熔融铸造法及烧结法氟云母玻璃陶瓷性能的比较

摘要

目的:研究不同制备工艺对齿科可切削氟云母玻璃陶瓷性能的影响.方法:采用熔融铸造工艺和烧结工艺制备K2O-MgO-MgF2-SiO2系统可切削氟云母玻璃陶瓷,采用XRD、SEM确定其晶相组成和微观结构,测试透射率、弯曲强度和脆性指数.结果: 2 种制备工艺制备的玻璃陶瓷主晶相均为四硅氟云母,晶相大小均为2～5 μm,径厚比6～7.烧结制备玻璃陶瓷晶相体积分数较高,透射率、脆性指数较低,弯曲强度较高.结论:针对氟云母玻璃陶瓷而言,烧结法制备工艺优于熔融铸造工艺.%Objective: To study the effects of the melt casting and the sintering methods on the machinability and other characteristics of K_2O-MgO-MgF_2-SiO_2 glass-ceramics. Methods: X-ray diffraction(XRD) and scanning electron microscopy (SEM)were used to examine the main crystal and the microstructure of the glass ceramics of the same composition which were made by melt casting and sintering methods, respectively. The transmissivity, flexural strength and brittleness index were observed respectively. Results: The glass ceramics made by two different methods have the same crystal, KMg_(2.5)Si_4O_(10)F_2, while the specimen prepared by the sintering method had lower transmissivity,better machinability and mechanical properties due to the higher mica volume percent. Conclusion; For production of fluoro-mica glass ceramics, sintering method has superiority compared to melt-casting method.