이방성 Sr - 페라이트 / 레진본드 영구자석에서 Sr - 페라이트 자성분말의 방향성

다국어 초록 (Multilingual Abstract)

The alignment of Sr-ferrite magnetic powders, which is usually related to the fluidity and the applied magnetic field, is investicated in the anisotropic Sr-ferrite /resin-bonded permanent magnets. The magnetic powder alignment is observed to increase with the applied magnetic field and the fluidity which is a function of molding temperature and powder packing ratio. The rest magnetic powder alignment is achieved at the following conditions; Sr-ferrite packing ratio of 56vol%, apparent viscosity of about 3000 poise in 1000sec-¹ shear rate, and applied magnetic field of about 5kOe. The degree of preferred orientation of the magnetic powders in the field direction, as determined by the dc hysterisis graphs, is 84~85%(0.84~0.85). This result is in agreement with the value of 0.85 obtained by the X-ray experiments in the 2θ range of 23~40^0. The best magnetic properties obtained are; 2.2kG of remanent flux density, 2.2MGOe of maximum energy product.