Sintering behavior of SiO_2-CaO-MgO (Na_2O) glass-ceramics system

摘要

The influence of some nucleating agents on the sintering, crystallization and mechanical properties of SiO_2-CaO-MgO (Na_2O) glasses was investigated. It was found that the glass-ceramic containing Fe_2O_3 and Cr_2O_3 had desirable sintering behavior and reached to an acceptable density. However, the sinterability of specimens was degraded by addition of CaF_2 + MoO_3 and/or V_2O_5 + MoO_3 through reduction of crystallization temperatures of glasses. In these cases increasing of firing temperature led to reduction of the transition metal oxides and bloating of specimens.