To provide material powder, which contains soft magnetic powder, a binder resin, and lubricant, has electric resistance capable of restraining an eddy current among the soft magnetic powder particles and is capable of forming a dust core that has high mechanical strength and magnetic properties at a normal and high temperature and to provide a high-performance dust core using the material powder and a method of manufacturing the dust core.
The dust core powder contains soft magnetic powder, phenolic resin fine powder, and a reactive lubricant. It is preferable that the dust core powder contains the phenolic resin fine powder which is 30 μm or below in an average grain diameter and has a methylol group in a molecule and the reactive lubricant which possesses a hydroxyl group, an epoxy group, or a carboxyl group as a reactive functional group. The high-performance dust core is formed by the use of the above dust core powder, and the method of manufacturing the dust core is provided.
COPYRIGHT: (C)2004,JPO
Keifumi Hojo
Kazuhisa Fujisawa
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Etsushi Kotani