Effect of alumina on silicon carbide bodies with clay bonding

Components made of silicon carbide are very important ceramic products due to their good resistance against thermal shocks. Home made of such products having silicate bonding usually have various defects in their structures. In this research effects of alumina addition on the components made of silicon carbide with clay bonding have been investigated, in order to see its effects on mechanical and structural properties such as blistering. Addition of up to 15 weights %. Al2O3 improved thermal shock resistance and increased bending strength from 25 MPa to 32 MPa due to Al2O3 transformation to mullite. However, when the amounts of alumina exceed 15 weights % mechanical strength as well as resistance to thermal shock reduced due to reman ing of Al2O3 in the components after sintering