Stoichiometric silicon carbide fibers from thermo-chemically cured polysilazanes
AssigneeGeneral Electric Company
InventorsEdward J. A. Pope, Christopher L. Hill
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Abstract
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.
Claims18
A method comprising:
- reacting a mixture of chlorodisilane (CDS), boron trichloride, vinyl chlorodisilanes, and a rheology modifier, with a mixture of hexamethyldisilazane (HMDS) and 1,3 divinyltetramethyldisilazane in a 1:2.5 molar ratio to form a pre-ceramic polymer resin.
A method comprising:
- reacting a mixture of chlorodisilane (CDS), boron trichloride, vinyl chlorodisilane and vinylphenyldichlorosilane, and a rheology modifier, with a mixture of hexamethyldisilazane (HMDS) and 1,3 divinyltetramethyldisilazane in a 1:2.5 molar ratio to form a pre-ceramic polymer resin.
A method comprising:
- reacting a mixture of chlorodisilane (CDS), boron trichloride, vinyl chlorodisilane and divinyldichlorosilane, and a rheology modifier, with a mixture of hexamethyldisilazane (HMDS) and 1,3 divinyltetramethyldisilazane in a 1:2.5 molar ratio to form a pre-ceramic polymer resin.
A method comprising:
- reacting a mixture of chlorodisilane (CDS), boron trichloride, vinyl chlorodisilane and dichloromethylvinylsilane, and a rheology modifier, with a mixture of hexamethyldisilazane (HMDS) and 1,3 divinyltetramethyldisilazane in a 1:2.5 molar ratio to form a pre-ceramic polymer resin.
Dependencies are inferred from the claim text.