Patent US4499048A successfully refreshed from Google Patents.
US4499048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of consolidating a metallic body
Assignee: POWMET FORGINGS LLC
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Filing: 1983-02-23
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Granted: 1985-02-12
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Expires: 2003-02-23
Abstract
Abstract A method of consolidating a metallic body is disclosed. The method comprises the steps of forming an article of manufacture from powdered metal; sintering the article of manufacture so as to increase the strength thereof; coating the article with a sacrificial layer of ceramic; providing a bed of heated, generally spheroidal ceramic particles; compacting the coated article of manufacture embedded in the heated bed under pressure to thereby consolidate the article into a dense, desired shape; and, removing said sacrificial coating such that the surface of the article remains substantially free of process-related imperfections.
Inventors
- 👤 Francis G. Hanejko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:43
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/12; B22F3/14; B22F3/15; B22F3/156; B22F2998/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
108 words
A method of consolidating a metallic body comprising the steps of: (a) forming an article of manufacture from powdered metal; (b) sintering said article of manufacture so as to increase the strength thereof; (c) coating said article of manufacture with a sacrificial cermic coating; (d) providing a bed of heated, generally spheroidal ceramic particles; (e) compacting said coated article of manufacture in said heated bed of generally spheroidal ceramic particles under high pressure to thereby consolidate said coated article of manufacture into a dense, desired shape; and (f) removing said sacrificial ceramic coating such that the surface of said article of manufacture remains substantially free of process-related inperfections.
Claim 2
Independent Claim
108 words
A method of consolidating a metallic body comprising the steps of: (a) forming an article of manufacture from powdered metal; (b) sintering said article of manufacture so as to increase the strength thereof; (c) coating said article of manufacture with a sacrificial cermic coating; (d) providing a bed of heated, generally spheroidal ceramic particles; (e) compacting said coated article of manufacture in said heated bed of generally spheroidal ceramic particles under high pressure to thereby consolidate said coated article of manufacture into a dense, desired shape; and (f) removing said sacrificial ceramic coating such that the surface of said article of manufacture remains substantially free of process-related inperfections.
Claim 3
Dependent Claim
19 words
A method of consolidating a metallic body according to claim 1 wherein said generally spheroidal ceramic particles are alumina.
Claim 4
Independent Claim
26 words
A method of consolidating a metallic body according to claims 1 or 2 where said alumina particles are coated with a thermally stable, generally non-reactive lubricant.
Claim 5
Dependent Claim
16 words
A method of consolidating a metallic body according to claim 3 wherein said lubricant is graphite.
Claim 6
Dependent Claim
30 words
A method of consolidating a metallic body according to claim 1 wherein said sacrificial ceramic coating is selected from the group consisting of alumina, silica, chrome oxide and zirconium oxide.
Claim 7
Independent Claim
130 words
A method of consolidating a metallic body comprising the steps of: (a) forming an article of manufacture from powdered metal; (b) sintering said article of manufacture so as to increase the strength thereof; (c) coating said article of manufacture with a sacrificial ceramic coating; (d) providing a bed of heated, generally spheroidal ceramic particles which have been coated with a thermally stable, generally non-reactive lubricant; (e) heating said coated article of manufacture to a predetermined temperature; (f) compacting said coating article of manufacture in said heated bed of generally spheroidal coated ceramic particles under high pressure to thereby consolidate said article of manufacture into a dense, desired shape; and (g) removing said sacrificial ceramic coating such that the surface of said article of manufacture remains substantially free of process-related inperfections.
Claim 8
Independent Claim
130 words
A method of consolidating a metallic body comprising the steps of: (a) forming an article of manufacture from powdered metal; (b) sintering said article of manufacture so as to increase the strength thereof; (c) coating said article of manufacture with a sacrificial ceramic coating; (d) providing a bed of heated, generally spheroidal ceramic particles which have been coated with a thermally stable, generally non-reactive lubricant; (e) heating said coated article of manufacture to a predetermined temperature; (f) compacting said coating article of manufacture in said heated bed of generally spheroidal coated ceramic particles under high pressure to thereby consolidate said article of manufacture into a dense, desired shape; and (g) removing said sacrificial ceramic coating such that the surface of said article of manufacture remains substantially free of process-related inperfections.
Claim 9
Dependent Claim
19 words
A method of consolidating a metallic body according to claim 6 where said generally spheroidal ceramic particles are alumina.
Claim 10
Dependent Claim
30 words
A method of consolidating a metallic body according to claim 6 wherein said sacrificial ceramic coating is selected from the group consisting of alumina, silica, chrome oxide and zirconium oxide.
Claim 11
Dependent Claim
29 words
A method of consolidating a metallic body according to claim 7 where said generally spheroidal alumina particles have a size in the range of about 100 to 140 mesh.
Claim 12
Dependent Claim
16 words
A method of consolidating a metallic body according to claim 8 wherein said lubricant is graphite.
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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) | 1988-02-12 | 1988-08-13 | 1989-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-12 | 1992-08-13 | 1993-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-12 | 1996-08-13 | 1997-02-12 | $7700.00 | Window Closed / Lapsed |