Fabrication and Structural Observation of a Soft Magnetic Composite Powders by Mechanical Alloying

Chung-Hyo Lee

doi:10.3740/MRSK.2019.29.4.252

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2019 Vol.29, Issue 4 Preview Page Next Page

Fabrication and Structural Observation of a Soft Magnetic Composite Powders by Mechanical Alloying 기계적합금화법에 의한 연자성 복합분말의 제조 및 구조관찰

April 2019. pp. 252-257

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Abstract

Fabrication of soft magnetic composite powders for the Fe₂O₃-Ca system by mechanical alloying(MA) has been investigated at room temperature. It is found that soft magnetic composite powders in which CaO is dispersed in α-Fe matrix are obtained by MA of Fe₂O₃ with Ca for 5 hours. Changes in magnetization and coercivity also reflect the details of the solidstate reduction process of hematite by pure metal of Ca during MA. The saturation magnetization of MA powders increases with increasing MA time and reaches a maximum value of 65 emu/g after 7 hours of MA. The average grain size of α-Fe in MA powders, estimated by diffraction line-width, gradually decreases with increasing MA time and reaches 52 nm after 5 hours of MA. It can also be seen that the coercivity of the 5-hour MA sample is fairly high at 190 Oe, suggesting that the grain refinement of already-produced α-Fe tends to clearly occur during MA.

Keywords

a soft magnetic composite powders

large negative reaction heat

magnetic properties

mechanical alloying

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 29
No :4
Pages :252-257
Received Date : 2019-03-14
Revised Date : 2019-04-02
Accepted Date : 2019-04-03
DOI :https://doi.org/10.3740/MRSK.2019.29.4.252

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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