水热法合成白榴石粉体  

HYDROTHERMAL SYNTHESIS OF LEUCITE POWDERS

作　　者：曾德朝 徐登翔 张翼[1,2] 吴建青[2] 

机构地区：[1]广东东鹏陶瓷股份有限公司,佛山528031 [2]华南理工大学材料学院,广州510640

出　　处：《中国陶瓷》2008年第10期7-10,共4页China Ceramics

基　　金：国家高技术研究发展计划(863计划)项目,编号:2002AA302204;广东省科技计划项目,编号:2001A1070102;广州市科技计划项目资助

摘　　要：以硅溶胶,九水合硝酸铝和硝酸钾为原料,采用水热法制备了白榴石前驱体。将前驱体经过热处理后合成了白榴石粉体,并与低温熔块混合制备了烤瓷粉。采用X射线衍射分析(XRD)、差热-热重(DTA-TG)、扫描电镜(SEM)和万能材料试验机对样品进行了表征。结果表明,将前驱体在1100℃煅烧后可以直接合成高纯白榴石粉体。合成的白榴石与低温熔块混合后,经烧成得到了具有白榴石均匀分布、颗粒较小的显微结构(平均粒径为1.3μm),加入了白榴石的烤瓷材料的平均强度和Weibull模数与低温熔块相比都有显著提高。Leucite precursor was prepared by hydrothermal method using silica sol, nona-hydrate aluminum nitrate and potassium nitrate as starting materials. Leucite powders were synthesized by calcining the precursor at different temperatures, and the powders of Percelain-Fused-to-Metal were fabricated by mixing the leucite powders with a low temperature frit. The samples were characterized by a X-ray dfffractometer （XRD）, scanning electron microscopy （SEM） and universal testing machine. The results showed that high purity leucite powders were synthesized directly at 1100℃ . The sintered porcelain of synthesized leucite powders and a low temperature frit exhibited a microstructure with uniformly dispersed leucite particles （average particle size 1.3 μ m）. The introduction of synthesized leucite powders significantly enhanced the strength and Weibull modulus of the sintered porcelain.

关 键 词：白榴石 水热法 牙科陶瓷 抗弯强度 

分 类 号：TQ164.6[化学工程—高温制品工业] TQ171