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Vol.29, No.7, 709 ~ 717, 1991

Title

The Effect of Hot - Pressing on the Magnetic properties for R - Fe - B Alloys (2) ( The Effect of Composition and Deformation Variables on the Magnetic properties for Nd - Fe - B - Cu Permanent magnet )

김동엽D . Y . Kim, 정원용W . Y . Jeung, 강일구I . K . Kang, 오재현J . H . Oh

Abstract

Hot-pressing of cast Nd-Fe-B alloy was tried out for the shortening of manufacturing process for anisotropic R-Fe-B magnet. The effects of composition and working variables on the magentic properties for Nd-Dy-Fe-B-Cu magnets were studied. The results are as follows: 1. Dendritic growth to the direction of mold wall was observed in as-cast Nd-Dy-Fe-B-Cu alloys. Magnetization measured to the normal direction to the solidification showed higher values than the values measured to the parallel direction. 2. Hot-pressing of Nd-Dy-Fe-Cu alloy invoked alignement of grains to press direction 3. In Nd_xDy₁Fe_(92.5-x)B_5Cu_(1.5)(x=13∼16) and Nd_(14) Dy₁Fe_(83.5-y)B_yCu_(1.5)(Y=4∼8) alloys, the optimal magnetic properties of hot-pressed magnets were attained at x=14 and y=5. 4. It was confirmed that added Cu existed in Nd rich phase.

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