Effect of Sintering Atmosphere and Carbon Content on Properties of Porous Ceramic

Abstract

The mullite bonded SiC porous ceramic products were prepared by pressing, molding, drying, pre sintering and sintering with alumina (Al2O3), silica (SiO2), carbon black(CB), silicon carbide (SiC), sodium carboxymethyl cellulose solution (CMC) as raw materials. The effects of sintering atmosphere and carbon black content on the flexural strength, porosity and microstructure of ceramics were investigated. The result shows that: The best sintering atmosphere of the mullite bonded SiC porous ceramic prepared is in coke bed condition; When the content of mullite is 20 % and the content of carbon black is 10 %, the flexural strength of the ceramic is 15 MPa, and the porosity is 42.6 %. At this time, the ceramic has the best performance.