| 摘要 |
PROBLEM TO BE SOLVED: To produce a soft magnetic material which satisfies requirements including a low iron loss, a high density, high strengths, and a high productivity on a high level. SOLUTION: The method for producing the soft magnetic material comprises the surface oxidation step of forming an oxide film on the surface of the surface of a powder of the soft magnetic material, the step of mixing the soft magnetic powder with a binder in a specified mixing ratio to make a moldable soft magnetic material, the press molding step of press-molding the moldable soft magnetic material into a specified shape, and the sintering step of sintering the press-molded soft magnetic powder to produce the soft magnetic material. In the surface oxidation step and the sintering step, a millimeter wave sintering apparatus (or a discharge plasma sintering apparatus) is used as a heating means. Then, the energy of the millimeter waves (or the discharge plasma) locally acts on the surface oxide part where the soft magnetic powder exhibits a high electric resistivity and locally heats the surface of the soft magnetic powder to a temperature near the melting temperature to accelerate the surface oxidation (oxide film formation) of the soft magnetic powder and sintering (diffusion and joint of oxide films). COPYRIGHT: (C)2004,JPO
|
