Patent ID: 7419700

Claim:
A process for making carbon-ceramic brake discs with reduced porosity, with at least 50% of the pores of the carbon-ceramic brake discs being filled with particles having an average diameter of from 1.0 nm to 10 nm, which particles contain oxides of elements from groups IIIb, IVb, IIIa and IVa of the periodic table of the elements, wherein in the first step, a carbon-fiber reinforced porous carbon body is infiltrated with liquid or gaseous silicon, with at least partial reaction of the carbon with the silicon to form silicon carbide to produce a carbon fiber reinforced material with a matrix which matrix contains silicon carbide, in the form of a carbon-ceramic brake disc, and in the second step, the carbon-ceramic brake discs are treated with a solution of organic compounds of elements from groups IIIb, IVb, IIIa and IVa of the periodic table or mixtures of such compounds, the cited organic compounds being present as sole in an organic solvent, after removal from the sol bath the brake discs treated in this way are drained and then dried in an oven at a heating rate of between 30 K/h and 300 K/h under air or protective gas and are then tempered at a final temperature of between 350° C. and 800° for between 20 minutes and 120 minutes.