technology
Abbr : J. Korean Cryst. Growth Cryst. Technol.
2024, 34(4), pp.125~130
DOI : 10.6111/JKCGCT.2024.34.4.125
Publisher : The Korea Association Of Crystal Growth, Inc.
Research Area : Engineering > Materials Science and Engineering
Received : June 13, 2024
Accepted : July 18, 2024
Published : August 31, 2024

Lee Chung-Hyo ¹

¹목포대학교 첨단재료공학과

Accredited

ABSTRACT

Preparation of ferromagnetic powders for the mixture of hematite and pure Mg powders by ball milling has been investigated. Also, consolidation of the ball-milled powders was performed in a spark plasma sintering machine at 800-1,000°C. It is found that a ferromagnetic Fe-MgO composite powders are obtained by ball milling of hematite and pure Mg powders before 1 hour. The magnetization and coercivity of ball-milled samples change at the results of the solid state reaction of hematite by pure Mg during ball milling. The saturation magnetization of ball-milled samples increases with increasing ball milling time and reaches to a maximum value of 93.4 emu/g after 5 hours of ball milling. Shrinkage change after sintering of ball-milled sample for 5 hours was significant above 300°C and gradually increased with increasing temperature up to 800°C. X-ray diffraction result shows that the average grain size of Fe in Fe-MgO bulk sample sintered at 900°C is 50nm. It can be also seen that the coercivity of bulk sample sintered at 900°C is still high value of 90 Oe, indicating that the grain growth of magnetic Fe phase during sintering process tend to be suppressed.

KEYWORDS

Ball milling, Ferromagnetic Fe-MgO powders, Magnetic properties, Consolidation

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Journal of the Korean Crystal Growth and Crystal Technology 2025 KCI Impact Factor : 0.14 KCI-WoS Impact Factor : 0.45

Consolidation and magnetic properties of ferromagnetic Fe-MgO powders prepared by ball milling process

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* References for papers published after 2025 are currently being built.

Journal of the Korean Crystal Growth and Crystal Technology 2025 KCI Impact Factor : 0.14 KCI-WoS Impact Factor : 0.45

Consolidation and magnetic properties of ferromagnetic Fe-MgO powders prepared by ball milling process

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