烧结法制备氟硅云母玻璃陶瓷  

Fabricating fluorosilicic mica glass - ceramic by sintering

作　　者：吴舜[1] 王忠义[1] 曹小刚[2] 田杰谟[2] 

机构地区：[1]西安第四军医大学口腔医学院修复科,陕西省西安市710032 [2]清华大学新型陶瓷与精细工艺国家重点实验室,北京市100084

出　　处：《中国美容医学》2003年第5期458-461,共4页Chinese Journal of Aesthetic Medicine

基　　金：国家863课题资助项目(2002AA326090)

摘　　要：目的:采用烧结法制备齿科CAD/CAM用氟硅云母玻璃陶瓷切削块。方法:玻璃基础配方质量分数为SiO_2(50-60)％、K_2O(9-14)％、MgO(6-12)％、MgF_2(6-13)％、ZrO_2(0-5)％、Al_2O_3(0-5)％、P_2O_5(0-5)％、B_2O_3(0-3)％。根据差热曲线确定析晶温度,采用凝胶成型,分别在900℃、960℃、1000℃和1040℃进行烧结,测定体积收缩率。通过X射线衍射分析鉴定了烧结体晶相组成,采用扫描电镜对烧结体进行了微观结构观察。结果:随着烧结温度升高,收缩率增加,晶体由立方变为扁平;不同温度烧结的烧结体析出晶相相同,都是四氟硅云母;烧结温度高的烧结体中析出的晶体直径和径厚比较大。结论:该配方玻璃具有较好的烧结性能,烧结机制为非典型的无定形相粘性流动传质机,烧结过程中存在粘性流动传质和晶体生长两种现象。烧结时应采取高温烧结热制度。Objective To fabricate fluorosilicic mica glass-ceramic blanks used for CAD/CAM dental restorations by sintering . Methods The parent glass studied consists essentially, in weight percent as calculated from the batch, of 50% -60% SiO2, 9% -14% K2O, 6% -12% MgO, 6% -13% MgF2, 0% -5% ZrO2, 0% -5% Al2O3, 0% -5% P2O5 and 0% -3%B2O3. The nucleation and crystallization temperatures were determined by differential thermal analysis (DTA). The glass specimens were formed by gelcasting and submitted to heat treatment at 900℃,960℃,1 000℃ and1040℃, respectively, and analyzed by X-ray diffraction (XRD) to determine the crystalline phases. The microstructure of the experimental glass-ceramic was investigated by scanning electron microscopy(SEM) . Results The relationship between shrinkage rate and sintering temperature showed that the increase of sintering temperature leads to the increase of the shrinkage rate in the range from 900℃ to 1040℃. The XRD showed the same crystalline phase, K2Mg5Si8O20F4, precipitated in the glass powder compact sintered at different temperature. The microstructure of the experimental glass-ceramic exhibited grain shape changes from spherical to plate like as crystallization temperature went up. Improving crystallization temperature was increase the grain size, aspect ratio of the mica. Conclusion The glass has good sinterability and should be sintered at 1040℃ to get a satisfied result.

关 键 词：烧结法 制备 氟硅云母 玻璃陶瓷 牙科材料 

分 类 号：R783.1[医药卫生—口腔医学]