METHOD FOR PRODUCING COMPOSITE MAGNETIC BODY, MAGNETIC POWDER, COMPOSITE MAGNETIC BODY AND COIL COMPONENT
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United States of America Patent
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Issued Date -
Oct 8, 2020
app pub date -
Mar 19, 2018
filing date -
Mar 31, 2017
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Abstract
A method for producing a composite magnetic body includes: pressure molding a metal magnetic material into a predetermined shape, the metal magnetic material being an Fe—Si-based metal magnetic material; performing a primary heat treatment of heating the metal magnetic material in an atmosphere with a first oxygen partial pressure to form an Si oxide coating film on a surface of the metal magnetic material; and performing a secondary heat treatment of heating the metal magnetic material that has undergone the primary heat treatment in an atmosphere with a second oxygen partial pressure, which is higher than the first oxygen partial pressure, to form an Fe oxide layer at least partially on a surface of the Si oxide coating film.
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