Reinforcement of Very Porous SiC Ceramics Prepared by SHS by Adding Nanometric SiC Powder in the Reactive Compact

摘要

Highly porous SiC ceramics (=80%)were prepared by a process that involved heating at 15°C/min and SHS between silicon and carbide.The addition of 1 to 10 weight % of nanometric SiC powder in the starting mixture facilitated the reaction between the reactants and improved the mechanical resistance of the final product.An increase in the amount of SiC added had no influence on the relative pore volume but led to a decrease in the average pore size,which can be modulated from 10 to 1 mum.