Method for preparation of permanent magnet

Details Method for preparation of permanent magnet Method for preparation of permanent magnet

2007-07-17

2007-07-17

Sheehan, John P. (Department: 1742)

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

C148S103000, C419S011000, C419S012000, C419S014000

Reexamination Certificate

active

10470490

ABSTRACT:
A blended powder including a first powder containing an R2T14B phase as a main phase, and a second powder containing an R2T17phase at 25 wt % or more of the whole is prepared. Herein, R is at least one element selected from the group consisting of all rare-earth elements and Y (yttrium), T is at least one element selected from the group consisting of all transition elements, and Q is at least one element selected from the group consisting of B (boron) and C (carbon). The blended powder is sintered, so as to manufacture a permanent magnet having a structure in which a rare-earth element included in the second powder is concentrated in a grain surgace region of a main phase.

REFERENCES:
patent: 4369075 (1983-01-01), Nobuo et al.
patent: 4849035 (1989-07-01), Stadelmaier et al.
patent: 5387291 (1995-02-01), Kaneko et al.
patent: 5405455 (1995-04-01), Kusunoki et al.
patent: 5595608 (1997-01-01), Takebuchi et al.
patent: 6139765 (2000-10-01), Kitazawa et al.
patent: 0 237 416 (1987-09-01), None
patent: 06-096928 (1994-04-01), None
patent: 07-078709 (1995-03-01), None
patent: 07-245206 (1995-09-01), None
patent: 09-283312 (1997-10-01), None
Kianvash et al., “Densification of a Nd13Fe78NbCoB7-Type Sintered Magnet by (Nd, DY)-Hydride Additions Using a Powder Blending Technique”, Journal of Alloys and Compounds, vol. 287, 1999, pp. 206-214.
Ohnashi et al., “Effects of Rare Earth Oxide Addition on NdFeB Magnets”, J. Magn. Soc. Japan, vol. 11, No. 2, 1987, pp. 235-238 (Japanese language with ABSTRACT).
Velicescu et al., “Dy-Distribution in the Grains of High-Energy (Nd,Dy)-Fe-B Magnets”, IEEE Transactions on Magnetics, vol. 31, No. 6, Nov. 1995, pp. 3623-3625.

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