Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Reexamination Certificate
2005-03-08
2005-03-08
Sheehan, John P. (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
C419S013000
Reexamination Certificate
active
06863742
ABSTRACT:
A bulk anisotropic rare earth permanent magnet consists essentially of R, Fe or Fe and Co, and N, wherein R is selected from rare earth elements inclusive of Y and contains Sm as a main component, and has a primary phase of Th2Zn17type rhombohedral crystal structure, a density of at least 90% of the true density, and unidirectionally oriented C-axis. By electric conduction hot pressing of SmFeN base powder under rapid heating and rapid cooling conditions, the powder can be worked into the anisotropic bulk magnet without decomposing the 2-17 phase.
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English language translation of Japanese document No. 06-120060.*
English language translation of Japanese document No. 2000-294415 Oct. 20, 2000.*
English language translation of Japanese document No. 6-224017, Aug. 12, 1994.*
English language translation of Japanese document No. 06-20060, Oct. 1, 1992.*
Coey, J.M.D. et al., Journal of Magnetism and Magnetic Materials, 87(1990), L251-L254.
Shen, et al.,Journal of Magnetism and Magnetic Materials, vol. 162, 1996, pp. 265-270.
Sheehan John P.
Shin-Etsu Chemical Co. , Ltd.
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