US4618591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicon carbide-carbon composite molded product and process for manufacturing the same
Assignee: Research Institute for Special Inorganic Materials
•
Filing: 1985-06-03
•
Granted: 1986-10-21
•
Expires: 2005-06-03
Abstract
Abstract A molded product consisting mainly of silicon carbide and a process for manufacturing the same. This invention is to provide a product having a desired or complicated shape and a process which enables the manufacture of any such product at a drastically lower temperature than any conventional process. This object is attained by applying an organic silicon polymer having a skeleton composed mainly of carbon-silicon bonds by impregnation or adherence to a base material having a desired shape, and by burning the base material at a temperature of 700 DEG C. to 2,000 DEG C. in a vacuum or in a nonoxidizing gas atmosphere. The product of this invention has a fibrous, granular and/or filmy carbon structure in the matrix consisting mainly of SiC. The product of this invention is useful for a wide variety of applications, for example, for making heat-resistant structural members of electronic devices.
Inventors
- 👤 Kiyohito Okamura
- 👤 Yoshio Hasegawa
- 👤 Yoshiyasu Kuroo
- 👤 Masana Ugaji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:17
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/571; C04B35/71; C04B35/78; C04B35/80; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
130 words
A silicon carbide-carbon composite consisting of a matrix consisting essentially of SiC and having bonded therein an amorphous carbon, said composite having been produced by: providing a molded base material composed of an organic polymer which is thermally decomposable to a fibrous carbon by high temperature treatment, said base material being shaped into a desired configuration, impregnating said base material with an organic silicon polymer having a molecular skeleton consisting mainly of carbon-silicon bonds, burning the thus impregnated product at a temperature of at least 700° C. in the absence of oxygen to simultaneously (a) convert said organic silicon polymer to a matrix consisting mainly of SiC, (b) convert said base material mainly to fibrous carbon and (c) bond the two together by simultaneous shrinkage without separation during such burning.
Claim 2
Dependent Claim
130 words
A silicon carbide-carbon composite consisting of a matrix consisting essentially of SiC and having bonded therein an amorphous carbon, said composite having been produced by: providing a molded base material composed of an organic polymer which is thermally decomposable to a fibrous carbon by high temperature treatment, said base material being shaped into a desired configuration, impregnating said base material with an organic silicon polymer having a molecular skeleton consisting mainly of carbon-silicon bonds, burning the thus impregnated product at a temperature of at least 700° C. in the absence of oxygen to simultaneously (a) convert said organic silicon polymer to a matrix consisting mainly of SiC, (b) convert said base material mainly to fibrous carbon and (c) bond the two together by simultaneous shrinkage without separation during such burning.
Claim 3
Dependent Claim
20 words
A composite according to claim 1 wherein said burning takes place at a temperature of 700° C. to 2000° C.
Claim 4
Dependent Claim
20 words
A composite according to claim 1 wherein said burning takes place at a temperature of 800° C. to 1800° C.
Claim 5
Dependent Claim
20 words
A composite according to claim 1 wherein said organic polymer has an average molecular weight of from 100 to 1,000,000.
Claim 6
Dependent Claim
20 words
A composite according to claim 1 wherein said organic polymer has an average molecular weight of from 500 to 20,000.
Claim 7
Dependent Claim
19 words
A composite according to claim 1 wherein said base material is insolubilized before impregnation to produce a cross-linked structure.
Claim 8
Dependent Claim
36 words
A composite according to claim 1 wherein said matrix contains from 40 to 65% by weight silicon, 25 to 45% by weight carbon, 0.1 to 30% by weight oxygen and 0.01 to 2% by weight hydrogen.
Claim 9
Dependent Claim
25 words
A composite according to claim 1 wherein said organic silicon polymer is a polysilmethylene, a polysilphenylene, a poly (silpolymethylene), a carbosiloxane polymer, or mixtures thereof.
Claim 10
Dependent Claim
77 words
A composite according to claim 1 wherein said base material is a cellulose polymer, a protein polymer, an isoprene polymer, a pitch polymer, a lignin poval polymer, a polyvinyl alcohol polymer, a polyvinyl chloride polymer, a polyvinylidene chloride polymer, a polyacrylonitrile polymer, a furfuryl alcohol polymer, a polyester, a polyolefin, a polystyrene, a phenol polymer, a polyamide, a polyimide, a polyamideimide, a polybenzimidazole polymer, a polyurethane, a polyphenylene sulfide, a polyphenylene oxide, a polysulfone, or a polyfluoroethylene.
Claim 11
Dependent Claim
34 words
A composite according to claim 1 wherein said base material is composed of a polyamide, a polyimide, a polyamideimide, a phenol polymer, a polybenzimidazole polymer, a polyphenylene sulfide, a polyphenylene oxide or a polysulfone.
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) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |