ดูบทความ

The effect of sillimanite sand as a replacement for quartz and alumina/cordierite glass-ceramic for feldspar was studied. Compositional variations were due to the gradual incorporation of alumina in place of cordierite glass-ceramic. Increased replacement of cordierite glass-ceramic by alumina (20%) increased the flexural strength by 100%, giving a value of 195 MPa. Elastic modulus, microhardness and fracture toughness also showed sharp increases compared with values for conventional triaxial whiteware compositions. Improvement in mechanical properties was attributed to the presence of sillimanite and alumina particles present as fracture-resistant dispersoids in a viscous glassy matrix. Increased fracture behaviour is due to minimization of the glassy phase and limiting the size of Griffith's flaws.