Method for preparing iron system soft magnetic sintered body
AssigneeTDK Corporation
InventorsTeruo Mori, Norishige Yamaguchi, Katsuhiko Wakayama
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Abstract
An iron system soft magnetic sintered body is prepared by blending an iron powder with a powder of a metal or ferroalloy so as to give a desired chemical composition and subjecting the blend to mechanical alloying, thereby alloying at least a portion of the metal or ferroalloy with iron, followed by shaping and firing. Alternatively, the same is prepared by treating an iron system alloy powder of a desired chemical composition by a mechanical grinding process, followed by shaping and firing. Even when starting with relatively large mean particle size powder, the resulting sintered body has a high density and improved magnetic properties.
Claims20
A method for preparing an iron system soft magnetic sintered body comprising the steps of:
- blending an iron powder with at least one metal powder selected from metals to be alloyed with iron and ferroalloys so as to give a desired chemical composition,
- treating the blend by a mechanical alloying process, thereby alloying at least a portion of the metal with iron,
- shaping the blend into a compact, and
- firing the compact into an iron system soft magnetic sintered body,
- wherein the treatment by a mechanical alloying process is effected in the presence of a solid lubricant, and the solid lubricant is added in an amount of 0.1 to 5% by weight of the blend.
A method for preparing an iron system soft magnetic sintered body comprising the steps of:
- treating an iron system alloy powder of a desired chemical composition by a mechanical grinding process,
- shaping the powder into a compact, and
- firing the compact into an iron system soft magnetic sintered body,
- wherein the treatment by a mechanical grinding process is effected in the presence of a solid lubricant, and the solid lubricant is added in an amount of 0.1 to 5% by weight of the powder.
A method for preparing an iron system soft magnetic sintered body comprising the steps of:
- blending an iron powder with at least one metal powder selected from metals to be alloyed with iron and ferroalloys so as to give a desired chemical composition,
- treating the blend by a mechanical alloying process, thereby alloying at least a portion of the metal with iron,
- shaping the blend into a compact, and
- firing the compact into an iron system soft magnetic sintered body,
- wherein amorphous carbon is added in an amount of up to 0.5% by weight of the blend before or during the treatment by a mechanical alloying process.
A method for preparing an iron system soft magnetic sintered body comprising the steps of:
- treating an iron system alloy powder of a desired chemical composition by a mechanical grinding process,
- shaping the powder into a compact, and
- firing the compact into an iron system soft magnetic sintered body,
- wherein amorphous carbon is added in an amount of up to 0.5% by weight of the powder before or during the treatment by a mechanical grinding process.
Dependencies are inferred from the claim text.