Study of Microstructure and Magnetic Properties of Pr-Fe-B-Cu Permanent Magnets by Hot Deformation
来源期刊：JOURNAL OF RARE EARTHS2002年第3期
论文作者：高天明 杨昌平 吴严 陈秀云 朱静 姜忠良
Key words：rare earths; hot deformation; anisotropy; sintering;
Abstract: The relationship between the microstructures and magnetic properties of rare earth cast permanent Pr-Fe-B-Cu alloys by hot deformation was studied. Fine and well-aligned column grains can be obtained by using a proper solidification mould with a high cooling rate. The soft magnetic phase α-Fe can be removed during proper annealing treatment. Hot pressing can produce the anisotropy and refine the grain size, so that the magnetic properties are greatly improved. The technique has the advantages of simple processing, low cost and high benefit, compared with the common sintering processing. Under the condition of the deformation temperature of 1073 K, 90% strain and strain rate of 40×10-3 s-1, the magnetic properties obtained are: Br=1.05 T, i Hc=955 kAm-1, (BH)max=207 kJ*m-3.
高天明1，杨昌平1，吴严1，陈秀云1，朱静1，姜忠良1
(1.Department of Materials Science and Engineering, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China)
Abstract:The relationship between the microstructures and magnetic properties of rare earth cast permanent Pr-Fe-B-Cu alloys by hot deformation was studied. Fine and well-aligned column grains can be obtained by using a proper solidification mould with a high cooling rate. The soft magnetic phase α-Fe can be removed during proper annealing treatment. Hot pressing can produce the anisotropy and refine the grain size, so that the magnetic properties are greatly improved. The technique has the advantages of simple processing, low cost and high benefit, compared with the common sintering processing. Under the condition of the deformation temperature of 1073 K, 90% strain and strain rate of 40×10-3 s-1, the magnetic properties obtained are: Br=1.05 T, i Hc=955 kAm-1, (BH)max=207 kJ*m-3.
Key words:rare earths; hot deformation; anisotropy; sintering;
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