Studies of the Crystallization Dynamics of Na_2O-CaO-Al_2O_3-SiO_2 Glass-Ceramics

Na_2O-CaO-Al_2O_3-SiO_2 glass-ceramics is a new kind of constructional material.It not only provides with good mechanical properties,but also possesses of good decorative effects.The kinetic parameters of this glass-ceramics were calculated by differential thermal analysis(DTA),and the crystallization kinetic of this glass-ceramics system was investigated.The results indicate that the crystallization activation energy(E) and kinetic crystallization parameter k(Tp) increase with increasing CaO content eventually.The crystalline indexes(n) are all less than 3 and indicate that for this glass-ceramic system the crystallization process is surface crystallization.