Nano-composite magnet, quenched alloy for nano-composite...

Details Nano-composite magnet, quenched alloy for nano-composite... Nano-composite magnet, quenched alloy for nano-composite...

2011-08-02

2011-08-02

Sheehan, John P (Department: 1736)

Metal treatment

Stock

Magnetic

C148S301000, C148S101000, C148S121000

Reexamination Certificate

active

07988797

ABSTRACT:
A nanocomposite magnet according to the present invention has a composition represented by the general formula: RxQyMz(Fe1-mTm)bal, where R is at least one rare-earth element, Q is at least one element selected from the group consisting of B and C, M is at least one metal element that is selected from the group consisting of Al, Si, Ti, V, Cr, Mn, Cu, Zn, Ga, Zr, Nb, Mo, Ag, Hf, Ta, W, Pt, Au and Pb and that always includes Ti, and T is at least one element selected from the group consisting of Co and Ni. The mole fractions x, y, z and m satisfy the inequalities of 6 at %≦x<10 at %, 10 at %≦y≦17 at %, 0.5 at %≦z≦6 at % and 0≦m≦0.5, respectively. The nanocomposite magnet includes a hard magnetic phase and a soft magnetic phase that are magnetically coupled together. The hard magnetic phase is made of an R2Fe14B-type compound, and the soft magnetic phase includes an α-Fe phase and a crystalline phase with a Curie temperature of 610° C. to 700° C. (ω phase) as its main phases.

REFERENCES:
patent: 2002/0017339 (2002-02-01), Kanekiyo et al.
patent: 2002/0117235 (2002-08-01), Kanekiyo et al.
Shigemoto et al.; “Nano-composite magnet, quenched alloy for nano-composite magnet, and method for producing them and method for distinguishing them”; U.S. Appl. No. 10/596,371, filed Jun. 9, 2006.

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