Dry prepreg for ceramic matrix composites
Assignee3M Innovative Properties Company
InventorsDaimon K Heller, Aaron R. Beaber, Amit J. Patel, Kari A. McGee, Henrik B. Van Lengerich, James M. Reimer
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Abstract
Dry prepregs for ceramic matrix composites are described. The dry prepregs comprise a tow or fabric of ceramic fibers infiltrated with preceramic matrix comprising low levels of an aqueous solvent. The preceramic matrix contains an inorganic portion and a binder system. Binder systems comprising a binder and a plasticizer for the binder are described.
Claims17
A dry prepreg comprising a tow of ceramic fibers infiltrated with a preceramic matrix comprising an inorganic oxide and an organic binder system, wherein the preceramic matrix comprises no greater than 4 weight percent of an aqueous solvent based on the total weight of the preceramic matrix;
- and wherein the organic binder system comprises a polymeric binder and a plasticizer for the polymeric binder, wherein the plasticizer is miscible with the polymeric binder or at least one portion of the polymeric binder and decreases the glass transition temperature or the complex modulus of the polymeric binder.
A method of making a dry prepreg comprising
- (i) infiltrating a tow of ceramic fibers with a ceramic matrix slurry comprising an inorganic oxide, an organic binder system, and an aqueous solvent, wherein the organic binder system comprises a polymeric binder and a plasticizer for the polymeric binder, wherein the plasticizer is miscible with the polymeric binder or at least one portion of the binder and decreases the glass transition temperature or the complex modulus of the polymeric binder;
- and
- (ii) drying the slurry to form the dry prepreg comprising the tow of ceramic fibers infiltrated with a preceramic matrix comprising the inorganic oxide and the organic binder system, wherein the preceramic matrix comprises no greater than 4 weight percent of the aqueous solvent based on the total weight of the preceramic matrix.
Dependencies are inferred from the claim text.