US4383854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of creating a controlled interior surface configuration of passages within a substrate
Assignee: United States, AS REPRESENTED BY DOE
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Filing: 1980-12-29
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Granted: 1983-05-17
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Expires: 2000-12-29
Abstract
Abstract A method of creating a controlled interior surface configuration of passages within a substrate, particularly cooling passages of nozzles or buckets of a gas turbine, involves the hot isostatic pressing of a leachable passage insert whose surface carries the female image of the desired interior surface configuration inside the substrate followed by leaching of the insert from the substrate.
Inventors
- 👤 Peter V. Dembowski
- 👤 Peter W. Schilke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:18
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/187; B; B22; B22F; B22F5/00; B22F5/04; B22F5/10; F01D5/28; F01D5/284; B22F2005/103; B22F2998/00; B22F2998/10; B23; B23P; B23P2700/00; B23P2700/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
60 words
A method of creating a controlled surface configuration of passages within a substrate which comprises assembling said substrate and a leachable passage insert whose surface carries a female image of a desired passage surface configuration, hot isostatic pressing said substrate against said insert, and leaching said insert from said substrate to create the desired passage surface configuration in said substrate.
Claim 2
Independent Claim
60 words
A method of creating a controlled surface configuration of passages within a substrate which comprises assembling said substrate and a leachable passage insert whose surface carries a female image of a desired passage surface configuration, hot isostatic pressing said substrate against said insert, and leaching said insert from said substrate to create the desired passage surface configuration in said substrate.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein said passage insert is inserted in said passage.
Claim 4
Dependent Claim
22 words
The method of claim 2 wherein a seam formed between the insert and the substrate is sealed prior to hot isostatic pressing.
Claim 5
Dependent Claim
13 words
The method of claim 3 wherein said insert is a mild steel rod.
Claim 6
Dependent Claim
15 words
The method of claim 4 wherein said mild steel rod is leached by nitric acid.
Claim 7
Dependent Claim
19 words
The method of claim 5 wherein glass is used as a pressure transmitting medium during said hot isostatic pressing.
Claim 8
Dependent Claim
28 words
The method of claim 1 or 4 including the step of forming a negative image of the desired passage surface configuration on the exterior surface of said insert.
Claim 9
Dependent Claim
26 words
The method of claim 7 wherein said negative image is the negative of a surface configuration adapted to cause turbulence of fluid flowing within said passage.
Claim 10
Dependent Claim
18 words
The method of claim 1 wherein a plurality of said inserts are so assembled, pressed and leached simultaneously.
Claim 11
Dependent Claim
29 words
The method of claim 1 wherein said substrate comprises a powder which is consolidated at the same time as the hot isostatic pressing of said substrate against said insert.
Claim 12
Dependent Claim
29 words
The method of claim 1 wherein said insert carries non-leachable elements adapted to be bonded to said substrate within said passages as a consequence of said hot isostatic pressing.
References Cited (Backward Citations)
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US2843354A
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US4119390A
Cited
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Cited
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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) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |