The effect of substitution of neodymium with praseodymium in sintered magnets of type NdFeB on their magnetic and process properties in the concentration range of [Pr] = 0 – 13 wt.% is studied. The special features of milling of the alloys, sintering processes and heat treatments in the production of magnets containing praseodymium are discussed. Hysteresis characteristics of B r ≥ 1.2 T, H cJ ≥ 1200 kA/m, H cb ≥ 880 kA/m, H k ≥ 960 kA/m, and BH max ≥ 280 kJ/m3 are obtained for magnets with composition (in wt.%) 33 Nd, 10 Pr, 1.5 (Ti + Al + Cu), 1.3 B, the remainder Fe.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
Notes
Here and below in the paper the content of elements is given in weight percent.
References
I. V. Belyaev, M. V. Pikunov, and P. V. Bondarenko, “About the microstructure of ingots from alloys or type Nd15 Fe78 B7,” Metally, No. 5, 40 – 43 (1994).
A. S. Neiva, A. P. Tschiptschin, and F. P. Missell, “Phase diagram of the Pr – Fe – B system,” J. Alloys Compd., 217, 273 – 282 (1995).
F. Vial, F. Joly, E. Nevalainen, M. Sagawa, et al., “Improvement of coercivity of sintered NdFeB permanent magnets by heat treatment,” J. Magn. Magn. Mater., 242 – 245, 1329 – 1334 (2002).
V. A. Glebov and A. A. Lukin, Nanocrystalline Rare-Earth Magnetic Materials [in Russian], IO VNIINM, Moscow (2007), 179 p.
W. F. Li, T. Ohkuba, and K. Hono, “Effect of post-sinter annealing on the coercivity and microstructure of Nd – Fe – B permanent magnets,” Acta Mater., 57, 1337 – 1346 (2009).
H. Sepehri-Amin, T. Ohkubo, T. Shima, and K. Hono, “Grain boundary and interface chemistry of an Nd – Fe – B sintered magnet,” Acta Mater., 60, 819 – 830 (2012).
A. Yan, X. Sang, Z. Chen, and X. Wang, “Characterization of microstructure and coercivity of Nd – Fe – B magnets with Ti and Al or Cu addition,” J. Magn. Magn. Mater., 101, 369 – 374 (1991).
T. Akiya, H. Sepehri-Amin, et al., “Low temperature diffusion process using rare earth–Cu eutectic alloys for hot-deformed Nd – Fe – B magnets,” J. Appl. Phys., 115, 17A766 (2014).
Author information
Authors and Affiliations
Corresponding author
Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 10, pp. 27 – 33, October, 2016.
Rights and permissions
About this article
Cite this article
Dormidontov, N.A., Dormidontov, A.G., Lileev, A.S. et al. Effect of Partial Substitution of Neodymium with Praseodymium on the Magnetic and Process Properties of Sintered Magnets of Type NdFeB. Met Sci Heat Treat 58, 608–613 (2017). https://doi.org/10.1007/s11041-017-0064-6
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11041-017-0064-6