ZnO,ZnO-Fe_2O_3晶核剂对微晶玻璃显微结构的影响  

Effect of the Crystal Nucleus of ZnO and ZnO-Fe_2O_3 on Glass - Ceramics Microstructure

作　　者：徐晓虹[1] 褚颖[1] 孙淑珍[1] 邵建兵[2] 陈安民[3] 

机构地区：[1]武汉理工大学材料学院,武汉430070 [2]苏州非金属研究设计院,苏州215000 [3]华中科技大学同济医学院附属同济医院,武汉430030

出　　处：《硅酸盐通报》2004年第3期24-27,共4页Bulletin of the Chinese Ceramic Society

基　　金：湖北省科委重点攻关项目(2001-5987).

摘　　要：分析了在K2O-MgO-CaO-SiO2-P2O5-F系统可切削微晶玻璃中,ZnO,ZnO与Fe2O3复合晶核剂对可切削微晶玻璃显微结构的影响。制备的3种试样组分是:一份基础组分,另两份分别添加了ZnO和ZnO-Fe2O3晶核剂。试样均在1400℃下保温1h熔制。根据差热结果制定了晶化温度制度。采用XRD和SEM分析了晶化样品相组成及显微结构。同时测定了试样的性能。结果表明:ZnO可促进玻璃晶化后形成具有晶粒长径比大,相互交织的框架状显微结构,有利于提高样品的强度和韧性。在ZnO与Fe2O3复合晶核剂共同作用下,晶核形成量增多,晶粒变小,抗拉强度及硬度增加,但切削性能降低。The effect of ZnO and ZnO - Fe2O3 on microstructure in machinable glass - ceramic system of K2O -MgO - CaO - SiO2 - P2O5 - F was studied in this paper. Three glass compositions prepared: a base composition and two compositions with addition of ZnO and ZnO - Fe2O3 respectively. The compositions were melted at 1400℃ for 1h. Differential thermal analyses were performed on the glass up to 1400℃. Samples were treated at various temperatures. The crystalline phases were analyzed by X -ray differaction(XRD). The microstructure was investigated by scanning electron microscopy (SEM) . The physical properties were also measured. The results show that ZnO and ZnO - Fe2O3 can make great impact on microstructure . The addition of ZnO is efficient in impoving framework structure and a micro - morphology with a large aspect ratio and interlocking, which are benefical to improving strength and toughness. ZnO -Fe2O3 leads to more crystal nucleus, larger strength , hardness and worse machinability.

关 键 词：ZNO ZnO-Fe2O3 晶核剂 微晶玻璃 显微结构 析晶 晶化 强度 韧性 切削性能 

分 类 号：TQ171.733[化学工程—玻璃工业] R318.08[化学工程—硅酸盐工业]