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No.4(pp.127-164)

Home > Issues > Volume 7 (2002) > No.4(pp.127-164)

HDDR Characteristics and Magnetic Properties of Nd₁₅(Fe_1-xCo_x)₇₇B₈ (x=0-0.6) Alloys

Journal of Magnetics, Volume 7, Number 4, 31 Dec 2002, Pages 127-131

H.W. Kwon*

(School of Materials Science and Engineering, Pukyong National University)

Abstract

HDDR characteristics and magnetic properties of Nd₁₅(Fe_1-xCo_x)₇₇B₈(x=0-0.6) alloys were investigated. The effect of applying magnetic field during the recombination step on the anisotropic nature of the HDDR-treated material was also examined. The Nd₂(Fe,Co)₁₄B phase in the Nd-Fe-B alloys with high Co-substitution alloy had remarkably enhanced phase stability. The Nd₁₅(Fe_1-xCo_x)₇₇B₈(x=0-0.6) alloys with high Co-substitution could be HDDR-treated successfully by only using high pressure hydrogen. However, these alloys had no appreciable coercivity. The poor coercivity of the HDDR-treated Nd₁₅(Fe_1-xCo_x)₇₇B₈(x=0-0.6) alloys with high Co-substitution was attributed to the Nd(Fe,Co)₂phase in the alloys. The magnetic filed applied during the recombination step had little effect on the anisotropic nature of the HDDR-treated powder.

Keywords: HDDR; Hydrogenation; Disproportionation; Desorption; Recombination; NdFeCoB

DOI:

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