FORMATION OF HIGHLY-POROUS CERAMIC BASED ON SILICON-CARBIDE

Data for the effect of charge composition and characteristics of the s tarting silicon carbide powder and pore-forming agent on the formation of highly porous SiC-base ceramics are studied and summarized. It is shown that porous (up to 70%) polycrystal SiC materials obtained on th e basis of finely crystalline (3-5 mu m) silicon carbide with introduc tion of ammonium bicarbonate (grain size 0.1-0.2 mm) as a pore-forming agent into the initial charge have the best structural parameters wit h sufficient mechanical strength and high gas permeability.