Dy 拡散処理したNdFeB 焼結磁石のDy 分布と保磁力

概要

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To clarify the effect of Dy diffusing process for NdFeB magnets on their coercivity, the distribution and concentration of diffused Dy in a Nd2Fe14B grain were quantitatively image-analyzed. The case in which Dy diffused 10 % area from the surface of each Nd2Fe14B grain at the moderate temperatures shows the significant increase in coercivity of 7.5 kOe at 0.4 mass% Dy. In this case, Dy diffuses ordinally into grains from the surface toward the inside. On the contrary, in case of the excessive treatment such as 1000 °C, the expanding of the Dy-diffused area and also concentrating of Dy from the surface toward the inside of grains were simultaneously observed.