| 摘要 |
A film composed of a metal or a semimetal is formed on a surface of a soft magnetic powder including iron and oxygen (in step S102). In this case, a silicon-containing film is desirably formed on a surface of the film. Next, compaction is performed on the soft magnetic powder, so that a green compact is obtained (in step S103). Since the film is a metal film or a semimetal film having a high ductility, the density of the green compact produced by the compaction can be higher, and generation of damage, such as cracks or the like, can be prevented in the film. The effects can be also obtained in a case of formation of the silicon-containing film. Next, the green compact is subjected to heating, so that a surface and an interface of the soft magnetic powder of the green compact are oxidized, so that an insulation film is formed (in step S104). Generation of eddy current loss can be prevented by the oxide film. As a result, productivity and magnetic properties can be improved. |
