환원-확산법에 의한 Sm-Fe-N계 자성분말 제조 (Synthesis of Magnetic Powder in the Sm-Fe-N System by the Reduction-Diffusion Process)

서지정보

· 발행기관 : 대한금속·재료학회
· 수록지 정보 : 대한금속·재료학회지 / 48권 / 9호 / 842 ~ 846페이지
· 저자명 : 이정구, 강석원, 박상준, 오영우, 최철진

초록

In the present study, the reduction-diffusion method was employed to produce Sm-Fe alloy powder.
It was confirmed that the amount of unreacted α-Fe in Sm2Fe17 matrix gradually decreased as the percentage of Sm2O3 increased. Sm2Fe17 single-phase powder was produced by the reduction-diffusion method with 40%excess Sm2O3. The Ca and Oxygen contents of the powder were approximately 300 ppm and 1600 ppm,respectively, after washing and acid treatment. By a subsequent nitrogenation, Sm2Fe17Nx magnetic powders were produced. The coercivity of the powder increased with decreasing of the particle size by ball milling, and the highest coercivity of 2850 Oe was obtained after milling for 10 hours.

영어초록

In the present study, the reduction-diffusion method was employed to produce Sm-Fe alloy powder.
It was confirmed that the amount of unreacted α-Fe in Sm2Fe17 matrix gradually decreased as the percentage of Sm2O3 increased. Sm2Fe17 single-phase powder was produced by the reduction-diffusion method with 40%excess Sm2O3. The Ca and Oxygen contents of the powder were approximately 300 ppm and 1600 ppm,respectively, after washing and acid treatment. By a subsequent nitrogenation, Sm2Fe17Nx magnetic powders were produced. The coercivity of the powder increased with decreasing of the particle size by ball milling, and the highest coercivity of 2850 Oe was obtained after milling for 10 hours.

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