Stiochiometric silicon carbide fibers from thermo-chemically cured polysilazanes
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C01B-031/36
C04B-035/626
C08G-077/54
D01F-009/10
C08G-079/08
C04B-035/622
C01B-035/14
C01B-021/068
C01B-021/064
C08G-077/62
출원번호
US-0037151
(2011-02-28)
등록번호
US-9045347
(2015-06-02)
발명자
/ 주소
Pope, Edward J. A.
Hill, Christopher L.
Brabham, Carl N.
King, Jerry M.
Morkunas, Bernard T.
출원인 / 주소
General Electric Company
대리인 / 주소
General Electric Company
인용정보
피인용 횟수 :
0인용 특허 :
8
초록▼
A novel polycrystalline stoichiometric fine SiC fiber substantially free of impurities is produced using a novel pre-ceramic polymer. The pre-ceramic polymer is prepared by reacting a mixture of chlorodisilane, boron trichloride, and a vinyl chlorodisilane with an excess of hexamethyldisilazane to f
A novel polycrystalline stoichiometric fine SiC fiber substantially free of impurities is produced using a novel pre-ceramic polymer. The pre-ceramic polymer is prepared by reacting a mixture of chlorodisilane, boron trichloride, and a vinyl chlorodisilane with an excess of hexamethyldisilazane to form the pre-ceramic polymer resin, which may then be melt-spun, cured, pyrolyzed and heat-treated to obtain the finished SiC fiber. The manufacturing process for the production of the fine SiC ceramic fiber allows for flexibility with respect to cross-linking, in that low-cost thermal treatments may replace more complex methods, while obtaining fibers with improved materials properties as compared to currently available SiC fibers.
대표청구항▼
1. A method comprising: reacting a mixture of chlorodisilane (CDS), boron trichloride, and a vinyl chlorodisilane with hexamethyldisilazane (HMDS) to form a pre-ceramic polymer resin. 2. The method of claim 1, wherein the mixture further comprises a compound selected from the group consisting of 1,1
1. A method comprising: reacting a mixture of chlorodisilane (CDS), boron trichloride, and a vinyl chlorodisilane with hexamethyldisilazane (HMDS) to form a pre-ceramic polymer resin. 2. The method of claim 1, wherein the mixture further comprises a compound selected from the group consisting of 1,1,3,3, tetraphenyldisilazane and 1,3 divinyltetramethyldisilazane, in the range of 5 to 35 percent by weight. 3. The method of claim 2, wherein the CDS comprises a component of the mixture in the range of 30 to 60 percent by weight. 4. The method of claim 2, wherein the boron trichloride comprises a component of the mixture in the range of 2 to 10 molar percent. 5. The method of claim 1, wherein the vinyl chlorodisilane comprises a component of the mixture in the range of 0.5 to 10 percent by weight. 6. The method of claim 1, wherein the mixture further comprises a rheology modifier in the range of 1 to 15 percent by weight. 7. The method of claim 6, wherein the rheology modifier is selected from the group consisting of: 1,1,3,3-tetrachloro-1,3-disilabutane, vinyltrichlorosilane, 2,2,4,4,6,6-hexachloro-2,4,6-trisilaheptane, trichlorosilane, and silicon tetrachloride. 8. The method of claim 6, further comprising adding the rheology modifier in an amount effective for obtaining a melt-spinning temperature of the pre-ceramic polymer resin in a range of about 100 to 180° C. 9. The method of claim 1, further comprising melt-spinning the pre-ceramic polymer resin to obtain a pre-ceramic fiber. 10. The method of claim 9, further comprising cross-linking the pre-ceramic fiber to obtain a cross-linked fiber. 11. The method of claim 10, wherein cross-linking the pre-ceramic fiber is performed under tension to obtain a straight cross-linked fiber. 12. The method of claim 10, wherein cross-linking the preceramic fiber is performed by thermal curing at least partly at temperatures less than 300° C., without chemical or electron beam irradiation curing. 13. The method of claim 10, wherein cross-linking the preceramic fiber is performed by at least one of the following: thermal curing at less than 1200° C. in an inert atmosphere, e-beam curing, chemical cross-linking, plasma curing, or exposure to decaborane vapor. 14. The method of claim 10, further comprising pyrolyzing the cross-linked fiber up to about 1400° C. to obtain a near stoichiometric SiC ceramic fiber having a microcrystalline structure. 15. The method of claim 14, further comprising exposing the cross-linked fiber to a mixture of a noble gas and hydrogen during the pyrolyzing step. 16. The method of claim 14, further comprising heat-treating the near stoichiometric SiC ceramic fiber in the range of 1400° C. to 2200° C. to obtain a heat-treated stoichiometric SiC ceramic fiber substantially free of boron, nitrogen, and oxygen. 17. A method comprising: reacting a mixture of chlorodisilane (CDS), boron trichloride, vinyl chlorodisilane and vinylphenyldichlorosilane with hexamethyldisilazane (HMDS) to form a pre-ceramic polymer resin. 18. A method comprising: reacting a mixture of chlorodisilane (CDS), boron trichloride, vinyl chlorodisilane and divinyldichlorosilane with hexamethyldisilazane (HMDS) to form a pre-ceramic polymer resin. 19. A method comprising: reacting a mixture of chlorodisilane (CDS), boron trichloride, vinyl chlorodisilane and dichloromethylvinylsilane with hexamethyldisilazane (HMDS) to form a pre-ceramic polymer resin.
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이 특허에 인용된 특허 (8)
Baney Ronald H. (Midland MI) Gaul ; Jr. John H. (Midland MI), High yield silicon carbide from alkylated or arylated pre-ceramic polymers.
Deleeuw David C. (Midland MI) Lipowitz Jonathan (Midland MI) Rabe James A. (Midland MI), Preparation of substantially polycrystalline silicon carbide fibers from methylpolydisilylazanes.
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