Rare-earth antisotropic powders and magnets and their manufactur

Details Rare-earth antisotropic powders and magnets and their manufactur Rare-earth antisotropic powders and magnets and their manufactur

1990-07-18

1991-04-23

Hunt, Brooks H.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75230, 75246, 75252, 148103, 148108, 419 12, 419 23, 419 33, 419 37, 419 38, 419 43, 419 54, 419 57, 419 60, C22C 2914

Patent

active

050097067

ABSTRACT:
Rare-earth alloy anisotropic powders consist of, in atomic percent, over 12 percent and not more than 20 percent of R (R is at least one on neodymium and praseodymium or at least one of them and or more rare-earth elements), not less than 4 percent and not more than 10 percent of boron, not less than 0.05 percent and not more than 5 percent of copper and the rest that consists of iron and unavoidable impurities. Up to 20 percent of the iron contained is replaceable with cobalt. The alloy powders are made up of flat crystal grains having mean thickness h (the shortest measure), d not smaller than 0.01 .mu.m and not larger than 0.5 .mu.m and ratio d/h not smaller than 2, where d is the means measure of the grains taken at right angles to the widthwide direction thereof, and the alloy powders are magnetically anisotropic. Each rare-earth alloy anisotropic powder is prepared by melting an R-Fe-B-Cu alloy, putting thin ribbons prepared by quenching the melt or a powder prepared by grinding the thin ribbons in a metal container, hermetically sealing the metal container after replacing its inner atmosphere with a vacuum or an inert gas atmosphere, and rolling the thin ribbons or powder, together with the metal container, at a temperature not lower than 500.degree. C. and not higher than 900.degree. C. Rare-earth alloy anisotropic magnets are made by kneading and forming the rare-earth alloy anisotropic powders with not less than 10 percent and not more than 50 percent by volume of resin or by hot-compressing the rare-earth alloy anisotropic powders.

REFERENCES:
patent: 4810309 (1989-03-01), Coehoorn
patent: 4844754 (1989-07-01), Lee
patent: 4851058 (1989-07-01), Croat
patent: 4859255 (1989-09-01), Fujimura et al.
patent: 4863805 (1989-09-01), Suzuki et al.
patent: 4867809 (1989-09-01), Haverstick
patent: 4881986 (1989-11-01), Sato et al.
patent: 4892596 (1990-01-01), Chatterjee
patent: 4895607 (1990-01-01), Choong-Jin
patent: 4913745 (1990-04-01), Sato
patent: 4920009 (1990-04-01), Lee et al.
patent: 4925501 (1990-05-01), Harasek

Affiliated with

Also associated with

Rating

Rare-earth antisotropic powders and magnets and their manufactur does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Rare-earth antisotropic powders and magnets and their manufactur, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rare-earth antisotropic powders and magnets and their manufactur will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1619152