High performance rare earth-transition metal...

Details High performance rare earth-transition metal... High performance rare earth-transition metal...

1998-12-03

2001-08-14

Sheehan, John (Department: 1742)

Metal treatment

Stock

Magnetic

C148S303000

Reexamination Certificate

active

06273966

ABSTRACT:

This invention pertains to high performance magnetostrictive materials and, more particularly, to rare earth-transition metal giant magnetostrictive materials.
Rare earth-transition metal magnetostrictive materials have heretofore been provided. See, for example, U.S. Pat. No. 4,308,474. Methods for the manufacture of rare earth-transition metal magnetostrictive materials have also been provided. See, for example, U.S. Pat. Nos. 4,609,402, 4,770,704, 4,849,034 and 4,818,304. Current production methods for such giant magnetostrictive materials have required relatively low levels of impurities to ensure that the resultant alloy has suf f icient toughness for withstanding normal handling. For example, at least one manufacturer of such giant magnetostrictive materials has required that the rare earth starting materials have oxygen, nitrogen and carbon impurity levels of not greater than 6,011, 575 and 939, parts per million, respectively. There is, however, a need for a less expensive magnetostrictive material which exhibits a high level of magnetostrictive strain.
In general, it is an object of the present invention to provide a new and improved giant magnetostrictive material or alloy which provides a high level of magnetostrictive strain despite increased amounts of impurities in the raw materials for producing the alloy at a reduced cost.
Another object of the invention is to provide a giant magnetostrictive material of the above character having increased amounts of oxygen, nitrogen and carbon impurities in the raw materials.


REFERENCES:
patent: 4308474 (1981-12-01), Savage et al.
patent: 4609402 (1986-09-01), McMasters
patent: 4770704 (1988-09-01), Gibson et al.
patent: 4818304 (1989-04-01), Verhoeven et al.
patent: 4849034 (1989-07-01), Verhoeven et al.
patent: 5087291 (1992-02-01), Schmidt et al.
patent: 5110376 (1992-05-01), Kobayashi et al.
patent: 5223046 (1993-06-01), Kobayashi et al.
patent: 5529745 (1996-06-01), Mori et al.
patent: 0 827 219 A2 (1998-03-01), None
D.T. Peterson et al., “Strength of Terfenol-D,” (May 1, 1989) J. Appl. Phys. 65(9), pp. 3712-3713.

Affiliated with

Also associated with

Rating

High performance rare earth-transition metal... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High performance rare earth-transition metal..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High performance rare earth-transition metal... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2477373