초록 ▼

The present invention is a fiber reinforced ceramic matrix composite substrate with an integrated ceramic topcoat layer. The composite substrate is prepared by laminating a preceramic polymer impregnated fiber cloth, curing the laminate, and pyrolyzing the resulting substrate to an initial state. Th

The present invention is a fiber reinforced ceramic matrix composite substrate with an integrated ceramic topcoat layer. The composite substrate is prepared by laminating a preceramic polymer impregnated fiber cloth, curing the laminate, and pyrolyzing the resulting substrate to an initial state. The composite substrate is re-infiltrated with the preceramic polymer, cured, and pyrolyzed to an initial densification level. The topcoat layer is then integrated with the composite substrate by applying transition plies to an exterior surface of the composite substrate, forming a particulate slurry from a ceramic powder and the preceramic resin, and applying the particulate slurry to the transition plies. The transition plies-particulate slurry layup on the composite substrate is autoclave cured and pyrolyzed. The composite substrate is then re-impregnated with the preceramic resin matrix material, cureclave cured, and step pyrolyzed to a desired densification level.

대표청구항 ▼

[ What is claimed is:] [1.] An article comprising:a ceramic composite substrate derived by (a) fabricating said composite substrate by impregnating ceramic fiber cloth with a preceramic resin matrix material, laying-up a composite laminate, autoclave curing said composite laminate, and step pyrolyzi

[ What is claimed is:] [1.] An article comprising:a ceramic composite substrate derived by (a) fabricating said composite substrate by impregnating ceramic fiber cloth with a preceramic resin matrix material, laying-up a composite laminate, autoclave curing said composite laminate, and step pyrolyzing said composite substrate to an initial state, and (b) secondarily processing said composite substrate by re-impregnating said composite substrate with said preceramic resin matrix material, re-step curing said composite substrate, and re-step pyrolyzing said composite substrate to an initial densification level; anda ceramic topcoat layer integrated with said composite substrate derived by (a) applying a plurality of transition ceramic fiber cloth plies to an exterior surface of said composite substrate, (b) forming a particulate slurry from a ceramic powder and a preceramic resin, (c) applying said particulate slurry to said plurality of transition plies, (d) processing said ceramic topcoat layer on said composite substrate by autoclave curing said composite substrate and pyrolyzing said composite substrate, and (e) re-impregnating said composite substrate with said matrix material, cureclave curing said substrate composite, and step pyrolyzing said substrate composite to a desired densification level.