METHOD FOR MANUFACTURING SOFT MAGNETIC CORE OF COMPOSITE METAL POWDER HAVING EXCELLENT DIRECT CURRENT OVERLAP CHARACTERISTIC

摘要

PURPOSE: A method for manufacturing a soft magnetic core of composite metal powder is provided to manufacture the soft magnetic core of composite metal powder having enhanced plastic deformable ability upon molding of the core, excellent magnetic permeability, excellent direct current overlap characteristic and good core loss. CONSTITUTION: Sendust alloy powder comprised of 7 to 13% Si, 3 to 9% Al and the balance of Fe is prepared. Composite metal powder is made by adding at least one of Permalloy powder comprised of 45 to 55% Ni and the balance of Fe and Moly Permalloy powder having good ductility and high magnetic permeability to the Sendust powder in the amount of 1 to 50% by total weight %. The composite metal powder obtained as such is coated for insulation by a mixed ceramic. A molding lubricant is subsequently added to and mixed with it. Then, a core is molded and the molded core is heat-treated.