US4574451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing an article with a fluid passage
Assignee: General Electric Co
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Filing: 1982-12-22
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Granted: 1986-03-11
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Expires: 2002-12-22
Abstract
Abstract A fluid-cooled article, such as a turbomachinery blading member, is provided with a fluid passage by a method of depositing a first material on a work surface of a mandrel by low pressure plasma deposition. A first member thus generated is separated from the mandrel. In one form, an inner surface of the first member is provided with a surface groove. After depositing a sacrificial material in the groove, a cover material is applied to entrap the sacrificial material. Removal of the sacrificial material provides the fluid passage.
Inventors
- 👤 Russell W. Smashey
- 👤 Lewis J. Stoffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:35
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/04; F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/187; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981; Y10T29/4998; Y10T29/49988
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
137 words
In a method for producing an article which includes a fluid passage, the steps of: (a) providing a mandrel including a work surface; (b) deposition a first material on the work surface by low pressure plasma deposition to provide a first member having an inner surface in contact with the work surface; (c) separating the first member and the mandrel; (d) generating in the inner surface of the first member a groove of a selected configuration of at least a portion of the fluid passage; (e) depositing a sacrificial material in the groove; (f) applying a cover material over the sacrificial material and over at least that portion of the inner surface adjacent the sacrificial material to provide a preform; and then (g) removing the sacrificial material to provide at least a portion of the fluid passage.
Claim 2
Dependent Claim
137 words
In a method for producing an article which includes a fluid passage, the steps of: (a) providing a mandrel including a work surface; (b) deposition a first material on the work surface by low pressure plasma deposition to provide a first member having an inner surface in contact with the work surface; (c) separating the first member and the mandrel; (d) generating in the inner surface of the first member a groove of a selected configuration of at least a portion of the fluid passage; (e) depositing a sacrificial material in the groove; (f) applying a cover material over the sacrificial material and over at least that portion of the inner surface adjacent the sacrificial material to provide a preform; and then (g) removing the sacrificial material to provide at least a portion of the fluid passage.
Claim 3
Dependent Claim
17 words
The method of claim 1 in which the groove is generated in the inner surface by photoetching.
Claim 4
Dependent Claim
23 words
The method of claim 1 in which a chemical material removal solution is circulated through the fluid passage to refine the fluid passage.
Claim 5
Dependent Claim
25 words
The method of claim 1 in which, after removal of the sacrificial material, the article is thermomechanically processed to produce a more desirable grain configuration.
Claim 6
Dependent Claim
29 words
The method of claim 1 in which, after applying the cover material and before removing the sacrificial material, the preform is shaped to approach the shape of the article.
Claim 7
Dependent Claim
28 words
The method of claim 5 in which the step of shaping the preform includes subjecting the preform to hot isostatic pressing to densify metallurgical structure of the article.
Claim 8
Dependent Claim
130 words
In a method for producing an article which includes a fluid passage, the steps of: (a) providing a mandrel including a work surface; (b) depositing a first material on the work surface by low pressure plasma deposition to provide a first member having an inner surface in contact with the work surface; (c) separating the first member and the mandrel; (d) depositing on the inner surface of the first member a sacrificial material in a selected configuration of at least a portion of the fluid passage; (e) applying a cover material over the sacrificial material and over at least that portion of the inner surface adjacent the sacrificial material to provide a preform; and then (f) removing the sacrificial material to provide at least a portion of the fluid passage.
Claim 9
Dependent Claim
130 words
In a method for producing an article which includes a fluid passage, the steps of: (a) providing a mandrel including a work surface; (b) depositing a first material on the work surface by low pressure plasma deposition to provide a first member having an inner surface in contact with the work surface; (c) separating the first member and the mandrel; (d) depositing on the inner surface of the first member a sacrificial material in a selected configuration of at least a portion of the fluid passage; (e) applying a cover material over the sacrificial material and over at least that portion of the inner surface adjacent the sacrificial material to provide a preform; and then (f) removing the sacrificial material to provide at least a portion of the fluid passage.
Claim 10
Dependent Claim
23 words
The method of claim 7 in which a chemical material removal solution is circulated through the fluid passage to refine the fluid passage.
Claim 11
Dependent Claim
25 words
The method of claim 7 in which, after removal of the sacrificial material, the article is thermomechanically processed to produce a more desirable grain configuration.
Claim 12
Dependent Claim
29 words
The method of claim 7 in which, after applying the cover material and before removing the sacrificial material, the preform is shaped to approach the shape of the article.
Claim 13
Dependent Claim
28 words
The method of claim 10 in which the steps of shaping the preform includes subjecting the preform to hot isostatic pressing to densify metallurgical structure of the article.
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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) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |