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

Güth, Konrad ; Lyubina, Julia ; Gebel, Bernhard ; Schultz, Ludwig ; Gutfleisch, Oliver (2012)
Ultra-fine grained Nd–Fe–B by high pressure reactive milling and desorption.
In: Journal of Magnetism and Magnetic Materials, 324 (18)
doi: 10.1016/j.jmmm.2012.03.059
Article, Bibliographie

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 ; Lyubina, Julia ; Gebel, Bernhard ; Schultz, Ludwig ; Gutfleisch, Oliver
Type of entry: Bibliographie
Title: Ultra-fine grained Nd–Fe–B by high pressure reactive milling and desorption
Language: English
Date: September 2012
Publisher: Elsevier Science Publishing
Journal or Publication Title: Journal of Magnetism and Magnetic Materials
Volume of the journal: 324
Issue Number: 18
DOI: 10.1016/j.jmmm.2012.03.059
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.

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
Last Modified: 19 Apr 2013 11:30
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