Method of manufacturing magnetic material
AssigneeNational Institute of Advanced Industrial Science and Technology
InventorsAsaya Fujita, Kimihiro Ozaki
Life of this patent
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Abstract
A method of manufacturing a magnetic material, includes a surface oxides decreasing step of decreasing surface oxides of an iron powder; a powder-molded body forming step of mixing the iron powder whose surface oxides are already decreased obtained by the surface oxides decreasing step, and a compound powder “A” constituted by a La element and a Si element, and compressing and molding the obtained mixture powder; and a sintered body forming step of preparing a sintered body from the powder-molded body obtained by the powder-molded body forming step, by a solid phase reaction under vacuum atmosphere.
Claims3
A method of manufacturing a magnetic material, comprising:
- a surface oxides decreasing step of decreasing surface oxides of an iron powder;
- a powder-molded body forming step of mixing the iron powder whose surface oxides are already decreased obtained by the surface oxides decreasing step, and a compound powder “A” constituted by a La element and a Si element, and compressing and molding the obtained mixture powder;
- and
- a sintered body forming step of preparing a sintered body from the powder-molded body obtained by the powder-molded body forming step, by a solid phase reaction under vacuum atmosphere,
- wherein the surface oxides decreasing step includes
- an iron powder placing step of placing the iron powder in a heating chamber of an electric furnace,
- an evacuation step of evacuating the heating chamber to be vacuum, after the iron powder placing step, and
- after the evacuation step, a surface reduction treatment step of performing a surface reduction treatment of the iron powder by heating the heating chamber to process temperature greater than or equal to 600° C. and less than or equal to 650° C., and also exposing the iron powder to hydrogen gas to obtain the iron powder whose surface oxides are already decreased.
A method of manufacturing a magnetic material comprising:
- an iron ingot forming step of forming an iron ingot by melting and degassing electrolytic iron;
- a grinding step of grinding the iron ingot obtained by the iron ingot forming step to obtain an iron powder whose surface oxides are decreased;
- a powder-molded body forming step of mixing the iron powder whose surface oxides are decreased, and a compound powder “A” constituted by a La element and a Si element, and compressing and molding the obtained mixture powder;
- and
- a sintered body forming step of preparing a sintered body from the powder-molded body obtained by the powder-molded body forming step, by a solid phase reaction under vacuum atmosphere.
Dependencies are inferred from the claim text.