US4925501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expolosive compaction of rare earth-transition metal alloys in a fluid medium
Assignee: Motors Liquidation Co
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Filing: 1988-03-03
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Granted: 1990-05-15
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Expires: 2008-03-03
Abstract
Abstract This invention relates to a method of making large, fully dense compacts of substantially amorphous to very finely crystalline rare earth alloys using explosive compaction and hot working.
Inventors
- 👤 Elizabeth F. Harasek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:24
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0253; B; B22; B22F; B22F3/00; B22F3/02; B22F3/08; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; H01F1/0555; H01F1/0556; H01F1/057; H01F1/0571; H01F1/0575; H01F1/0576
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
148 words
A method of making an alloy body comprising one or more rare earth metals including at least one of Nd, Pr and Sm, one or more transition metals including at least one of Co and Fe and optionally B, said method comprising dispersing particles of said alloy having an average crystal grain size less than about 400 nM in a container, providing a bomb comprising a confined chamber having first and second chamber portions, positioning said container in sealing relation between said first and second chamber portions, evacuating said second chamber portion, locating an explosive charge and a fluid in said first chamber portion, exploding said charge to cause consolidation of said particles to substantially full density and flow of said consolidated particles into said second chamber and annealing said consolidated body as necessary to arrive at a crystal structure commensurate with creation of permanent magnetic properties therein.
Claim 2
Independent Claim
148 words
A method of making an alloy body comprising one or more rare earth metals including at least one of Nd, Pr and Sm, one or more transition metals including at least one of Co and Fe and optionally B, said method comprising dispersing particles of said alloy having an average crystal grain size less than about 400 nM in a container, providing a bomb comprising a confined chamber having first and second chamber portions, positioning said container in sealing relation between said first and second chamber portions, evacuating said second chamber portion, locating an explosive charge and a fluid in said first chamber portion, exploding said charge to cause consolidation of said particles to substantially full density and flow of said consolidated particles into said second chamber and annealing said consolidated body as necessary to arrive at a crystal structure commensurate with creation of permanent magnetic properties therein.
Claim 3
Dependent Claim
19 words
The method of claim 1 where the alloy consists predominatly of a RE 2 TM 14 B 1 phase.
Claim 4
Dependent Claim
22 words
The method of claim 1 where the alloy consists predominatly of a RE 2 TM 17 or RE 1 TM 5 phase.
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) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |