Sc_2O_3-Y_2O_3-ZrO_2纳米复合陶瓷粉末的制备  

Synthesis of Sc_2O_3-Y_2O_3-ZrO_2 Composite Ceramic Nanopowder

作　　者：何轶伦[1] 周伍喜 李松林[1] 刘怀菲[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 [2]自贡长城硬面材料有限公司,四川自贡643011

出　　处：《矿冶工程》2014年第1期100-102,共3页Mining and Metallurgical Engineering

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Sc2O3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)为溶剂,氨水为沉淀剂,采用正、反向共沉淀方法,控制体系pH=10,反应陈化12 h,凝胶干燥24 h,经600℃煅烧制得4.5 mol%Y2O3-ZrO2(YSZ)和0.6 mol%Sc2O3-YSZ纳米复合陶瓷粉末。通过透射电镜、X-射线衍射等表征,讨论分析以醇水为溶剂反向滴淀制备的ScYSZ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,采用反向滴淀方式制备的粉末的粒径约为20 nm,粉末团聚较松散;采用正向滴淀制备的粉末粒径约为30 nm,粉末形成硬团聚体。Using ZrOC12 · 8H20, Y（ NO3 ）3 · 6H20 and Sc203 as raw materials, polyethyleneglycol （PEG） as dispersant and NH3 · H20 as precipitant, composite ceramic nanopowders with 4.5 tool% YzO3-ZrO2 and 0.6 tool % Sc203-YSZ were synthesized by co-precipitation method of direct and back titration in ethanol/water （volume ratio of alcohol to water at 5：1 ）, with pH of 10 for the controlling system, 12 h aging, 24 h drying of the washed gel and being calcined at 600 ~C. The synthesized powders were characterized by means of transmission electron microscope （TEM） and X-ray diffraction（XRD）. The reasons that SeYSZ powder prepared by back titration in alcohol/water had low agglomeration and small particle size were discussed. The results show that the powder prepared by back titration method has a particle size of 20 nm and low agglomeration while that prepared by direct titration method has a particle size of 30 nm and high agglomeration.

关 键 词：热障涂层 纳米陶瓷粉末 稀土共掺杂二氧化锆 醇水溶剂 反向滴淀 正向滴淀 

分 类 号：TG174[金属学及工艺—金属表面处理]