The compositions of basic glasses is decided according to the compositions of the point in CaSiO3-CaAl2Si2O8-SiO2 triangle field of CaO-Al2O3-SiO2 system, on the basis of which akind of glass is made through using fly...The compositions of basic glasses is decided according to the compositions of the point in CaSiO3-CaAl2Si2O8-SiO2 triangle field of CaO-Al2O3-SiO2 system, on the basis of which akind of glass is made through using fly-ash as the main component, and TiO2 is added to boththe basic glasses and the fly-ash glasses. DTA, XRD and SEM results show that, when theyare subjected to heat treatment, pure CaO-Al2O3-SiO2 glasses, either containing TiO2 orcontaining no TiO2, crystallize only in surface and the crystals which grow from surface tointerior are white. In eontrast, fly-ash glasses, either containing TiO2 or containing noTiO2,crystallize in whole and the crystals which come from the glasses containing TiO2 areyellow and consequently the crystals which come from the glasses containing no TiO2 areblack.TiO2 is used as nucleation agent in either pure CaO-Al2O3-SiO2 glasses or fly-ashglasses, its effect is quite limited. TiO2 can increase the viscosity at low temperatures anddecrease the viscosity at high temperatures, and especially TiO2 can be used as changingcolour agent in fly-ash glasses.展开更多
文摘The compositions of basic glasses is decided according to the compositions of the point in CaSiO3-CaAl2Si2O8-SiO2 triangle field of CaO-Al2O3-SiO2 system, on the basis of which akind of glass is made through using fly-ash as the main component, and TiO2 is added to boththe basic glasses and the fly-ash glasses. DTA, XRD and SEM results show that, when theyare subjected to heat treatment, pure CaO-Al2O3-SiO2 glasses, either containing TiO2 orcontaining no TiO2, crystallize only in surface and the crystals which grow from surface tointerior are white. In eontrast, fly-ash glasses, either containing TiO2 or containing noTiO2,crystallize in whole and the crystals which come from the glasses containing TiO2 areyellow and consequently the crystals which come from the glasses containing no TiO2 areblack.TiO2 is used as nucleation agent in either pure CaO-Al2O3-SiO2 glasses or fly-ashglasses, its effect is quite limited. TiO2 can increase the viscosity at low temperatures anddecrease the viscosity at high temperatures, and especially TiO2 can be used as changingcolour agent in fly-ash glasses.
