FE-AL ALLOY POWDER FOR MATERIAL OF SOFT MAGNETIC CORE, METHOD FOR PREPARING SAME AND METHOD FOR PREPARING SOFT MAGNETIC CORE USING SAME

摘要

The present invention relates to an Fe-Al alloy powder for a material of a soft magnetic core having superior direct current bias characteristics and low core loss, a method for preparing the Fe-Al alloy powder and to a method for preparing a soft magnetic core using the Fe-Al alloy powder. The present invention provides a method for preparing alloy powder comprising: a step of dissolving a composition having 10 to 16 wt % of Al and a remainder of Fe into an alloy; and a step of injecting the dissolved alloy to prepare alloy powder. Further, the present invention provides a method for preparing a soft magnetic core comprising: a step of performing a heat treatment on the thus-prepared alloy powder for 1 to 5 hours under an atmosphere of hydrogen, nitrogen or a mixture gas of hydrogen and nitrogen, the atmosphere maintaining the temperature of approximately 700 to 1100°C; a step of performing insulation coating on the heat-treated alloy powder with ceramic; a step of compression molding the alloy powder insulation-coated with the ceramic into a core; and a step of performing a heat treatment on the molded core. As described above, the soft magnetic core prepared according to the present invention exhibits better direct current bias characteristics than those of conventional soft magnetic cores and has low specific resistance, and therefore, has less core loss than those of conventional soft magnetic cores and exhibits superior moldability.