US4602952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making a composite powder metallurgical billet
Assignee: Cooper Industries LLC
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Filing: 1985-04-23
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Granted: 1986-07-29
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Expires: 2005-04-23
Abstract
Abstract A process for producing a composite billet employing powder metallurgical techniques in which a first alloy powder of a preselected composition is compacted in a tubular container producing a preliminarily compacted tubular mass which thereafter is finished on the interior surface thereof to desired final dimensions. The resultant tubular mass is placed in a second container and the core thereof is filled with a powder of a desired second alloy composition and the contents are sealed. The second alloy powder is subsequently hot compacted to a density approaching 100 percent theoretical density without incurring any appreciable distortion or dimensional change of the tubular mass. Thereafter, the preliminary composite compacted billet is subjected under elevated temperature to an axial extrusion step producing a final composite extruded billet having a concentric outer layer of a first alloy and an inner core layer of a second alloy metallurgically bonded together.
Inventors
- 👤 Robert L. Greene
- 👤 James R. Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:03
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
192 words
A process for making a composite billet comprising an outer annular cylinder of a first alloy composition and an inner cylindrical core of a second alloy composition metallurgically bonded together as an integral densified mass comprising the steps of: (1) confining a first metal powder of a first alloy composition in an annular cylindrical container having an axial bore therethrough, (2) sealing and hot compacting the container and metal powder into a densified tubular mass having a centrally extending interior bore, (3) separating the container from at least the interior bore of the tubular mass and finishing the interior bore surface to prescribed dimensions, (4) enclosing the tubular mass in a second container and filling said interior bore with a second metal powder of a second alloy composition, (5) sealing and hot compacting the container and second metal powder without significant distortion of said tubular mass, (6) heating and extruding said container and said first and second metal powder therein through a die of reduced cross-sectional area effecting further densification and elongation thereof into an integral composite billet, and (7) thereafter removing the second container from the periphery of said composite billet.
Claim 2
Dependent Claim
192 words
A process for making a composite billet comprising an outer annular cylinder of a first alloy composition and an inner cylindrical core of a second alloy composition metallurgically bonded together as an integral densified mass comprising the steps of: (1) confining a first metal powder of a first alloy composition in an annular cylindrical container having an axial bore therethrough, (2) sealing and hot compacting the container and metal powder into a densified tubular mass having a centrally extending interior bore, (3) separating the container from at least the interior bore of the tubular mass and finishing the interior bore surface to prescribed dimensions, (4) enclosing the tubular mass in a second container and filling said interior bore with a second metal powder of a second alloy composition, (5) sealing and hot compacting the container and second metal powder without significant distortion of said tubular mass, (6) heating and extruding said container and said first and second metal powder therein through a die of reduced cross-sectional area effecting further densification and elongation thereof into an integral composite billet, and (7) thereafter removing the second container from the periphery of said composite billet.
Claim 3
Dependent Claim
31 words
The process as defined in claim 1 in which the particle size of said first metal powder and said second metal powder ranges from about 1 up to about 250 microns.
Claim 4
Dependent Claim
30 words
The process as defined in claim 1 in which the particle size of said first metal powder and said second metal powder ranges from about 10 to about 150 microns.
Claim 5
Dependent Claim
21 words
The process as defined in claim 1 in which said first metal powder and said second metal powder comprise a superalloy.
Claim 6
Dependent Claim
40 words
The process as defined in claim 1 in which step (1) and step (4) are performed to provide a loose packing density of the metal powder ranging from about 60 percent to about 70 percent of 100 percent theoretical density.
Claim 7
Dependent Claim
30 words
The process as defined in claim 1 in which step (2) is performed to provide a densified tubular mass of at least about 96 percent of 100 percent theoretical density.
Claim 8
Dependent Claim
30 words
The process as defined in claim 1 in which step (2) is performed to provide a densified tubular mass of at least about 99 percent of 100 percent theoretical density.
Claim 9
Dependent Claim
17 words
The process as defined in claim 1 in which step (2) is performed by hot isostatic pressing.
Claim 10
Dependent Claim
30 words
The process as defined in claim 8 in which step (2) is performed to provide a pressure of about 1,000 to about 30,000 psi during the hot isostatically pressing step.
Claim 11
Dependent Claim
35 words
The process as defined in claim 1 in which step (2) is performed by hot extrusion of the annular cylindrical container over a mandrel at an extrusion ratio of about 3:1 up to about 10:1.
Claim 12
Dependent Claim
25 words
The process as defined in claim 1 in which step (6) is performed to provide an extrusion ratio of about 3:1 up to about 10:1.
Claim 13
Dependent Claim
26 words
The process as defined in claim 4 in which steps (2), (5), and (6) are performed at a temperature of about 1,850° to about 2,250° F.
Claim 14
Dependent Claim
14 words
A composite billet produced in accordance with the process as defined in claim 1.
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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) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |