US4240824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making nickel or cobalt powder with precipitates
Assignee: SCM Metal Products Inc
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Filing: 1979-10-04
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Granted: 1980-12-23
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Expires: 1999-10-04
Abstract
Abstract A boron-containing nickel or cobalt spray-and-fuse self-fluxing alloy powder contains hard precipitates of chromium boride and, optionally, chromium carbide which are internally precipitated from a melt of said alloy. Such alloy powder is made by atomizing the melt at about the temperature at which the melt is viscous.
Inventors
- 👤 Larry N. Moskowitz
- 👤 Erhard Klar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:11
CPC Classifications
C; C23; C23C; C23C4/00; C23C4/04; C23C4/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
76 words
A process for making a boron-containing nickel or cobalt spray-and-fuse, self-fluxing alloy powder which comprises: (a) forming a melt of boron- and chromium-containing nickel or cobalt alloy; (b) cooling said melt so that precipitates of chromium carbide and/or chromium boride result in the alloy powder product, at least about 5% of said precipitates by volume of said powder having a particle size of at least about 10 microns; (c) finely dividing said melt into alloy powder.
Claim 2
Dependent Claim
76 words
A process for making a boron-containing nickel or cobalt spray-and-fuse, self-fluxing alloy powder which comprises: (a) forming a melt of boron- and chromium-containing nickel or cobalt alloy; (b) cooling said melt so that precipitates of chromium carbide and/or chromium boride result in the alloy powder product, at least about 5% of said precipitates by volume of said powder having a particle size of at least about 10 microns; (c) finely dividing said melt into alloy powder.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein step (b) comprises cooling said melt to within about 100° F. above the temperature at which said alloy melt becomes viscous.
Claim 4
Dependent Claim
17 words
The process of claim 2 wherein step (c) is atomizing said alloy melt to form alloy powder.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein step (c) is shotting said melt and attrition milling said shot to form alloy powder.
Claim 6
Dependent Claim
37 words
The process of claim 1 further comprising blending said alloy powder with conventionally atomized powder, at least about 5% of said precipitates by volume of said blend having a particle size of at least about 10 microns.
Claim 7
Dependent Claim
42 words
The process of claim 2 wherein at least a fraction of said precipitates are larger in particle size than an alloy powder atomized at a temperature significantly greater than about 100° F. above the temperature at which said alloy melt becomes viscous.
Claim 8
Dependent Claim
27 words
The process of claim 1 wherein step (b) comprises cooling said melt to within about 50° F. above the temperature at which said alloy melt becomes viscous.
Claim 9
Dependent Claim
25 words
The process of claim 1 wherein at least about 5% of said precipitates by volume have a particle size of at least about 10 microns.
Claim 10
Dependent Claim
17 words
The process of claim 1 wherein said precipitates range from about 10 microns to about 50 microns.
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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) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |