| 摘要 |
PURPOSE:To obtain a magnetic core wherein its permeability at a high frequency is high and its eddy current loss is small by a method wherein an electrical insulation treatment is executed to the surface of flake-shaped high- permeability alloy powders, the powders are kneaded with an organic binder, films in which flake faces of the powders are arranged inside a film face are obtained and the films are laminated and bonded to each other. CONSTITUTION:An electrical insulation treatment is executed to the surface of flake-shaped high-permeability alloy powders whose aspect ratio is two or higher. The powders are kneaded with an organic binder or with the organic binder to which an inorganic binder has been added. After that, a film in which flake faces of the flake-shaped high-permeability allay powders have been arranged inside a film face is obtained. Then, a magnetic core is manufactured from a molded body in which two or more films have been laminated and bonded to each other. For example, a kneaded substance is changed to a film 2 having a thickness of 20 by using a drum 1 by a casting method; the film is rolled up on a drum 3. One hundred sheets of films 2 are laminated; they are compression-bonded at 150 deg.C; they are molded after that, a binder is removed and a heat treatment is executed. |
