La_2O_3-Y_2O_3-ZrO_2低团聚纳米复合陶瓷粉末的制备  

Synthesis of La_2O_3-Y_2O_3-ZrO_2 composite ceramic nanopowder with low agglomeration

作　　者：周伍喜[1] 李松林[1] 刘鹤安[1] 何轶伦[1] 刘怀菲[1] 汤盛龙[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2011年第4期934-939,共6页Journal of Central South University:Science and Technology

基　　金：湖南省自然科学基金重点项目(10JJ2037);中南大学粉末冶金国家重点实验室创新基金资助项目(200902)

摘　　要：以ZrOCl2.8H2O、Y(NO3)3.6H2O和La2O3为原料,聚乙二醇(PEG)为分散剂,无水乙醇/水(醇水体积比为5:1)和水为溶剂,在溶胶和溶液体系中采用反向共沉淀方法,制备0.6%La2O3-4.473%Y2O3-ZrO2(LaYSZ,摩尔分数)纳米复合陶瓷粉末。通过透射电镜、扫描电镜、X线衍射等表征。结合胶体稳定性的DLVO理论分析以醇水为溶剂制备的LaYSZ粉末团聚程度低、粒径细小的原因。研究结果表明:以醇水为溶剂时,随着加热反应时间增加LaYSZ粉末的比表面积增加,加热反应7 h,采用反向滴淀方式制备的LaYSZ粉末的粒径约为15 nm,粉末团聚少;以水为溶剂时,采用反向滴淀方式制备的LaYSZ粉末粒径约为100 nm,粉末团聚严重。0.6%La2O3-4.473%Y2O3-ZrO2（LaYSZ,mole fraction） composite ceramic nanopowder was synthesized by reverse co-precipitation method in ethanol/water（the volume ratio of alcohol to aqueous of 5：1） or water solvent using ZrOCl2.8H2O,Y（NO3）3·6H2O and La2O3 as raw materials and polyethyleneglycol（PEG） as dispersant.The LaYSZ powders were characterized by means of transmission electron microscope（TEM）,scanning electron microscope（SEM）,X-ray diffraction（XRD） analysis.The alternation in particle size and agglomeration of the LaYSZ powder prepared in alcohol/water mixed solvent were explained using DLVO theory of colloidal stability.The results show that the specific surface area increases with the increase of reaction time.When the heating time is 7 h the size of LaYSZ particles is about 15 nm with low agglomeration in alcohol/water solution compared to about 100 nm with serious agglomeration in water solution.

关 键 词：热障涂层 纳米粉末 稀土共掺杂二氧化锆 醇水溶剂 反向共沉淀 

分 类 号：TG174[金属学及工艺—金属表面处理]