Microstructure Control and Magnetic Property of Nd-Fe-B Sintered Magnets After Cyclic Heat Treatment

Se-Hoon Kim; Hoon-Sup Kim; Dong-Hwan Kim; Young-Do Kim

doi:10.4150/KPMI.2008.15.6.471

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반복 열처리한 Nd-Fe-B 소결 자석의 미세구조 제어 및 자성특성 평가: 김세훈, 김훈섭, 김동환, 김영도
Microstructure Control and Magnetic Property of Nd-Fe-B Sintered Magnets After Cyclic Heat Treatment: Se-Hoon Kim, Hoon-Sup Kim, Dong-Hwan Kim, Young-Do Kim; Journal of Korean Powder Metallurgy Institute 2008;15(6):471-476
DOI: https://doi.org/10.4150/KPMI.2008.15.6.471

¹한양대학교 신소재공학과
²한양대학교 신소재공학과
³한국기계연구원부설 재료연구소
⁴한양대학교 신소재공학과
¹Division of Materials Science and Engineering, Hanyang University
²Division of Materials Science and Engineering, Hanyang University
³Korea Institute of Materials Science
⁴Division of Materials Science and Engineering, Hanyang University

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Abstract

Sintered Nd-Fe-B magnets have been widely used due to their excellent magnetic properties, especially for driving motors of hybrid and electric vehicles. The microstructure of Nd-Fe-B magnets strongly affects their magnetic properties, in particular the coercivity. Therefore, a post-sintering process like heat-treatment is required for improving the magnetic properties of Nd-Fe-B sintered magnets. In this study, cyclic heat treatment was performed at temperatures between 350°C and 450°C up to 16 cycles in order to control microstructures such as size and shape of the Nd-rich phase without grain growth of the Nd_2Fe_14B phase. The 2 cycles specimen at this temperature range showed more homogeneous microstructure which leads to higher coercivity of 35 kOe than as-sintered one.

Keywords: Nd-Fe-B sintered magnets;Cyclic heat treatment;Magnetic properties;Domain pinning;

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Magnetic Properties and Sintering Behavior of (Nd,Dy)-Fe-B Permanent Magnet by Spark Plasma Sintering
Sun-Yong Song, Jin-Woo Kim, Se-Hoon Kim, Young-Do Kim
Journal of Korean Powder Metallurgy Institute.2012; 19(2): 105. CrossRef
Pt and Polymer Electrolyte Membrane Fuel Cell
Hye-Sook Joo, Jung-Yeul Yun, Han-Shin Choi
Journal of Korean Powder Metallurgy Institute.2011; 18(1): 1. CrossRef
The Coercivity Enhancement of (Nd,Dy)-Fe-B Sintered Magnet by Microstructure Control
Jin-Woo Kim, Se-Hoon Kim, Young-Do Kim
Journal of Korean Powder Metallurgy Institute.2011; 18(1): 18. CrossRef
Magnetic properties of high coercivity Nd23Dy10Fe64TM2B1 sintered magnets by a convergent heat treatment
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Research on Chemical Intermediates.2010; 36(6-7): 859. CrossRef
Coercivity Enhancement of Nd23Dy10Fe64TM2B1Sintered Magnet by Convergent Heat Treatment
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Journal of Korean Powder Metallurgy Institute.2010; 17(1): 1. CrossRef
Effects of thermal stress induced by cyclic heat treatment on sintered (Nd, Dy)-Fe-B magnets
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Metals and Materials International.2010; 16(6): 959. CrossRef

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