The SiO₂-CaO-Al₂O₃-Na₂O glass ceramics were prepared by the melting-sintering method. For samples with a CaO/SiO₂ ratio of 0.23, wollastonite was the only crystal phase after heat treatment for 2h in the temperature range of 800–1000 °C, and a maximum flexural strength of 99.39 MPa can be achieved at 900 °C. When the sintering time was extended from 2 h to 40 h at 800 °C, the metastable phase Na₂CaSiO₄ first appeared, but then disappeared as the heat treatment continued. The maximum hardness and flexural strength were achieved at the sintering time of 20 h in this case. Furthermore, when the CaO/SiO₂ ratio was increased from 0.23 to 0.45 under the same heat treatment conditions (800 °C for 20 h), the main crystalline phase transformed from wollastonite to Na₂CaSiO₄, besides nepheline (NaAlSiO₄) and SiO₂. The existence of the nepheline enhanced the mechanical properties of glass ceramics.

通过熔融烧结法制备了SiO ₂ -CaO-Al ₂ O ₃ -Na ₂ O玻璃陶瓷。对于CaO / SiO ₂比为0.23的样品，硅灰石是在800-1000°C的温度下热处理2小时后唯一的晶相，在900°C时可以达到99.39 MPa的最大抗弯强度。当烧结时间在800°C下从2 h延长到40 h时，亚稳相Na ₂ CaSiO ₄首先出现，但随着热处理的继续而消失。在这种情况下，在20 h的烧结时间可达到最大硬度和抗弯强度。此外，当CaO / SiO ₂在相同的热处理条件（800°C，20 h）下，硅的比例从0.23增加到0.45 ，除了霞石（NaAlSiO ₄）和SiO ₂以外，主要的晶相也从硅灰石转变为Na ₂ CaSiO ₄。霞石的存在增强了玻璃陶瓷的机械性能。