| 摘要 |
In the present invention, according to a method for preparing a high-permeability amorphous compressed powder core having a small variable range of effective permeability even at a high frequency band by means of high-temperature molding, it is possible to prepare an amorphous compressed powder core having a small variable range of effective permeability even at a high frequency band, an effective permeability of 75 or more, and a significantly small core loss of 300 mW/cc or less under conditions in which the frequency is 50 KHz and the induced magnetic flux is 1,000 Gauss, by coating twice, i.e. with phosphoric acid coating and polyimide-based coating as insulators between powders, and then automatic compression molding at a temperature of about 200 to 550′C by using molybdenum disulfide (MoS2) or graphite powder which can be lubricated at a high temperature. |
