PRODUCTION METHOD OF RARE EARTH MAGNET AND PRODUCTION APPARATUS USED THEREFOR
First Claim
1. A method for producing a rare earth magnet, comprising:
- mixing a magnetic raw material powder containing Sm, Fe and N with a modifier powder containing metallic Zn to obtain a mixed powder,filling the mixed powder into a molding die to obtain a filled product,melting at least a part of the modifier powder in the filled product while applying a pressure of 20 MPa or less to the filled product or without applying a pressure to obtain an intermediate molded product, andsubjecting the intermediate molded product to liquid phase sintering at a pressure of 20 MPa or more to obtain a sintered body.
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Abstract
To provide a production method capable of enhancing the magnetic properties, particularly, the coercive force, of a Sm—Fe—N-based rare earth magnet and a production apparatus used therefor.
A method for producing a rare earth magnet, comprising mixing a magnetic raw material powder containing Sm, Fe and N with a modifier powder containing metallic Zn to obtain a mixed powder, filling the mixed powder into a molding die to obtain a filled product, melting at least a part of the modifier powder in the filled product while applying a pressure of 20 MPa or less to the filled product or without applying a pressure to obtain an intermediate molded product, and subjecting the intermediate molded product to liquid phase sintering at a pressure of 20 MPa or more to obtain a sintered body; and a production apparatus used therefor.
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Citations
11 Claims
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1. A method for producing a rare earth magnet, comprising:
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mixing a magnetic raw material powder containing Sm, Fe and N with a modifier powder containing metallic Zn to obtain a mixed powder, filling the mixed powder into a molding die to obtain a filled product, melting at least a part of the modifier powder in the filled product while applying a pressure of 20 MPa or less to the filled product or without applying a pressure to obtain an intermediate molded product, and subjecting the intermediate molded product to liquid phase sintering at a pressure of 20 MPa or more to obtain a sintered body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification