Synthesis of Fe–Pt–B nanocomposite magnets with high coercivity by rapid solidification
Synthesis of Fe–Pt–B nanocomposite magnets with high coercivity by rapid solidification
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DOI：
10.1063/1.2172547
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发表时间：
2006-04
影响因子：
3.2
通讯作者：
Wei Zhang;K. Yubuta;Parmanand Sharma;A. Inoue
中科院分区：
文献类型：
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作者：
Wei Zhang;K. Yubuta;Parmanand Sharma;A. Inoue
采用熔体快淬技术在Febal.Pt30- 32 B18 -20合金中直接获得了高矫顽力的L10 FePtScinFe 2B型纳米复合磁体。快淬态薄带具有良好的硬磁性能。在35 m scins的叶轮圆周速度（Vs）下旋转的Fe 52 Pt 30 B 18合金熔体的剩磁、矫顽力和能量积分别为0.70 T、783 kA scinm和88.0 kJ scinm 3。还观察到该合金的回弹小M-H环。快淬合金具有纳米复合结构，由L10 FePt和Fe 2B相组成，平均晶粒尺寸约为40 nm。良好的硬磁性能解释在纳米级的硬L10 FePt和软Fe 2B磁性相之间的交换磁耦合。该方法简单、一步法制备高矫顽力的纳米复合永磁材料，为今后Fe-Pt基硬磁合金的发展提供了有利条件。
The L10FePt∕Fe2B-type nanocomposite magnets with high coercivity have been obtained in the Febal.Pt30–32B18–20 alloys directly by the melt spinning technique. The as-spun ribbons showed good hard magnetic properties. The remanence, coercivity, and energy product for the Fe52Pt30B18 alloy melt spun at a wheel circumferential speed (Vs) of 35m∕s were 0.70 T, 783kA∕m, and 88.0kJ∕m3, respectively. The spring-back minor M-H loops were also observed for the alloy. The melt-spun alloy has a nanocomposite structure, consisting of L10 FePt and Fe2B phases with the average grain sizes of ∼40nm. The good hard magnetic properties are interpreted in terms of exchange magnetic coupling among the nanoscale hard L10 FePt and soft Fe2B magnetic phases. The present easy and single step process of forming the nanocomposite magnet having high coercivity is encouraging for the future development of Fe–Pt-based hard magnetic alloys.