Iron-based powder for powder metallurgy and method for producing iron-based powder for powder metallurgy
AssigneesSumitomo Electric Industries, Ltd., Sumitomo Electric Sintered Alloy, Ltd.
InventorsTomoyuki Ueno, Koji Yamada, Kazuya Takizawa, Yuki Adachi, Tetsuya Hayashi
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Abstract
An iron-based powder for powder metallurgy includes an iron-based powder and a composite oxide powder, and the composite oxide contains, by mass, from 15% to 30% Si, from 9% to 18% Al, from 3% to 6% B, from 0.5% to 3% Mg, from 2% to 6% Ca, from 0.01% to 1% Sr, and from 45% to 55% O.
Claims14
An iron-based powder for powder metallurgy, comprising an iron-based powder and a composite oxide powder,
- wherein the composite oxide contains, by mass:
- from 15% to 30% Si,
- from 9% to 18% Al,
- from 3% to 6% B,
- from 0.5% to 3% Mg,
- from 2% to 6% Ca,
- from 0.01% to 1% Sr, and
- from 45% to 55% O.
A method for producing an iron-based powder for powder metallurgy by mixing an iron-based powder with a composite oxide powder, the method comprising the steps of:
- heating a composite oxide containing, by mass:
- from 15% to 30% Si,
- from 9% to 18% Al,
- from 3% to 6% B,
- from 0.5% to 3% Mg,
- from 2% to 6% Ca,
- from 0.01% to 1% Sr, and
- from 45% to 55% 0 to a melting point of the composite oxide or higher and then performing cooling or rapid cooling to prepare a composite oxide frit;
- coarsely pulverizing the composite oxide frit to an average particle diameter of 20 or less to prepare a coarse powder;
- finely pulverizing the coarse powder to a predetermined particle diameter with an airflow pulverizer, which uses no grinding media, to prepare a fine powder;
- and
- mixing the fine powder with the iron-based powder by using a shear force mixer capable of breaking up aggregates of the fine powder.
Dependencies are inferred from the claim text.