US4233062A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Atomization into a chamber held at reduced pressure
Assignee: Huntington Alloys Corp
•
Filing: 1978-08-09
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Granted: 1980-11-11
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Expires: 1998-08-09
Abstract
Abstract Gas content of atomized metal powder can be reduced by conducting the atomization process at subatmospheric pressure and maintaining evacuation during atomization process.
Inventors
- 👤 Richard J. Siddall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:35
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/06; B22F9/08; B22F9/082
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
85 words
In a process for the production of metal powder by atomization of a molten metal stream in which a gaseous medium is impinged there against, the improvement which comprises reducing the gas entrapment of the metal powder produced by conducting the atomization process at a subatmospheric pressure of about 0.5 bar (0.05 M Pa) or below during the atomization period in which said gaseous medium impinges against said molten metal stream and maintaining said subatmospheric pressure at said level until the process is substantially complete.
Claim 2
Dependent Claim
85 words
In a process for the production of metal powder by atomization of a molten metal stream in which a gaseous medium is impinged there against, the improvement which comprises reducing the gas entrapment of the metal powder produced by conducting the atomization process at a subatmospheric pressure of about 0.5 bar (0.05 M Pa) or below during the atomization period in which said gaseous medium impinges against said molten metal stream and maintaining said subatmospheric pressure at said level until the process is substantially complete.
Claim 3
Dependent Claim
19 words
A process in accordance with claim 1 in which the metal atomized is a nickel-, iron-, or cobalt-based alloy.
Claim 4
Dependent Claim
14 words
A process in accordance with claim 1 in which the atomizing gas is argon.
Claim 5
Dependent Claim
20 words
A process in accordance with claim 1 in which the pressure is maintained at 0.37 bar (0.037 MPa) or below.
Claim 6
Dependent Claim
34 words
A process in accordance with claim 3 in which the pressure is maintained below about 0.3 bar (0.03 MPa) and whereby the argon content of the metal powder produced is 0.2 ppm or less.
Claim 7
Dependent Claim
19 words
A process in accordance with claim 1 in which at least one water ring pump is used for evacuation.
Claim 8
Dependent Claim
8 words
Metal powder produced in accordance with claim 1.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |