Preparation of anisotropic NdFeB magnets with different Nd contents by hot deformation (die-upsetting) using hot-pressed HDDR powders

作者: S Liesert , A Kirchner , W Grünberger , A Handstein , P De Rango

DOI: 10.1016/S0925-8388(97)00439-8

关键词:

摘要: Abstract In this work HDDR powders were used for the preparation of highly densified anisotropic NdFeB magnets by die-upsetting process. with different Nd contents (14 at %, 16 at % and 18 at %) grain sizes in order to determine most favourable composition microstructure a production crack-free maximum texture optimum magnetic properties. The hot compacted vacuum at 725°C 150 MPa. Then samples deformed an argon atmosphere 750°C strain rate 10 −3 s −1 . Using around 0.3 μm, corresponding coercivity μ 0 j H c 1 T, content 14 deformation degree 0.9, remanence 1.2 T 0.7 obtained. However large amount cracks present die-upset sample Nd. By increasing suppression was achieved increase observed, but are reduced. For 0.95 could be produced.

参考文章(16)
Raja K. Mishra, Crystallographic and magnetic alignment in die-upset Nd-Fe-B magnets Journal of Materials Engineering. ,vol. 11, pp. 87- 93 ,(1989) , 10.1007/BF02833758
Lin Li, C. D. Graham, Mechanism of texture formation by hot deformation in rapidly quenched FeNdB Journal of Applied Physics. ,vol. 67, pp. 4756- 4758 ,(1990) , 10.1063/1.344776
L. Schultz, K. Schnitzke, J. Wecker, Preparation and properties of mechanically alloyed rare earth permanent magnets Journal of Magnetism and Magnetic Materials. ,vol. 80, pp. 115- 118 ,(1989) , 10.1016/0304-8853(89)90336-3
M. Tokunaga, Y. Nozawa, K. Iwasaki, S. Tanigawa, H. Harada, Magnetic properties of isotropic and anisotropic Nd-Fe-B bonded magnets Journal of Magnetism and Magnetic Materials. ,vol. 80, pp. 80- 87 ,(1989) , 10.1016/0304-8853(89)90329-6
Y. Yoshida, Y. Kasai, T. Watanabe, S. Shibata, V. Panchanathan, J. J. Croat, Hot workability of melt-spun Nd-Fe-Co-B magnets Journal of Applied Physics. ,vol. 69, pp. 5841- 5843 ,(1991) , 10.1063/1.347844
Y. Yoshida, N. Yoshikawa, T. Nishio, Y. Kasai, V. Panchanathan, J. J. Croat, Effect of additives on hot deformation behavior of melt-spun Nd-Fe-Co-B magnets Journal of Applied Physics. ,vol. 70, pp. 6363- 6365 ,(1991) , 10.1063/1.349943
W. Heisz, L. Schultz, Isotropic and anisotropic Nd‐Fe‐B‐type magnets by mechanical alloying and hot pressing Applied Physics Letters. ,vol. 53, pp. 342- 343 ,(1988) , 10.1063/1.100602
P.J. McGuiness, C. Short, A.F. Wilson, I.R. Harris, The production and characterization of bonded, hot-pressed and die-upset HDDR magnets Journal of Alloys and Compounds. ,vol. 184, pp. 243- 255 ,(1992) , 10.1016/0925-8388(92)90498-X
D. Book, I.R. Harris, Hydrogen absorption/desorption and HDDR studies on Nd16Fe76B8 and Nd11.8Fe82.3B5.9 Journal of Alloys and Compounds. ,vol. 221, pp. 187- 192 ,(1995) , 10.1016/0925-8388(94)01433-7