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US 2013/0092867 A1Published application
Method for producing sintered rare-earth magnet, sintered rare-earth magnet, and material for same
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTetsuya Shoji, Noritsugu Sakuma, Hidefumi Kishimoto
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Abstract
A method for producing a sintered rare-earth magnet characterized by sintering a raw material that includes a ribbon-shaped polycrystalline phase with an average grain size of 10 to 200 nm fabricated by rapid solidification of an alloy melt having a rare-earth magnet composition, and a low-melting point phase formed on the surface of the polycrystalline phase and having a melting point lower than the polycrystalline phase.
Claims9
A method for producing a sintered rare-earth magnet by comprising:
- preparing a ribbon composed of a polycrystalline phase including crystal grains with an average grain size of 10 to 200 nm by rapidly solidificating of an alloy melt having a rare-earth magnet composition;
- forming a low-melting point phase having a melting point lower than the polycrystalline phase on the surface of the ribbon;
- and
- sintering a raw material composed of the ribbon and the low-melting point phase.
1 more element
A raw material for a sintered rare-earth magnet comprising:
- a ribbon composed of a polycrystalline phase including crystal grains with an average grain size of 10 to 200 nm;
- and
- a low-melting point phase formed on the surface of the ribbon and having a melting point lower than the polycrystalline phase.
Dependencies are inferred from the claim text.