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Coercivity enhancement in hot-pressed Nd-Fe-B permanent magnets with low melting eutectics

Sawatzki, Simon and Dirks, Almut and Frincu, Bianca and Löwe, Konrad and Gutfleisch, Oliver (2014):
Coercivity enhancement in hot-pressed Nd-Fe-B permanent magnets with low melting eutectics.
In: Journal of Applied Physics, pp. 17A705, 115, (17), ISSN 0021-8979, [Online-Edition: http://dx.doi.org/10.1063/1.4859097],
[Article]

Abstract

Nd-Fe-B melt-spun ribbons with optimized composition for hot workability have been hot-compacted together with low melting DyCu, DyNiAl, NdCu, and NdAl powders to enhance coercivity. Annealing at 600 °C leads to an interdiffusion of Dy and Nd at the interfaces between the Nd-Fe-B flakes and the Dy-rich phase. This modifies the grain boundary phase and thus further enhances coercivity without decreasing remanence. The higher coercivity for DyCu compared to DyNiAl was attributed to the lower melting point obtained by differential scanning calorimetry. For NdCu and NdAl, annealing was found to be ineffective.

Item Type: Article
Erschienen: 2014
Creators: Sawatzki, Simon and Dirks, Almut and Frincu, Bianca and Löwe, Konrad and Gutfleisch, Oliver
Title: Coercivity enhancement in hot-pressed Nd-Fe-B permanent magnets with low melting eutectics
Language: English
Abstract:

Nd-Fe-B melt-spun ribbons with optimized composition for hot workability have been hot-compacted together with low melting DyCu, DyNiAl, NdCu, and NdAl powders to enhance coercivity. Annealing at 600 °C leads to an interdiffusion of Dy and Nd at the interfaces between the Nd-Fe-B flakes and the Dy-rich phase. This modifies the grain boundary phase and thus further enhances coercivity without decreasing remanence. The higher coercivity for DyCu compared to DyNiAl was attributed to the lower melting point obtained by differential scanning calorimetry. For NdCu and NdAl, annealing was found to be ineffective.

Journal or Publication Title: Journal of Applied Physics
Volume: 115
Number: 17
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 19 May 2014 11:38
Official URL: http://dx.doi.org/10.1063/1.4859097
Identification Number: doi:10.1063/1.4859097
Funders: We thank the BMWi (Bundesministerium f. Wirtschaft und Technologie) via IGF (Industrielle Gemeinschaftsforschung), AiF (Allianz Industrie Forschung), and FVA (Forschungsvereinigung Antriebstechnik e.V.) for financial support.
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