Method for producing ceramic fibers of a composition in the SiC range and for producing SiC fibers
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
D01D-010/02
D02J-013/00
D01D-005/04
C04B-035/571
C04B-035/622
C04B-035/626
C04B-035/634
C08G-077/50
D01F-006/78
D01F-009/10
출원번호
US-0699089
(2015-04-29)
등록번호
US-9885126
(2018-02-06)
우선권정보
DE-10 2009 055 429 (2009-12-30)
발명자
/ 주소
Sitter, Sandra
Reiter, Birgit
출원인 / 주소
BJS Ceramics GmbH
대리인 / 주소
Greenberg, Laurence A.
인용정보
피인용 횟수 :
0인용 특허 :
8
초록▼
A method for producing ceramic fibers of a composition in the SiC range, starts from a spinning material that contains a polysilane-polycarbosilane copolymer solution. The spinning material is extruded through spinnerets in a dry spinning method and spun through a spinning duct into green fibers, an
A method for producing ceramic fibers of a composition in the SiC range, starts from a spinning material that contains a polysilane-polycarbosilane copolymer solution. The spinning material is extruded through spinnerets in a dry spinning method and spun through a spinning duct into green fibers, and the green fibers are subsequently pyrolyzed. Accordingly, the polysilane-polycarbosilane solution contains between 75 wt. % and 95 wt. %, in particular between 80 and 90 wt. %, of an indifferent solvent, and the spinnerets have a capillary diameter between 20 and 70 μm, in particular between 30 and 60 μm, in particular between 40 and 50 μm.
대표청구항▼
1. A method for producing ceramic fibers with a composition in an SiC range formed from a spin dope containing a polysilane-polycarbosilane copolymer solution, which comprises the steps of: providing the spin dope containing the polysilane-polycarbosilane copolymer solution comprising from 75% by we
1. A method for producing ceramic fibers with a composition in an SiC range formed from a spin dope containing a polysilane-polycarbosilane copolymer solution, which comprises the steps of: providing the spin dope containing the polysilane-polycarbosilane copolymer solution comprising from 75% by weight to 95% by weight of an inert solvent;extruding the spin dope through spin nozzles in a dry spinning process with 50 to 50,000 spin nozzles and spun through a spinning duct to produce green fibers, wherein the spin nozzles have a capillary diameter in a range of 20 to 70 μm; andpyrolyzing the green fibers to produce ceramic fibers. 2. The method according to claim 1, which further comprises carrying out the dry spinning process at a draw rate in a range of 50 m/min to 1,000 m/min. 3. The method according to claim 1, which further comprises setting a viscosity of the spin dope in a range of 0.1 to 6 Pas. 4. The method according to claim 1, which further comprises carrying out the dry spinning process at shear rates in a range of 10,000 s−1 to 60,000 s−1. 5. The method according to claim 1, wherein the spin dope contains a spinning aid selected from the group consisting of polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyacrylonitrile and poly(4-vinyl pyridine). 6. The method according to claim 5, which further comprises supplying a spinning aid fraction in an amount of from 0.5% to 10% by weight. 7. The method according to claim 1, which further comprises setting a spinning duct temperature to be in a range of 40° C. to 160° C. 8. The method according to claim 7, which further comprises flushing the spinning duct with an inert flushing gas that is free of solvent. 9. The method according to claim 8, which further comprises moving the inert flushing gas in a same direction as the ceramic fibers. 10. The method according to claim 1, wherein the inert solvent is a saturated hydrocarbon selected from the group consisting of n-pentane, n-hexane, cyclohexane, n-heptane, and n-octane, an aromatic hydrocarbon selected from the group consisting of benzene, toluene, o-xylene, and syn-mesitylene, a chlorinated hydrocarbon selected from the group consisting of methylene chloride, chloroform, carbon tetrachloride, 1,1,1-trichloroethane, and chlorobenzene, or an ether selected from the group consisting of diethyl ether, diisopropyl ether, tetrahydrofuran, and 1,4-dioxane or a mixture of two or more of these inert solvents. 11. The method according to claim 1, which further comprises carrying out the pyrolyzing step in an inert atmosphere or in a reducing atmosphere at temperatures in the range of 700° C. to 1,700° C. 12. The method according to claim 1, which further comprises sintering the pyrolyzed fibers at temperatures in a range of 1,000° C. to 1,500° C. 13. The method according to claim 1, which further comprises: providing the polysilane-polycarbosilane copolymer solution in a range of 80% by weight to 90% by weight of the inert solvent; andproviding the spin nozzles to have the capillary diameter in a range of 40 to 50 μm. 14. The method according to claim 1, which further comprises carrying out the dry spinning process at a draw rate in a range of 100 to 750 m/min. 15. The method according to claim 1, which further comprises carrying out the dry spinning process at a draw rate in a range of 200 to 500 m/min. 16. The method according to claim 1, which further comprises setting a viscosity of the spin dope in a range of 0.5 to 4 Pas. 17. The method according to claim 1, which further comprises carrying out the dry spinning process with from 100 to 30,000 spin nozzles. 18. The method according to claim 1, which further comprises carrying out the dry spinning process with from 200 to 2,000 spin nozzles. 19. The method according to claim 1, which further comprises carrying out the dry spinning process at shear rates in a range of 20,000 to 40,000 s−1. 20. The method according to claim 5, further comprising supplying a spinning aid fraction in an amount of from 1% to 5% by weight. 21. The method according to claim 5, further comprising supplying a spinning aid fraction in an amount of from 2.5% to 4% by weight. 22. The method according to claim 1, which further comprises setting a spinning duct temperature to be in a range of 50° C. to 100° C. 23. The method according to claim 11, which further comprises: selecting the inert atmosphere from the group consisting of nitrogen and argon;selecting the reducing atmosphere from the group consisting of a gas mixture consisting of argon, hydrogen, nitrogen, carbon monoxide, at least one carrier gas and at least one reducing gas; andsetting the temperatures in the range of 900° C. to 1,300° C.
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이 특허에 인용된 특허 (8)
Matsuhisa Yoji,JPX ; Kibayashi Makoto,JPX ; Yamasaki Katsumi,JPX ; Okuda Akira,JPX, Carbon fibers, acrylic fibers, and production processes thereof.
Frechette Francis J. (Tonawanda NY) Storm Roger S. (Clarence NY) Venkatswaren Viswanathan (Amherst NY) Andrejcak Michael J. (Niagara Falls NY) Kim Jonathan J. (Williamsville NY), Process for making silicon carbide ceramic fibers.
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