SOFT MAGNETIC CORE WITH LOW CORE-LOSS MANUFACTURED WITH PERMALLOY ALLOY POWDER

摘要

PURPOSE: A low loss soft magnetic core is provided to achieve improved soft magnetic characteristics, while reducing core loss and manufacturing costs. CONSTITUTION: A low loss soft magnetic core contains nickel 38 to 48 weight% and ferrum. The ferrum, ferrum-nickel alloy or ferrum and nickel are dissolved, and gas mixture of N2, He, Ne, Ar, Kr, Xe and Rn gases or water is injected into the resultant structure so as to obtain permalloy powder. Mechanical processes including a ball mill, horizontal mill, attrition mill and rod mill are performed to the permalloy powder. Subsequently, heat treatment is performed to the permalloy powder at the temperature of 700 to 1000 Deg.C for 4 to 15 hours, and the powder is coated an insulating material. The powder is formed into a core shape through the use of a press, and the core is heat treated at the temperature of 500 to 800 Deg.C. Subsequently, the core is coated with a protective material including polyester or epoxy resin.