| abstract |
The invention relates to a preform for producing a component of a braking system, which preform is made of a fiber reinforced ceramic composite material obtained by forming and subsequently pyrolyzing a prepreg. This prepreg includes a fibrous mass impregnated with a polymer binder composition based on one or more resins selected from the group consisting of siloxane resins and silsesquioxane resins, and may optionally include one or more organic resins. . The siloxane resins include polysiloxanes and the silsesquioxane resins include polysilsesquioxanes. The above-mentioned polymeric binder composition is in the form of a liquid having a viscosity of 55,000 to 10,000 mPas at temperatures of 50 ° C to 70 ° C. The fiber-reinforced ceramic composite material comprises a ceramic matrix or partially ceramic, which develops in the interstices of the fibrous mass and which comprises silicon carbide and amorphous structures formed by Si-OC chains. The silicon carbide and Si-O-C chains previously mentioned were generated by the pyrolysis process on said polysiloxanes and / or said polysilsesquioxanes. The fiber-reinforced ceramic composite material has a porosity generated by pyrolysis on the polymeric binder composition of the prepreg. The invention further relates to a component of a braking system made wholly or partly from said preform, and a method for making a preform of a fiber reinforced ceramic composite material. |