US4238433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making molten silicon infiltration reaction products
Assignee: General Electric Co
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Filing: 1978-12-15
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Granted: 1980-12-09
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Expires: 1998-12-15
Abstract
Abstract Infiltration reaction products are provided of molten silicon and certain blends of particulated carbon and various particulated inorganic materials substantially unreactive to molten silicon, such as boron nitride particles. These molten silicon infiltration products of reaction are readily machinable and can be applied, or formed in-situ as contiguous layers on silicon carbide, or silicon-silicon carbide substrates, etc., to produce multilayer composites having an improved impact strength over the base refractory structure.
Inventors
- 👤 William B. Hillig
- 👤 Charles R. Morelock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:33
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/573; C04B35/71; C04B35/78; C04B35/80
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
A method for making a silicon carbide composite comprising a refractory base structure and a contiguous machinable or compliant layer structure, which comprises, (1) introducing molten silicon into a mold substantially filled with a composite having a base structure, and a contiguous exterior layer, where the base structure is a member selected from (i) a shaped mass of silicon carbide, (ii) a composite of silicon and silicon carbide, and (iii) a carbon fiber preform and the contiguous exterior layer comprises a uniform mixture of particulated carbon and a particulated inorganic material substantially non-reactive to molten silicon and having a Mohs hardness in the range of from about 1 to about 7, (2) allowing the molten silicon to fully infiltrate into said mold, while allowing gases of reaction to vent therefrom and (3) removing the resulting silicon carbide composite from the mold.
Claim 2
Independent Claim
141 words
A method for making a silicon carbide composite comprising a refractory base structure and a contiguous machinable or compliant layer structure, which comprises, (1) introducing molten silicon into a mold substantially filled with a composite having a base structure, and a contiguous exterior layer, where the base structure is a member selected from (i) a shaped mass of silicon carbide, (ii) a composite of silicon and silicon carbide, and (iii) a carbon fiber preform and the contiguous exterior layer comprises a uniform mixture of particulated carbon and a particulated inorganic material substantially non-reactive to molten silicon and having a Mohs hardness in the range of from about 1 to about 7, (2) allowing the molten silicon to fully infiltrate into said mold, while allowing gases of reaction to vent therefrom and (3) removing the resulting silicon carbide composite from the mold.
Claim 3
Dependent Claim
25 words
A method in accordance with claim 1, where the molten silicon is infiltrated into a mold containing a base structure of a carbon fiber preform.
Claim 4
Dependent Claim
26 words
A method for making a composite in accordance with claim 1, where the contiguous layer consists of a mixture of particulated carbon and particulated boron nitride.
References Cited (Backward Citations)
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US3859399A
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US4141948A
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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) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |