COMBINING MACROPORES OF A FIBROUS SUBSTRATE BY HOMOGENEOUS NUCLEATION

摘要

The present invention relates to a process for filling macropores of a porous fibrous substrate by forming carbon grains, characterized in that a fluid composition containing tetramethylsilane and a dilution fluid is diffused within the substrate under conditions of temperature comprised between between 650 and 1100 ° C and under pressure with an initial pressure lower than the critical pressure of tetramethylsilane and the dilution fluid, preferably less than or equal to 2 MPa, and for maintaining the tetramethylsilane and the dilution fluid in the subcritical state and spontaneously initiating uniform phase nucleation within the macropores of the substrate from tetramethylsilane to directly form the carbon grains.