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US4240835A
Expired / Lapsed
US
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Method of making a shaped silicon carbide-silicon matrix composite and articles made thereby
Assignee: General Electric Co
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Filing: 1979-12-05
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Granted: 1980-12-23
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Expires: 1999-12-05
Abstract
Abstract A method is described for making a shaped silicon carbide-silicon matrix composite. A confined carbon fiber preform is infiltrated with sufficient molten silicon metal at a temperature in the range of from about 1400° C. to about 1800° C. in an inert atmosphere or vacuum. Silicon carbide powder can also be incorporated in the preform structure.
Inventors
- 👤 William Laskow
- 👤 Charles R. Morelock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:25
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/573; C04B35/71; C04B35/78; C04B35/80; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
88 words
A shaped ceramic consisting essentially of axially aligned silicon carbide crystals in a silicon metal matrix having from about 4% by weight to about 30% by weight of carbon in a chemically combined form or as a mixture of chemically combined carbon and elemental carbon, said shaped ceramic exhibiting a density of about 2.3 to 3.0 grams/cc, a permanent elastic strain when measured at about 1000° C. of from about 0% to about 6%, and an elastic modulus of from about 30×10 6 psi to 60×10 6 psi.
Claim 2
Dependent Claim
88 words
A shaped ceramic consisting essentially of axially aligned silicon carbide crystals in a silicon metal matrix having from about 4% by weight to about 30% by weight of carbon in a chemically combined form or as a mixture of chemically combined carbon and elemental carbon, said shaped ceramic exhibiting a density of about 2.3 to 3.0 grams/cc, a permanent elastic strain when measured at about 1000° C. of from about 0% to about 6%, and an elastic modulus of from about 30×10 6 psi to 60×10 6 psi.
Claim 3
Dependent Claim
19 words
A shaped ceramic as in claim 1 where the axially aligned silicon carbide crystals have a general parallel relationship.
Claim 4
Dependent Claim
20 words
A shaped ceramic as in claim 1 which further includes other silicon carbide crystals dispersed in the silicon metal matrix.
Claim 5
Dependent Claim
34 words
A shaped ceramic as in claim 3 where the amount of silicon carbide crystals dispersed in the silicon metal matrix is up to about 25% or greater of the weight of said shaped ceramic.
Claim 6
Dependent Claim
16 words
A shaped ceramic as in claim 1 in the form of a gas turbine engine part.
Claim 7
Dependent Claim
14 words
A shaped ceramic as in claim 1 in the form of an automotive part.
Claim 8
Dependent Claim
15 words
A shaped ceramic as in claim 1 in the form of an automotive engine part.
Claim 9
Dependent Claim
14 words
A shaped ceramic as in claim 1 in the form of a chemical container.
Claim 10
Dependent Claim
71 words
A shaped silicon carbide silicon matrix composite ceramic having a density of about 2.3 to 3 grams/cc, about 8% to 80% by volume of aligned silicon carbide crystals based on total ceramic volume, a permanent elastic strain when measured above 1,000° C. of from 0% to about 6%, an elastic modulus of from about 30×10 6 psi to 60×10 6 psi and a tensile strength of 30 KSI to 99 KSI.
Claim 11
Dependent Claim
71 words
A shaped silicon carbide silicon matrix composite ceramic having a density of about 2.3 to 3 grams/cc, about 8% to 80% by volume of aligned silicon carbide crystals based on total ceramic volume, a permanent elastic strain when measured above 1,000° C. of from 0% to about 6%, an elastic modulus of from about 30×10 6 psi to 60×10 6 psi and a tensile strength of 30 KSI to 99 KSI.
Claim 12
Dependent Claim
17 words
A shaped ceramic in accordance with claim 9 in the form of a gas turbine shroud section.
Claim 13
Dependent Claim
17 words
A shaped ceramic in accordance with claim 9 in the form of an aircraft engine shroud section.
Claim 14
Dependent Claim
17 words
A shaped ceramic in accordance with claim 9 in the form of a gas turbine transition piece.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |