Dysprosium Nitride-Modified Sintered Nd–Fe–B Magnets with Increased Coercivity and Resistivity

概要

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The magnetic properties, electrical resistivity and related microstructures of (Nd,Pr)14.5Dy1.2FebalAl0.8B6 magnets modified by DyN addition have been investigated. The coercivity of the magnets increases almost linearly as a function of DyN content without a considerable reduction in remanence. Similarly, the resistivity in the transversal orientation increases from 1.6 to about 2.0 μ$\Omega$ m. N dissolves in the grain boundary Nd-rich phase, leading to the formation of an N-containing amorphous phase. This amorphous phase is found to enhance the electrical resistivity. Dy tends to diffuse into the matrix phase, enriched on the matrix side of the interface between the grain boundary phase and the matrix. The significant improvement of the coercivity is ascribed to the increased anisotropy of R2Fe14B by partial substitution of Dy for Nd.
2010-09-25