Ferromagnetic powder for dust cores, dust core, and dust core fabrication process
AssigneeTDK Corporation
InventorsHideharu Moro, Takeo Tsukada, Katsuhiko Wakayama
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Abstract
A dust core ferromagnetic powder comprises a ferromagnetic metal powder, an insulating material, and a lubricant. The insulating material comprises a phenol resin and/or a silicone resin, and the lubricant comprises at least one compound selected from the group consisting of magnesium stearate, calcium stearate, strontium stearate, and barium stearate. It is possible to achieve a dust core having high saturation magnetic flux density, low losses, and satisfactory permeability with its dependence on frequency being improved.
Claims14
A dust core ferromagnetic powder comprising a ferromagnetic metal powder, an insulating material, a sol, and a lubricant, wherein:
- said insulating material comprises a phenol resin and/or a silicone resin, and
- said sol is selected from the group consisting of titanium oxide sol, zirconium oxide sol, and mixtures thereof, and
- said lubricant comprises at least one compound selected from the group consisting of magnesium stearate, calcium stearate, strontium stearate, and barium stearate.
A dust core fabrication process which comprises steps of:
- subjecting a dust core ferromagnetic powder comprising a ferromagnetic metal powder, an insulating material, and a lubricant, wherein said insulating material comprises a phenol resin and/or a silicone resin, and said lubricant comprises at least one compound selected from the group consisting of magnesium stearate, calcium stearate, strontium stearate, and barium stearate to compression molding to form a ferromagnetic core compact, and
- thermally treating the ferromagnetic core compact at 550 to 850.degree. C.
A dust core ferromagnetic powder comprising a ferromagnetic metal alloy powder, an insulating material, and a lubricant, wherein:
- said insulating material comprises a phenol resin and/or a silicone resin, and
- said lubricant comprises at least one compound selected from the group consisting of magnesium stearate, calcium stearate, strontium stearate, and barium stearate.
A dust core ferromagnetic powder comprising a ferromagnetic metal powder, an insulating material, and a lubricant, wherein:
- said insulating material comprises a phenol resin and/or a silicone resin, and
- said lubricant comprises at least one compound selected from the group consisting of magnesium stearate, strontium stearate, and barium stearate.
Dependencies are inferred from the claim text.