Low temperature diffusion process using rare earth-Cu eutectic alloys for hot-deformed Nd-Fe-B bulk magnets

Journal Article · Wed May 07 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4869062· OSTI ID:22273727

Sepehri-Amin, H.; Ohkubo, T. ^[1]; Liu, J.; Hono, K. ^[1]; Hioki, K.; Hattori, A. ^[2]

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1. Elements Strategy Initiative Center for Magnetic Materials, National Institute for Materials Science, Tsukuba 305-0047 (Japan)
2. Daido Steel Co., LTD, Nagoya 457-8545 (Japan)

The low temperature grain boundary diffusion process using RE{sub 70}Cu{sub 30} (RE = Pr, Nd) eutectic alloy powders was applied to sintered and hot-deformed Nd-Fe-B bulk magnets. Although only marginal coercivity increase was observed in sintered magnets, a substantial enhancement in coercivity was observed when the process was applied to hot-deformed anisotropic bulk magnets. Using Pr{sub 70}Cu{sub 30} eutectic alloy as a diffusion source, the coercivity was enhanced from 1.65 T to 2.56 T. The hot-deformed sample expanded along c-axis direction only after the diffusion process as RE rich intergranular layers parallel to the broad surface of the Nd{sub 2}Fe{sub 14}B are thickened in the c-axis direction.

• OSTI ID: 22273727
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
ANISOTROPY
COERCIVE FORCE
COPPER ALLOYS
DIFFUSION
EUTECTICS
GRAIN BOUNDARIES
IRON BORIDES
LAYERS
MAGNETIC MATERIALS
MAGNETS
NEODYMIUM COMPOUNDS
POWDERS
PRASEODYMIUM ALLOYS
PRASEODYMIUM COMPOUNDS
SINTERING
SURFACES
TEMPERATURE DEPENDENCE