METHOD FOR MANUFACTURING SMD CORE USING Fe-Si ALLOY POWDER

摘要

PURPOSE: A method for manufacturing SMD core using Fe-Si alloy powder is provided to obtain superior magnetic characteristics in a high frequency band, manufacture SMD core having superior saturation magnetic flux density and effective permeability and commercially produce SMD core at low raw material or process cost. CONSTITUTION: The method comprises a coating process of uniformly coating the binder on the surface of the alloy powder by mixing a binder dissolved into organic solvent or water with Fe-Si alloy powder comprising 90 to 97 wt.% of Fe and 2 to 10 wt.% of Si; and a press molding process of molding an SMD core by pressing the coated alloy powder to a molding pressure of 15 ton/cm¬2 or less, wherein the method further comprises a heat treatment process of heat treating the press molded SMD core in the temperature range of 400 to 800 deg.C at a non-oxidative or reductive gas atmosphere for 10 to 120 minutes, and wherein polyimide or water glass is used as the binder, and content of the binder is 0.2 to 2.0 wt.% for the total weight of binder and Fe-Si alloy powder.