Influence of Solidification Rate on Microstructures of Cast Strips and Corresponding Sintered NdFeB Magnets
来源期刊：JOURNAL OF RARE EARTHS2006年增刊第2期
论文作者：Yu Dunbo Yan Shihong Li Zongan Li Shipeng Xu Jing Li Hongwei
Key words：sintered NdFeB magnets; solidification rate; cast strip; microstructure; rare earths;
Abstract: The influences of solidification rate on the microstructures of cast strips and corresponding sintered NdFeB magnets were investigated. The experimental results show that the volume fraction and size of columnar grains vary with the wheel speed V, and the fraction is highest to more than 90% with 3.5 μm in average width at V＝2 m·s-1. The reasons for the improved magnetic performance were discussed based on the micromagnetic theory and microstructure analyses of the strips and sintered magnets. The magnetic properties of sintered NdFeB magnets made from the (Nd,Dy)13.0(Fe,Ga,Al)80.5B6.5 cast strip which was obtained at V=2 m·s-1 are as follows: Br=1.15 T(11.25 kG), iHc=2799 kA·m-1 (35.2 kOe) and (BH)max=242 kJ·m-3(30.35 MGOe).
Yu Dunbo1，Yan Shihong1，Li Zongan1，Li Shipeng1，Xu Jing1，Li Hongwei1
(1.National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, and Grirem Advanced Materials Co. Ltd., Beijing 100088, China)
Abstract:The influences of solidification rate on the microstructures of cast strips and corresponding sintered NdFeB magnets were investigated. The experimental results show that the volume fraction and size of columnar grains vary with the wheel speed V, and the fraction is highest to more than 90% with 3.5 μm in average width at V＝2 m·s-1. The reasons for the improved magnetic performance were discussed based on the micromagnetic theory and microstructure analyses of the strips and sintered magnets. The magnetic properties of sintered NdFeB magnets made from the (Nd,Dy)13.0(Fe,Ga,Al)80.5B6.5 cast strip which was obtained at V=2 m·s-1 are as follows: Br=1.15 T(11.25 kG), iHc=2799 kA·m-1 (35.2 kOe) and (BH)max=242 kJ·m-3(30.35 MGOe).
Key words:sintered NdFeB magnets; solidification rate; cast strip; microstructure; rare earths;
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