US4482512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Making silicon carbide bodies
Assignee: Morganite Special Carbons Ltd
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Filing: 1982-05-25
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Granted: 1984-11-13
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Expires: 2002-05-25
Abstract
Abstract Reaction-bonded SiC is made by steps which include preparing a porous preform of particulate SiC and a carbon yielding binder, heating the preform in to convert the binder to carbon, and while the preform in a vacuum or inert atmosphere is in contact with a compacted silicon cake made from particulate silicon and a carbon yielding binder, to cause melting and migration into the preform of silicon from the silicon cake, wherein the silicon cake is made essentially of silicon metal in flake form and the binder, and the binder when mixed with the silicon is in such liquid state that it forms a coating on the surfaces of substantially all the silicon flakes.
Inventors
- 👤 John E. Alsop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:22
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/573
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
157 words
A method of making a reaction-bonded silicon carbide body by steps which include preparing a porous preform comprising compacted particulate silicon carbide and a carbon-yielding binder, heating the preform to convert the binder to carbon and, while the preform in a vacuum or inert atmosphere is in contact with a source of silicon in the form of a compacted silicon cake, made from ingredients including particulate silicon and a carbon-yielding binder, to cause melting and migration into the preform of silicon from the silicon cake, characterised thereby that the silicon cake is made essentially only of silicon metal in flake form and the binder, the amount of binder used in making the silicon cake being at least 10% by weight of the silicon, and the binder, when mixed with the silicon, is in such liquid state that it wets the silicon substantially throughout and provides a coating of binder on surfaces of substantially all the silicon flakes.
Claim 2
Independent Claim
157 words
A method of making a reaction-bonded silicon carbide body by steps which include preparing a porous preform comprising compacted particulate silicon carbide and a carbon-yielding binder, heating the preform to convert the binder to carbon and, while the preform in a vacuum or inert atmosphere is in contact with a source of silicon in the form of a compacted silicon cake, made from ingredients including particulate silicon and a carbon-yielding binder, to cause melting and migration into the preform of silicon from the silicon cake, characterised thereby that the silicon cake is made essentially only of silicon metal in flake form and the binder, the amount of binder used in making the silicon cake being at least 10% by weight of the silicon, and the binder, when mixed with the silicon, is in such liquid state that it wets the silicon substantially throughout and provides a coating of binder on surfaces of substantially all the silicon flakes.
Claim 3
Dependent Claim
19 words
A method according to claim 1, characterised thereby that the binder used in the silicon cake is water soluble.
Claim 4
Dependent Claim
15 words
A method according to claim 2, characterised thereby that the binder is sodium lignone sulphonate.
Claim 5
Dependent Claim
34 words
A method according to claim 3, in which the silicon content of the silicon cake is about twice the theoretical amount required for conversion to silicon carbide of the carbon content of the preform.
Claim 6
Dependent Claim
34 words
A method according to claim 2, in which the silicon content of the silicon cake is about twice the theoretical amount required for conversion to silicon carbide of the carbon content of the preform.
Claim 7
Dependent Claim
34 words
A method according to claim 1, in which the silicon content of the silicon cake is about twice the theoretical amount required for conversion to silicon carbide of the carbon content of the preform.
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) | 1987-11-13 | 1988-05-14 | 1988-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-13 | 1992-05-14 | 1992-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-13 | 1996-05-14 | 1996-11-13 | $7700.00 | Window Closed / Lapsed |