발간논문

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Vol.27, No.12, 1094 ~ 1104, 1989
Title
Application of a Hydrogenation to Production of the Nd2Fe14B Permanent Magnet
최유Jeon Choi, 박충년Choong Nyeon Park, 최답천Dap Chun Choi
Abstract
Powders of a bulk ingot of Nd-Fe-B permanent magnet were prepared by a combination of hydrogenation and mechanical milling. In-situ observation revealed that cracks, during hydrogenation, were initiated at the grain bounderies where Nd-rich phases existed and then propagated into the matrix of Nd2Fe14B phase. The powders were aligned and pressed in the hydrided condition and the green compacts were sintered at 1100℃ for 1 hr, followed by heat treatment at 600℃ for 1 hr. The maximum value of the (BH)max, of 37 MGOe was obtained with the sample which was planetary ball milled for 18 min after the hydrogenation at 13 atm. This value of (BH)max is comparable with that of the mag-nets produced by mechanical milling only.
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