Patent US4687510A successfully refreshed from Google Patents.
US4687510A
Expired / Lapsed
US
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Method for making ultrafine metal powder
Assignee: Osram Sylvania Inc
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Filing: 1986-02-10
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Granted: 1987-08-18
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Expires: 2006-02-10
Abstract
Abstract A fine aluminum metallurgical powder suitable for compacting and sintering into densified articles which includes a dispersed phase is produced by directing a stream of molten droplets at a repellent surface to produce smooth surfaced and melt solidified particles having an average particle size of less than about ten micrometers.
Inventors
- 👤 Richard F. Cheney
- 👤 Richard H. Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 23:34
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/06; B22F9/08; B22F9/082; B22F9/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
A process for producing a densified aluminum powder comprising forming a flowable agglomerated powder consisting essentially of aluminum and less than 10 atomic weight percent of hardness enhancing additives, entraining said agglomerated powder to a powder in a high pressure gas for transporting said powder to a plasma torch, creating a plasma in said gas and heating entrained powder to a molten condition to form a high velocity stream of molten metal droplets comprising aluminum and an additional discrete phase forming component, said stream being discharged from said torch at a speed greater than 200 meters per second directing said stream toward a repellant surface, fragmenting said molten droplets upon impact with said surface to form molten fragmented portions, rebounding said molten fragmented portions from said surface and cooling said fragmented portions to form a powder comprising particles less than about ten micrometers with smooth surfaces.
Claim 2
Dependent Claim
146 words
A process for producing a densified aluminum powder comprising forming a flowable agglomerated powder consisting essentially of aluminum and less than 10 atomic weight percent of hardness enhancing additives, entraining said agglomerated powder to a powder in a high pressure gas for transporting said powder to a plasma torch, creating a plasma in said gas and heating entrained powder to a molten condition to form a high velocity stream of molten metal droplets comprising aluminum and an additional discrete phase forming component, said stream being discharged from said torch at a speed greater than 200 meters per second directing said stream toward a repellant surface, fragmenting said molten droplets upon impact with said surface to form molten fragmented portions, rebounding said molten fragmented portions from said surface and cooling said fragmented portions to form a powder comprising particles less than about ten micrometers with smooth surfaces.
References Cited (Backward Citations)
US4592781A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-17 | 1991-02-16 | 1991-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-17 | 1995-02-16 | 1995-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-17 | 1999-02-16 | 1999-08-18 | $7700.00 | Window Closed / Lapsed |