US4446169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making silicon carbide coatings
Assignee: Westinghouse Electric Corp
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Filing: 1982-09-16
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Granted: 1984-05-01
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Expires: 2002-09-16
Abstract
Abstract A method is disclosed for preparing a silicon carbide-coated substrate without subjecting the substrate to unnecessary thermal stress. A coating of a silicon carbide precursor polymer is placed on a substrate and the coating is subjected to a laser beam of sufficient energy to raise the temperature of the coating in the area of impingement of the laser beam to approximately 1200° C. to 1600° C. until the coating is converted into a silicon carbide ceramic material. The area of laser beam impingement is located in an inert atmosphere or vacuum while the reaction is taking place.
Inventors
- 👤 Peter M. Castle
- 👤 George G. Sweeney
- 👤 Lymperios N. Yannopoulos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:00
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/22; C23; C23C; C23C18/00; C23C18/14; C23C18/143; C03C2217/00; C03C2217/20; C03C2217/28; C03C2217/282; C03C2218/00; C03C2218/30; C03C2218/32
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
85 words
A method of preparing a silicon carbide-coated article comprising the steps of: placing a coating of a silicon carbide precursor polymer on a substrate; and directing onto said coating a laser beam with energy sufficient to raise the temperature of said coating in the area of impingement of the laser beam to approximately 1200° C., to 1600° C., until said coating is converted into a silicon carbide ceramic material, wherein said coating in the area of impingement is located in an inert atmosphere or vacuum.
Claim 2
Independent Claim
85 words
A method of preparing a silicon carbide-coated article comprising the steps of: placing a coating of a silicon carbide precursor polymer on a substrate; and directing onto said coating a laser beam with energy sufficient to raise the temperature of said coating in the area of impingement of the laser beam to approximately 1200° C., to 1600° C., until said coating is converted into a silicon carbide ceramic material, wherein said coating in the area of impingement is located in an inert atmosphere or vacuum.
Claim 3
Dependent Claim
59 words
A method of preparing a silicon carbide-coated article as recited in claim 1, further comprising the step of: moving said coating and said laser beam relative to one another at a rate sufficient to cause each increment of said coating exposed within the area of impingement to be heated to a temperature of approximately 1200° C. to 1600° C.
Claim 4
Dependent Claim
35 words
A method of preparing a silicon carbide-coated article as recited in claim 1, wherein said silicon carbide is in the form of a layer which ranges in thickness from about 1000 Angstroms to 1.0 micron.
Claim 5
Dependent Claim
28 words
A method of preparing a silicon carbide-coated article as recited in claim 1, wherein said laser beam has an energy density of about 10±5 watts per square millimeter.
Claim 6
Dependent Claim
22 words
A method of preparing a silicon carbide-coated article as recited in claim 1, wherein said silicon carbide precursor polymer is an organopolysilane.
Claim 7
Dependent Claim
18 words
A method of preparing a silicon carbide-coated article as recited in claim 5, wherein said organopolysilane is polysilastyrene.
Claim 8
Dependent Claim
24 words
A method of preparing a silicon carbide-coated article as recited in claim 1, wherein said laser beam is generated by a carbon dioxide laser.
Claim 9
Dependent Claim
28 words
A method of preparing a silicon carbide-coated article as recited in claim 1, wherein said coating is irradiated by said laser beam for about one to three seconds.
Claim 10
Dependent Claim
18 words
A method of preparing a silicon carbide-coated article as recited in claim 1, wherein said substrate is quartz.
Claim 11
Independent Claim
111 words
A method of preparing a silicon carbide-coated article comprising the steps of: (a) placing a coating of a silicon carbide precursor polymer on a substrate; (b) directing onto said coating a laser beam with energy sufficient to raise the temperature of a portion of said coating in the area of impingement of the laser beam to approximately 1200° C. to 1600° C., until said portion of said coating is converted into a silicon carbide ceramic material, wherein said coating in the area of impingement is located in an inert atmosphere or vacuum; and (c) repeating step (b) to convert an additional portion of said coating into a silicon carbide ceramic material.
Claim 12
Independent Claim
111 words
A method of preparing a silicon carbide-coated article comprising the steps of: (a) placing a coating of a silicon carbide precursor polymer on a substrate; (b) directing onto said coating a laser beam with energy sufficient to raise the temperature of a portion of said coating in the area of impingement of the laser beam to approximately 1200° C. to 1600° C., until said portion of said coating is converted into a silicon carbide ceramic material, wherein said coating in the area of impingement is located in an inert atmosphere or vacuum; and (c) repeating step (b) to convert an additional portion of said coating into a silicon carbide ceramic material.
Claim 13
Dependent Claim
62 words
A method of preparing a silicon carbide-coated article as recited in claim 10, further comprising the steps of: moving said coating and said laser beam relative to one another at a rate sufficient to cause a portion of each increment of said coating exposed within the area of impingement to be heated to a temperature of approximately 1200° C. to 1600° C.
Claim 14
Dependent Claim
35 words
A method of preparing a silicon carbide-coated article as recited in claim 10, wherein said silicon carbide is in the form of a layer which ranges in thickness from about 1000 Angstroms to 1.0 micron.
Claim 15
Dependent Claim
28 words
A method of preparing a silicon carbide-coated article as recited in claim 10, wherein said laser beam has an energy density of about 10±5 watts per square millimeter.
Claim 16
Dependent Claim
22 words
A method of preparing a silicon carbide-coated article as recited in claim 10, wherein said silicon carbide precurser polymer is an organopolysilane.
Claim 17
Dependent Claim
18 words
A method of preparing a silicon carbide-coated article as recited in claim 14, wherein said organopolysilane is polysilastyrene.
Claim 18
Dependent Claim
24 words
A method of preparing a silicon carbide-coated article as recited in claim 10, wherein said laser beam is generated by a carbon dioxide laser.
Claim 19
Dependent Claim
24 words
A method of preparing a silicon carbide-coated article as recited in claim 10, wherein said laser beam is generated by an argon ion laser.
Claim 20
Dependent Claim
18 words
A method of preparing a silicon carbide-coated article as recited in claim 10, wherein said substrate is quartz.
References Cited (Backward Citations)
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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) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |