Iron-based soft magnetic powder for dust core, method for production thereof, and dust core
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United States of America Patent
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May 21, 2013
Grant Date -
Mar 4, 2010
app pub date -
Aug 2, 2007
filing date -
Sep 11, 2006
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Abstract
An iron-based magnetic powder for dust cores has layers of phosphoric acid-based film and silicone resin film sequentially formed on the surface thereof. The phosphoric acid-based film contains at least one element selected from the group consisting of Co, Na, S, Si, and W. The iron-based powder effectively keeps insulation among iron powder particles, excels in mechanical strength even though the amount of insulating material is reduced due to achieve high-density forming, and exhibits good thermal stability necessary for electrical insulating properties even after high-temperature heat treatment.
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