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US 2013/0076184 A1Published application
Permanent magnet and manufacturing method thereof, and motor and generator using the same
AssigneeKabushiki Kaisha Toshiba
InventorsYosuke Horiuchi, Shinya Sakurada, Tsuyoshi Kobayashi, Keiko Okamoto, Masaya Hagiwara
Life of this patent
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Abstract
In one embodiment, a permanent magnet includes a composition represented by RpFeqMrCusCo100-p-q-r-s (R: rare earth element, M: at least one element selected from Zr, Ti and Hf, 10≦p≦13.5 atomic %, 28≦q≦40 atomic %, 0.88≦r≦7.2 atomic %, 4≦s≦13.5 atomic %), and a metallic structure in which a composition region having an Fe concentration of 28 mol % or more is a main phase. A Cu concentration in the main phase is 5 mol % or more.
Claims10
A permanent magnet, comprising:
- a composition represented by a composition formula:
- RpFeqMrCusCo100-p-q-r-s
- where, R is at least one element selected from rare earth elements,
- M is at least one element selected from Zr, Ti and Hf,
- p is a number satisfying 10≦p≦13.5 atomic %,
- q is a number satisfying 28≦q≦40 atomic %,
- r is a number satisfying 0.88≦r≦7.2 atomic %,
- s is a number satisfying 4≦s≦13.5 atomic %;
- and
- a metallic structure in which a composition region having an Fe concentration of 28 mol % or more is a main phase,
- wherein a Cu concentration in the main phase is 5 mol % or more.
8 more elements
A method for manufacturing a permanent magnet, comprising:
- preparing an alloy powder having a composition represented by a composition formula:
- RpFeqMrCusCo100-p-q-r-s
- where, R is at least one element selected from rare earth elements,
- M is at least one element selected from Zr, Ti and Hf,
- p is a number satisfying 10≦p≦13.5 atomic %,
- q is a number satisfying 28≦q≦40 atomic %,
- r is a number satisfying 0.88≦r≦7.2 atomic %,
- s is a number satisfying 4≦s≦13.5 atomic %;
- press-forming the alloy powder in a magnetic field to form a pressed powder body;
- sintering the pressed powder body at a temperature TS satisfying TM—50<TS<TM, where TM is a melting start temperature (° C.) of a low melting M-rich phase in the alloy powder, to form a sintered body;
- performing a solution treatment to the sintered body;
- and
- performing an aging treatment to the sintered body after the solution treatment.
10 more elements
Dependencies are inferred from the claim text.