Effect of Surface Etching on the Magnetic Properties and Grain-Boundary Dy-Diffusion in DyH2-Dip-Coated Sintered Nd-Fe-B Magnets

공주영; 김태훈; 이성래                                         /LEESEONGRAE; 김효준; 이민우; 장태석                                         /Taesuk Jang

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저자정보: 공주영 김태훈 이성래 /LEESEONGRAE 김효준 이민우 장태석 /Taesuk Jang

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.21 No.3

발행연도: 2015.1

수록면: 600 - 606 (7page)

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We investigated the effects of surface etching on the magnetic and microstructural properties of DyH2-dip-coated, sintered Nd-Fe-B magnets. When the magnets were dip-coated with DyH2 solution after their surfaces had been optimally etched in 1 wt% HNO3 for 50 s, the Dy diffusion depth (~450 μm) improved compared with the values for unetched and DyH2-dip-coated etched magnets (~350 μm). In addition, the core-shell microstructure of the dip-coated magnet was well developed by the optimal etching process. As a result, the coercivity of the dip-coated magnet increased by 4.6%. The optimal surface state of the Nd-Fe-B sintered magnet showed minimal surface damage after it was homogeneously etched along the grain boundaries. In contrast, overetched magnets showed kinks on the demagnetization curves because of surface damage. The relationship between the change in the etched magnet surface and the magnetic properties of dip-coated magnets was examined.

#magnetic materials #sintering #diffusion #grain boundary #magnetic properties

참고문헌 (14)

참고문헌 신청

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