US4650773A
Expired / Lapsed
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Continuous inorganic fiber consisting of Si, N and O and a method of producing the same
Assignee: Nippon Carbon Co Ltd
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Filing: 1985-04-26
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Granted: 1987-03-17
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Expires: 2005-04-26
Abstract
Abstract A continuous inorganic fiber consisting of Si, N and O has excellent physical, chemical and electrically insulating properties, is superior to carbon fiber in wettability with metal, is low in reactivity with metal, and can be used not only as a reinforcing fiber for fiber-reinforcing type metals and fiber-reinforcing type ceramics, but also in electrical insulating materials and in heat-resistant materials.
Inventors
- 👤 Kiyohito Okamura
- 👤 Mitsuhiko Sato
- 👤 Yoshio Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:12
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/10; C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/589; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
84 words
A continuous inorganic fiber consisting of Si, N and O in a composition ratio wherein the atomic ratio of N/Si is 1.3-0.5 and that of O/Si is 1.0-0.05, said fiber consisting essentially of amorphous fine particles, which consist of Si, N and O, or consisting of amorphous fine particles, which consist of Si, N and O, and crystal fine particles of at least one of Si 2 N 2 O and α-Si 3 N 4 having a particle size not larger than 500 Å.
Claim 2
Dependent Claim
84 words
A continuous inorganic fiber consisting of Si, N and O in a composition ratio wherein the atomic ratio of N/Si is 1.3-0.5 and that of O/Si is 1.0-0.05, said fiber consisting essentially of amorphous fine particles, which consist of Si, N and O, or consisting of amorphous fine particles, which consist of Si, N and O, and crystal fine particles of at least one of Si 2 N 2 O and α-Si 3 N 4 having a particle size not larger than 500 Å.
Claim 3
Independent Claim
80 words
A method of producing a continuous inorganic fiber consisting essentially of Si, N and O, comprising a step for producing an organosilicon polymer of polycarbosilane consisting mainly of an Si-C skeleton and having a molecular weight of 800-50,000; a step for spinning the polycarbosilane; a step for converting the spun fiber into an infusible fiber under tension or under no tension; and a step for heating the infusible fiber at a temperature of 800°-1,650° C. in an ammonia gas stream.
Claim 4
Independent Claim
80 words
A method of producing a continuous inorganic fiber consisting essentially of Si, N and O, comprising a step for producing an organosilicon polymer of polycarbosilane consisting mainly of an Si-C skeleton and having a molecular weight of 800-50,000; a step for spinning the polycarbosilane; a step for converting the spun fiber into an infusible fiber under tension or under no tension; and a step for heating the infusible fiber at a temperature of 800°-1,650° C. in an ammonia gas stream.
Claim 5
Independent Claim
112 words
A method of producing a continuous inorganic fiber consisting essentially of Si, N and O, comprising a step for producing an organosilicon polymer of polycarbosilane consisting mainly of an Si-C skeleton and having a molecular weight of 800-50,000; a step for spinning the polycarbosilane; a step for converting the spun fiber into an infusible fiber under tension or under no tension; and a step for heating the infusible fiber at a temperature of 800°-1,650° C. in an ammonia gas stream and then subjecting the fiber to a heat treatment under an inert gas atmosphere at a temperature being not lower than the above described heating temperature but being not higher 1,650° C.
Claim 6
Independent Claim
112 words
A method of producing a continuous inorganic fiber consisting essentially of Si, N and O, comprising a step for producing an organosilicon polymer of polycarbosilane consisting mainly of an Si-C skeleton and having a molecular weight of 800-50,000; a step for spinning the polycarbosilane; a step for converting the spun fiber into an infusible fiber under tension or under no tension; and a step for heating the infusible fiber at a temperature of 800°-1,650° C. in an ammonia gas stream and then subjecting the fiber to a heat treatment under an inert gas atmosphere at a temperature being not lower than the above described heating temperature but being not higher 1,650° C.
Claim 7
Independent Claim
77 words
A method of producing a continuous inorganic fiber consisting essentially of Si, N and O, comprising a step for producing an organosilicon polymer of polycarbosilane consisting mainly of an Si-C skeleton and having a molecular weight of 800-50,000, which is infusible in heating; a step for preparing a spinning solution of the polycarbosilane and spinning the spinning solution, and a step for heating the spun fiber at a temperature of 800°-1,650° C. in an ammonia gas stream.
Claim 8
Independent Claim
77 words
A method of producing a continuous inorganic fiber consisting essentially of Si, N and O, comprising a step for producing an organosilicon polymer of polycarbosilane consisting mainly of an Si-C skeleton and having a molecular weight of 800-50,000, which is infusible in heating; a step for preparing a spinning solution of the polycarbosilane and spinning the spinning solution, and a step for heating the spun fiber at a temperature of 800°-1,650° C. in an ammonia gas stream.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |