Patent US4302482A successfully refreshed from Google Patents.
US4302482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for applying metallic sprayed coats to the inner surface of a hollow body
Assignee: Audi AG
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Filing: 1980-04-14
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Granted: 1981-11-24
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Expires: 2000-04-14
Abstract
Abstract A process for applying a metallic sprayed coat to the inner surface of a metal hollow body includes heating the body to a temperature of over 150° C. before coating and cooling the body through at least 50° C. during the coating process. Positive shrinkage tensions are thereby created during the coating which act to improve adhesion in operation.
Inventors
- 👤 Klaus Heck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:41
CPC Classifications
C; C23; C23C; C23C4/00; C23C4/01
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
In a process for applying a metallic sprayed coat by means of a thermal spraying process to the inner surface of a hollow body which is composed of a metal having a heat expansion coefficient which is larger than that of the coating metal, the improvement in which the hollow body is heated to a temperature of over 150° C. before coating and is cooled by at least 50° C. during coating whereby adhesion of the coat to the inner surface of the hollow body is improved as a result of positive shrinkage tension created during the coating operation which tension continues to exist during subsequent thermal loading caused by operation of the hollow body.
Claim 2
Dependent Claim
115 words
In a process for applying a metallic sprayed coat by means of a thermal spraying process to the inner surface of a hollow body which is composed of a metal having a heat expansion coefficient which is larger than that of the coating metal, the improvement in which the hollow body is heated to a temperature of over 150° C. before coating and is cooled by at least 50° C. during coating whereby adhesion of the coat to the inner surface of the hollow body is improved as a result of positive shrinkage tension created during the coating operation which tension continues to exist during subsequent thermal loading caused by operation of the hollow body.
Claim 3
Dependent Claim
30 words
A process as claimed in claim 1, in which removal of heat from the hollow body is progressively increased in accordance with the increase in the thickness of the coat.
Claim 4
Dependent Claim
30 words
A process as claimed in claim 1, in which cooling is carried out by evaporating a fluid cooling medium on the outer surface of the wall of the hollow body.
Claim 5
Dependent Claim
15 words
A process as claimed in claim 3 in which the fluid cooling medium is water.
Claim 6
Dependent Claim
184 words
In a process for applying a metallic sprayed coat by means of a thermal spraying process to the inner surface of a hollow body, which is composed of a metal having a heat expansion coefficient which is larger than that of the coating metal, the improvement in which the hollow body is heated to a temperature of over 150° C. before coating and is cooled by at least 50° C. during coating, with said cooling being carried out by evaporating a fluid coating medium on the outer surface of the hollow body and the removal of heat from said body being progressively increased relative to the increase in the thickness of the coat being applied whereby adhesion of the coat to the inner surface of the hollow body is improved as a result of positive shrinkage tension created during the coating operation which tension continues to exist during subsequent thermal loading caused by operation of the hollow body and which positive pressure shrinkage tensions during coating increases as the coat thickness increases causing the hollow body to embrace the sprayed coat with increasing force.
Claim 7
Dependent Claim
184 words
In a process for applying a metallic sprayed coat by means of a thermal spraying process to the inner surface of a hollow body, which is composed of a metal having a heat expansion coefficient which is larger than that of the coating metal, the improvement in which the hollow body is heated to a temperature of over 150° C. before coating and is cooled by at least 50° C. during coating, with said cooling being carried out by evaporating a fluid coating medium on the outer surface of the hollow body and the removal of heat from said body being progressively increased relative to the increase in the thickness of the coat being applied whereby adhesion of the coat to the inner surface of the hollow body is improved as a result of positive shrinkage tension created during the coating operation which tension continues to exist during subsequent thermal loading caused by operation of the hollow body and which positive pressure shrinkage tensions during coating increases as the coat thickness increases causing the hollow body to embrace the sprayed coat with increasing force.
References Cited (Backward Citations)
US2588422A
Cited
US3839618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-23 | 1985-05-25 | 1985-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-23 | 1989-05-25 | 1989-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-23 | 1993-05-25 | 1993-11-24 | $7700.00 | Window Closed / Lapsed |