To provide a method for manufacturing a complex sintered dust core having high magnetic characteristics, high electrical resistance, and high mechanical strength.
When a magnetic core is fabricated by forming complex powder of Sendust powder and PC permalloy powder and treated it by heat, the heat treatment temperature is set at an intermediate temperature of the start of sintering. Then, the PC permalloy powder with a low sintering start temperature is completely sintered, and the Sendust powder will not be sintered. Along with the sintering of the PC permalloy powder, the density is made higher and the magnetic characteristics such as magnetic permeability can be enhanced. At the same time, the electrical resistance is kept higher than the case, in which the whole powder constituting the magnetic core is sintered, because the Sendust powder is kept as independent particles. In addition, the PC permalloy powder having almost a uniform distribution is sintered, and the magnetic core is constituted by an almost uniform organization, so that mechanical strength can be enhanced.
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