| 摘要 |
PURPOSE: A method for producing the metallic powder core of E-typed weak magnetic property is provided to easily produce a metal mold for shaping by eliminating air gap while having small loss in core and smooth reducing rate in permeability. CONSTITUTION: A sand dust alloy powder is composed of 7-13wt% of Si, 3-9wt% of Al, and the remnant wt% of Fe. A permalloy power is composed of 45-55wt% of Ni and the remnant wt% of Fe. Then, a molly permalloy powder is composed of 2wt% of Mo, 80wt% of Ni, and the remnant wt% of Fe. One metallic powder among the three metallic powders is prepared for being insulating coated, shaped in high pressure, and heat treated in a reduction atmosphere. Thus, a metallic powder core(20) is produced. The E-typed core improves a direct current layering characteristic while reducing a winding cost by automating the winding using bobbin. Moreover, the raw cost and labor are reduced by omitting a surface processing process after sintering.
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