Rare earth anisotropic hard magnetic material and processes...

Details Rare earth anisotropic hard magnetic material and processes... Rare earth anisotropic hard magnetic material and processes...

2011-08-16

2011-08-16

Sheehan, John P (Department: 1736)

Metal treatment

Stock

Magnetic

C148S101000

Reexamination Certificate

active

07998283

ABSTRACT:
The disclosure provides a rare earth anisotropic hard magnetic material, which has, on atomic percent basis, a composition of (Sm1-αRα)xFe100-x-y-zMyIz, wherein, R is Pr alone or a combination of Pr with at least one rare earth element selected from the group consisting of La, Ce, Nd, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y; M is at least one element selected from the group consisting of Si, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Nb, Mo, Al, and Zr; I is N alone or a combination of N and C; 0.01≦α≦0.30; 7≦x≦12, 0.01≦y≦8.0, 6≦z≦14.4, and which anisotropic rare earth hard magnetic material is crystallized in a Th2Zn17-type structure, of which crystalline grains are in a flake shape with a gain size ranging from 1 to 5 μm, and c-axis of the crystalline grains, an easy magnetization direction, being oriented along the minor axis of the flake crystalline grains. The disclosure also provides a process for producing the powdery rare earth anisotropic hard magnetic material and a process for producing anisotropic calender flexible magnet.

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Yang, Y. et al. Neutron Diffraction Study of Ternary Nitrides of the Type R2Fe17Nx, pp. 6018-6020, J. Appl. Phys. 70 (10), Nov. 15, 1991, American Institute of Physics.

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