US4916093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing continuous inorganic fiber consisting of Si, N and O
Assignee: Nippon Carbon Co Ltd
•
Filing: 1989-02-21
•
Granted: 1990-04-10
•
Expires: 2009-02-21
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
2026-11-08 02:32
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: 10
Claim 1
Independent Claim
111 words
A method for producing a continuous inorganic fiber consisting essentially 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; which comprises: (a) spinning a fiber from a polycarbosilane having a molecular weight of 800-50,000; (b) heating the spun fiber in an oxidizing atmosphere at 50°-400° C. or irradiating the spun fiber in an oxidizing atmosphere with 10 6 -10 10 R of the γ-ray radiation or 10 7 -10 10 Rad electron beam radiation to form an infusible fiber; and (c) heating the infusible fiber at a temperature of 800°-1,650° C. in a stream of ammonia gas.
Claim 2
Independent Claim
111 words
A method for producing a continuous inorganic fiber consisting essentially 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; which comprises: (a) spinning a fiber from a polycarbosilane having a molecular weight of 800-50,000; (b) heating the spun fiber in an oxidizing atmosphere at 50°-400° C. or irradiating the spun fiber in an oxidizing atmosphere with 10 6 -10 10 R of the γ-ray radiation or 10 7 -10 10 Rad electron beam radiation to form an infusible fiber; and (c) heating the infusible fiber at a temperature of 800°-1,650° C. in a stream of ammonia gas.
Claim 3
Dependent Claim
14 words
A method according to claim 1, wherein the fiber is spun from molten polycarbosilane.
Claim 4
Dependent Claim
17 words
A method according to claim 1, wherein the fiber is spun from a solution containing the polycarbosilane.
Claim 5
Dependent Claim
21 words
A method according to claim 1, wherein the stream of ammonia gas is a flow rate of at least 50 cc/min.
Claim 6
Dependent Claim
33 words
A method according to claim 1 wherein the spun fiber is heated in an oxidizing atmosphere under a tension of 1-500 g/mm 2 or irradiated under a tension of 1-500 g/mm 2 .
Claim 7
Dependent Claim
26 words
A method according to claim 1, wherein the infusible fiber is heated in a stream of ammonia gas under a tension of 1-5000 g/mm 2 .
Claim 8
Dependent Claim
24 words
A method according to claim 1, comprising the further step of heating the fiber at a temperature of 800°-1,650° C. in an inert atmosphere.
Claim 9
Independent Claim
132 words
A method for producing a continuous inorganic fiber consisting essentially 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, which comprises: (a) spinning a fiber from polycarbosilane having a molecular weight of 800-50,000; (b) heating the spun fiber in an oxidizing atmosphere at 50°-400° C. or irradiating the spun fiber in an oxidizing atmosphere with 10 6 -10 10 R of γ-ray radiation or 10 7 -10 10 Rad electron beam radiation under a tension of 1-500 g/mm 2 to form an infusible fiber; and (c) heating the infusible fiber under a tension of 1-5000 g/mm 2 at a temperature of 800°-1,650° C. in a stream of ammonia gas at a flow rate of at least 50 cc/min.
Claim 10
Independent Claim
132 words
A method for producing a continuous inorganic fiber consisting essentially 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, which comprises: (a) spinning a fiber from polycarbosilane having a molecular weight of 800-50,000; (b) heating the spun fiber in an oxidizing atmosphere at 50°-400° C. or irradiating the spun fiber in an oxidizing atmosphere with 10 6 -10 10 R of γ-ray radiation or 10 7 -10 10 Rad electron beam radiation under a tension of 1-500 g/mm 2 to form an infusible fiber; and (c) heating the infusible fiber under a tension of 1-5000 g/mm 2 at a temperature of 800°-1,650° C. in a stream of ammonia gas at a flow rate of at least 50 cc/min.
References Cited (Backward Citations)
GB717555A
Cited
GB954285A
Cited
DE1136315B
Cited
US3399979A
Cited
US3244480A
Cited
US3846527A
Cited
US4010233A
Cited
US3907954A
Cited
US3853567A
Cited
FR2190764A1
Cited
DE2236078A1
Cited
US3999835A
Cited
US4164528A
Cited
US4122155A
Cited
US4283376A
Cited
US4534948A
Cited
US4515742A
Cited
US4483839A
Cited
US4530825A
Cited
US4476234A
Cited
US4543344A
Cited
US4521393A
Cited
US4650773A
Cited
US4610917A
Cited
US4619905A
Cited
US4650837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-09 | 1993-10-09 | 1994-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-09 | 1997-10-09 | 1998-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-09 | 2001-10-09 | 2002-04-10 | $7700.00 | Window Closed / Lapsed |