Fabrication and Magnetic Properties of Mg and BaFe12O19 Ferromagnetic Composite Powders by Mechanical Alloying

Chung-Hyo Lee

doi:10.3740/MRSK.2021.31.2.61

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2021 Vol.31, Issue 2 Next Page

Fabrication and Magnetic Properties of Mg and BaFe₁₂O₁₉ Ferromagnetic Composite Powders by Mechanical Alloying 기계적합금화법에 의한 Mg-BaFe₁₂O₁₉ 계 강자성 복합분말의 제조 및 자기특성

February 2021. pp. 61-67

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Abstract

Fabrication of a ferromagnetic composite powder for the magnesium and BaFe₁₂O₁₉ system by mechanical alloying (MA) is investigated at room temperature. Mixtures of Mg and BaFe₁₂O₁₉ powders with a weight ratio of Mg:BaFe₁₂O₁₉ = 4:1, 3:2, 2:3 and 1:4 are used. Optimal MA conditions to obtain a ferromagnetic composite with fine microstructure are investigated by X-ray diffraction, differential scanning calorimetry (DSC) and vibrating sample magnetometer (VSM) measurement. It is found that Mg-BaFe₁₂O₁₉ composite powders in which BaFe₁₂O₁₉ is dispersed in Mg matrix are successfully produced by MA of BaFe₁₂O₁₉ with Mg for 80 min. for all compositions. Magnetization of Mg- BaFe₁₂O₁₉ composite powders gradually increases with increasing the amounts of BaFe₁₂O₁₉, whereas coercive force of MA powders gradually decreases due to the refinement of BaFe₁₂O₁₉ powders with MA time for all compositions. However, it can be seen that the coercivity of Mg-BaFe₁₂O₁₉ MA composite powders with a weight ratio of Mg:BaFe₁₂O₁₉=4:1 and 3:2 for MA 80 min. are still high, with values of 1260 Oe and 1320 Oe compared to that of Mg:BaFe₁₂O₁₉=1:4. This clearly suggests that the refinement of BaFe₁₂O₁₉ powders during MA process for Mg:BaFe₁₂O₁₉=4:1 and 3:2 tends to be suppressed due to ductile Mg powders.

Keywords

metal matrix composite

Mg-BaFe₁₂O₁₉ powders

mechanical alloying

magnetization

coercivity

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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 : 31
No :2
Pages :61-67
Received Date : 2020-12-21
Revised Date : 2021-01-12
Accepted Date : 2021-01-13
DOI :https://doi.org/10.3740/MRSK.2021.31.2.61

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

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