US4536449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction bonded silicon carbide artefacts
Assignee: Tenmat Ltd
•
Filing: 1984-08-27
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Granted: 1985-08-20
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Expires: 2004-08-27
Abstract
Abstract A silicon carbide-silicon matrix composite incorporates unreacted coarse carbon particles (e.g. graphite particles) dispersed throughout the composite. The coarse particles are incorporated in a coherent mixture of carbon and silicon carbide powders which, after compaction, is infiltrated with molten silicon to form a matrix of reaction bonded silicon carbide in a substantially continuous free silicon carbide phase. By using coarse carbon particles of density of at least 0.963 g/ml, the molten silicon reacts only with the surfaces of those particles which may as a result remain unreacted and dispersed throughout the composite.
Inventors
- 👤 Peter Kennedy
- 👤 Kenneth Parkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:49
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/573; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12486; Y10T428/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
14 words
A silicon carbide-silicon matrix composite incorporating unreacted coarse carbon particles dispersed throughout the composite.
Claim 2
Dependent Claim
14 words
A silicon carbide-silicon matrix composite incorporating unreacted coarse carbon particles dispersed throughout the composite.
Claim 3
Independent Claim
47 words
A method of producing a reaction-bonded silicon carbide artefact comprising incorporating coarse carbon particles of density of at least 0.963 g/ml in a coherent mixture of carbon and silicon carbide powders and siliconising the mixture to produce a reaction-bonded silicon carbide artefact having carbon particles dispersed therein.
Claim 4
Independent Claim
47 words
A method of producing a reaction-bonded silicon carbide artefact comprising incorporating coarse carbon particles of density of at least 0.963 g/ml in a coherent mixture of carbon and silicon carbide powders and siliconising the mixture to produce a reaction-bonded silicon carbide artefact having carbon particles dispersed therein.
Claim 5
Dependent Claim
20 words
A method as claimed in claim 2 in which said coarse carbon particles are at least 40 microns in size.
Claim 6
Dependent Claim
20 words
A method as claimed in claim 3 in which said coarse carbon particles are at least 75 microns in size.
Claim 7
Dependent Claim
23 words
A method as claimed in claim 4 in which said coarse carbon particles are within a size range of 75 to 300 microns.
Claim 8
Dependent Claim
21 words
A method as claimed in claim 2 in which the carbon powder of said coherent mixture has a sub-micron particle size.
Claim 9
Dependent Claim
15 words
A composite according to claim 1 in which said coarse carbon particles comprise graphite particles.
Claim 10
Dependent Claim
15 words
A method according to claim 2 in which said coarse carbon particles comprise graphite particles.
Claim 11
Dependent Claim
14 words
An artefact made by the method of any one of claims 2-5 or 8.
References Cited (Backward Citations)
US3966855A
Cited
US4148894A
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US4299881A
Cited
US4282288A
Cited
GB2064499A
Cited
US4482512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |