US4152178A
Expired / Lapsed
US
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Sintered rare earth-iron Laves phase magnetostrictive alloy product and preparation thereof
Assignee: United States Department of Energy
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Filing: 1978-01-24
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Granted: 1979-05-01
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Expires: 1998-01-24
Abstract
Abstract A sintered rare earth-iron Laves phase magnetostrictive alloy product characterized by a grain oriented morphology. The grain oriented morphology is obtained by magnetically aligning powder particles of the magnetostrictive alloy prior to sintering. Specifically disclosed are grain oriented sintered compacts of Tb x Dy 1-x Fe 2 and their method of preparation. The present sintered products have enhanced magnetostrictive properties.
Inventors
- 👤 Manoochehr Malekzadeh
- 👤 Milton R. Pickus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:09
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; B; B22; B22F; B22F1/00; B22F1/14; C22C1/00; C22C1/04; C22C1/0433; C22C1/0441; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/0302; H01F1/0306; H10; H10N; H10N35/00; H10N35/80; H10N35/85
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
69 words
A magnetostrictive sintered product consisting essentially of a compact body compounded of particles of a rare earth-iron Laves phase magnetostrictive compound having the formula RFe 2 where R represents one or more rare earth metals and characterized by a grain oriented morphology achieved by aligning the particles under the influence of a magnetic field prior to sintering whereby the particles are oriented along the easy axis of magnetization thereof.
Claim 2
Dependent Claim
69 words
A magnetostrictive sintered product consisting essentially of a compact body compounded of particles of a rare earth-iron Laves phase magnetostrictive compound having the formula RFe 2 where R represents one or more rare earth metals and characterized by a grain oriented morphology achieved by aligning the particles under the influence of a magnetic field prior to sintering whereby the particles are oriented along the easy axis of magnetization thereof.
Claim 3
Dependent Claim
23 words
A magnetostrictive sintered product as in claim 1 wherein the rare earth-iron compound has its axis of easy magnetization along the [111] direction.
Claim 4
Dependent Claim
29 words
A magnetostrictive sintered product as in claim 2 wherein the rare earth-iron compound has the formula Tb x Dy 1-x Fe 2 wherein x is at least about 0.3.
Claim 5
Dependent Claim
13 words
A magnetostrictive sintered product as in claim 3 wherein x is about 0.3.
Claim 6
Independent Claim
79 words
A method for preparing an improved sintered rare earth-iron Laves phase magnetostrictive alloy product which comprises: providing a powder of a rare earth-iron Laves phase magnetostrictive compound having the formula RFe 2 where R represents one or more rare earth metals; subjecting the powder particles to a magnetic field sufficient to substantially align the particles; compressing the magnetically particles aligned to form a compact body while substantially maintaining the degree of magnetic alignment; and sintering the resulting compact body.
Claim 7
Independent Claim
79 words
A method for preparing an improved sintered rare earth-iron Laves phase magnetostrictive alloy product which comprises: providing a powder of a rare earth-iron Laves phase magnetostrictive compound having the formula RFe 2 where R represents one or more rare earth metals; subjecting the powder particles to a magnetic field sufficient to substantially align the particles; compressing the magnetically particles aligned to form a compact body while substantially maintaining the degree of magnetic alignment; and sintering the resulting compact body.
Claim 8
Dependent Claim
23 words
The method of claim 5 wherein the rare earth-iron Laves phase magnetostrictive compound has its axis of easy magnetization along the [111] direction.
Claim 9
Dependent Claim
29 words
The method of claim 6 wherein the rare earth-iron Laves phase magnetostrictive compound has the formula Tb x Dy 1-x Fe 2 wherein x is at least about 0.3.
Claim 10
Dependent Claim
10 words
The method of claim 7 wherein x is about 0.3.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |