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Ultra-fine grained Nd–Fe–B by high pressure reactive milling and desorption

Güth, Konrad and Lyubina, Julia and Gebel, Bernhard and Schultz, Ludwig and Gutfleisch, Oliver (2012):
Ultra-fine grained Nd–Fe–B by high pressure reactive milling and desorption.
In: Journal of Magnetism and Magnetic Materials, Elsevier Science Publishing, pp. 2731-2735, 324, (18), ISSN 03048853, [Online-Edition: http://dx.doi.org/10.1016/j.jmmm.2012.03.059],
[Article]

Abstract

This paper reports on the grain refinement in dynamic hydrogenation disproportionation desorption and recombination (d-HDDR) processed Nd-rich Nd2Fe14B and stoichiometric Nd2Fe14B powders using high pressure reactive milling (HPRM) followed by a subsequent desorption and recombination. In contrast to the dynamic-HDDR processed anisotropic powder with a grain size of the Nd2Fe14B phase of 300 nm, the new approach yields a further reduction of the Nd2Fe14B1 grain size to less than 70 nm. Nd-rich Nd2Fe14B powder produced by HPRM and subsequent desorption exhibits a coercivity μ0iHc=1.35 T and a remanence of 0.80 T. In the stoichiometric material, the reduction of the Nd-content leads to an increase in remanence to 0.85 T. Additionally, it is demonstrated that highly anisotropic powders can also be obtained by dynamic-HDDR processing of stoichiometric Nd2Fe14B powders.

Item Type: Article
Erschienen: 2012
Creators: Güth, Konrad and Lyubina, Julia and Gebel, Bernhard and Schultz, Ludwig and Gutfleisch, Oliver
Title: Ultra-fine grained Nd–Fe–B by high pressure reactive milling and desorption
Language: English
Abstract:

This paper reports on the grain refinement in dynamic hydrogenation disproportionation desorption and recombination (d-HDDR) processed Nd-rich Nd2Fe14B and stoichiometric Nd2Fe14B powders using high pressure reactive milling (HPRM) followed by a subsequent desorption and recombination. In contrast to the dynamic-HDDR processed anisotropic powder with a grain size of the Nd2Fe14B phase of 300 nm, the new approach yields a further reduction of the Nd2Fe14B1 grain size to less than 70 nm. Nd-rich Nd2Fe14B powder produced by HPRM and subsequent desorption exhibits a coercivity μ0iHc=1.35 T and a remanence of 0.80 T. In the stoichiometric material, the reduction of the Nd-content leads to an increase in remanence to 0.85 T. Additionally, it is demonstrated that highly anisotropic powders can also be obtained by dynamic-HDDR processing of stoichiometric Nd2Fe14B powders.

Journal or Publication Title: Journal of Magnetism and Magnetic Materials
Volume: 324
Number: 18
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: High pressure reactive milling, HDDR, Grain refinement, Nd–Fe–B textured magnet
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: 18 Apr 2013 09:11
Official URL: http://dx.doi.org/10.1016/j.jmmm.2012.03.059
Identification Number: doi:10.1016/j.jmmm.2012.03.059
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