Patent ID: 6214078
Filing Date: 2001-04-10
Classification: B01D

Abstract:
A permeable refractory product comprising a matrix of recrystallized silicon carbide having a porosity between 15% and 40% by volume, said matrix being formed by heating in an inert atmosphere a cast preform comprising a mixture of silicon carbide grains having a trimodal particle size distribution comprising from about 5% to about 20% by weight coarse particles having a grit size of from about 55 to about 65, from about 25% to about 50% by weight coarse particles having a grit size of from about 40 to about 50, and from about 25% to about 55% by weight fine particles having an average particle size of from about 0.5 to about 25 .mu.m, said heating causing sublimation of said fine particles and a gaseous phase recrystallization to bond said coarse particles into a monolithic single crystal structure.