Published on July 2016 | Materials Science

Effect of Monomers Content and their Ratio on Gelcasting of Fused Silica Ceramics

Fused silica ceramics with high flexural strength, and low warpage and shrinkage were casted using gelcasting, a near net shape fabrication technique. Methylacrylamide (MAM) and N,N-methylenebisacrylamide (MBAM) were used as monomers. The effects of monomers content (MAM and MBAM) and their ratio (MAM/MBAM) on the flexural strength, warpage and shrinkage rates on fused silica ceramics were investigated. The warpage and shrinkage rates of fused silica bodies decreased with increasing monomers content, while by increasing the ratio of monomers, warpage and shrinkage rates got increased. Flexural strength of the green body also decreased with increasing mononers content. With the increasing ratio of monomers, the flexural strength first increased and then decreased, indicating that there is an optimum value for the ratio of monomers. The maximum flexural strength obtained in this study was as high as 43.2 MPa.