Process for Producing Magnetic Powder and Process for Producing Dust Core
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United States of America Patent
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Issued Date -
Apr 9, 2009
app pub date -
May 29, 2007
filing date -
May 31, 2006
priority date (Note) -
Abandoned
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Abstract
A process for producing a magnetic powder which is sufficiently reduced in core losses such as iron loss and hysteresis loss and has sufficient strength; and a process for producing a dust core. The process for magnetic powder production comprises using a magnetic-material powder produced by water atomization as a raw powder and subjecting the powder to spheroidizing in which a mechanical impact is applied to the powder to spheroidize the powder particles. After the spheroidizing, the powder is subjected to a grain enlarging treatment in which the powder is annealed at a temperature not lower than the austenite transformation point. The process for dust core production comprises compacting the magnetic powder thus produced.
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