工艺参数对熔盐法制备Bi_4Ti_3O_(12)的影响  

The effect of calcination temperature and salt quantity on anisotropic microstructure of Bi_4Ti_3O_(12) powder prepared by molten salt methods

作　　者：高峰[1] 张昌松[1] 洪荣子[1] 张慧君[1] 田长生[1] 

机构地区：[1]西北工业大学材料学院,陕西西安710072

出　　处：《材料科学与工艺》2007年第5期610-613,618,共5页Materials Science and Technology

基　　金：航空科学基金资助项目(03G53036);陕西省自然科学基金资助项目(N6CS0001);西北工业大学英才计划基金资助项目(04XD0108).

摘　　要：为了获得片状粉体用于无铅压电陶瓷晶粒的定向生长,采用NaCl-KCl熔盐法制备了各向异性的片状Bi4Ti3O12粉体,研究了预烧温度和熔盐含量对粉体的显微组织结构和形貌各向异性的影响,计算了粉体径向尺寸与厚度尺寸的比值以表征粉体的各向异性.研究表明:随着预烧温度的升高,粉体尺寸不断增加,各向异性逐渐增大,最佳预烧温度为950℃;采用熔盐法可制备出纯Bi4Ti3O12相粉体,随熔盐含量增加,钛酸铋粉体尺寸及各向异性程度明显增大,并在烧结后的Bi4Ti3O12陶瓷中有织构产生.Plated-like Bi4Ti3O12 powder with anisotropy was prepared by NaCI - KCI molten salt method. Effects of calcination temperature and salt quantities on anisotropic microstructure of Bi4Ti3O12 powder were in- vestigated. The rate of radial size to thickness size of plated-like Bi4Ti3O12 powder was calculated to express the degree for anisotropy. The results show that the Bi4Ti3O12 particle size and the degree of anisotropy in- crease with the increasing calcination temperature and molten salt quantities. The best calcination temperature is 950 ℃. The textured Bi4Ti3O12 ceramics with plated-like grain can be obtained by sintering Bi4Ti3O12 pow- der with large anisotropy at 1100 ℃.

关 键 词：熔盐法 预烧温度 各向异性 织构 

分 类 号：TN304[电子电信—物理电子学]