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No.3(pp.81-113)

Home > Issues > Volume 13 (2008) > No.3(pp.81-113)

Preparation of Na¹₂Fe₁₄B Single Domain Particles from Nd-Fe-B Alloy Ingot Using a Combination of HDDR and Mechanical Milling

Journal of Magnetics, Volume 13, Number 3, 30 Sep 2008, Pages 102-105

J.I. Lee(School of Materials Science and Engineering, Pukyong National University), H.W. Kwon*

(School of Materials Science and Engineering, Pukyong National University), Y.S. Kang(Department of Chemistry, Sogang University)

Abstract

This study examined the feasibility of the combining HDDR-process (hydrogenation, disproportionation, desorption and recombination) with mechanical milling to prepare single domain Na¹₂Fe₁₄B particles from a Nd-Fe-B alloy ingot. The Na¹₁₅Fe₇₇B₈ alloy was HDDR-treated and then subjected to a roller-milling. In the HDDR-treated Na¹₁₅Fe₇₇B₈ alloy, very small Na¹₂Fe₁₄ B grains comparable to their critical single domain size(0.3 ) were observed. These fine individual grains were separated successfully along the grain boundaries by a roller-milling. The separated Na¹₂Fe₁₄Bgrains were found to be single domain particles. These results suggest that single domain particles of the Na¹₂Fe₁₄B phase can be prepared from a Nd-Fe-B ingot alloy by combining a HDDR-process with mechanical milling.

Keywords: Nd-Fe-B alloy Na1_2Fe_14 B compound; single domain particle; HDDR-process

DOI: 10.4283/JMAG.2008.13.3.102

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