Method of manufacturing magnets
AssigneesKorea Research Institute of Standard and Science, Mando Machinery Corporation
InventorsYoon-Bae Kim, Chang-Suk Kim, Tai-Seung Chung, Kil-Soo An
Life of this patent
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Abstract
A RE-TM-B magnet is produced by employing a circular tube placed between a upper punch and a lower punch, wherein a magnetic powder is loaded. After the loading, the powder is hot pressed in the tube by the action of the upper punch at a temperature of 400.degree. to 1000.degree. C. to produce an isotropic magnet compact. Subsequently, the compact may be hot worked at a temperature of 400.degree. to 1000.degree. C. to obtain an anisotropic magnet, if desired.
Claims13
A method of manufacturing a magnet containing one or more rare earth elements, one or more transition metals and boron by employing a pressing apparatus having at least one pressing member, which comprises the steps of:
- (a) loading a magnetic powder material containing said one or more rare earth elements, one or more transition metals and boron into a tubular member having a height, the magnetic powder material being loaded to a height that is the same as the height of the tubular member;
- and
- (b) hot pressing and hot working the magnetic powder material and the tubular member together by the action of one stroke of the pressing member at a temperature ranging from 400.degree. to 1000.degree. C. to densify the magnetic powder material into the magnet, said hot working providing magnetic anisotropy to the magnet.
A method of manufacturing a magnet containing one or more rare earth elements, one or more transition metals and boron by employing a first and a second pressing apparatus, and each pressing apparatus having at least one pressing member, which comprises the steps of:
- (a) loading a magnetic powder material containing said one or more rare earth elements, one or more transition metals and boron into a tubular member;
- (b) hot pressing the powder in the tubular member by the action of the pressing member in the first pressing apparatus at a temperature ranging from 400.degree. to 1000.degree. C. to densify the powder into a magnetic compact;
- (c) removing the portion of the tubular member which goes beyond the height of the magnetic compact;
- and
- (d) hot working the magnetic compact and the tubular member together by the action of the pressing member in the second pressing apparatus at a temperature ranging from 400.degree. to 1000.degree. C. to provide magnetic anisotropy thereto.
A method of manufacturing an anisotropic magnet containing one or more rare earth elements, one or more transition metals and boron by employing a pressing apparatus having at least one pressing member, which comprises the steps of:
- (a) inserting an isotropic magnet compact containing said one or more rare earth elements, one or more transition metals and boron into a tubular member;
- and
- (b) hot working the compact and the tubular member together by the action of the pressing member at a temperature ranging from 400.degree. to 1000.degree. C. to deform the compact plastically into the anisotropic magnet.
Dependencies are inferred from the claim text.