温度及Y_2O_3对SG法制备ZrO_2相结构及粒度的影响

针对纳米ZrO2粉体粒径较小、比表面积大、极易发生团聚问题,以纳米ZrO2为研究对象,采用溶胶-凝胶(SG)法,以氧氯化锆为锆源,水为溶剂,Y2O3为稳定剂,PEG-6000为分散剂,主要研究烧结温度及Y2O3对制成的纳米ZrO2相结构及其粒度的影响.实验结果表明:经XRD分析,所制得的ZrO2试样主要为四方相结构,随着煅烧温度的升高,粉体粒径增大;SEM测试结果表明,在一定ZrO2陶瓷粉体粒度范围内,随着稳定剂Y2O3加入量的增加,粉体颗粒间的分散性有所改善.综合考虑对纳米ZrO2相结构及粒度的影响,确定最佳烧结温度为650℃,稳定剂Y的最佳加入量为7.5mol%,制备的ZrO2纳米粉体粒径尺度最佳,晶型稳定性好且分散性得到改善.

Effects of Temperature and Y_2O_3 on Phase Structure and Particle Sizes of ZrO_2 by Sol-Gel Method

In order to solve prone reunion caused by small particle size and big specific area of nano-ZrO2 powder,nano-ZrO2 was researched by Sol-Gel（SG） method.With zirconium oxychloride as zirconium source,water as solvent,Y2O3 as stabilizer,PEG-6000 as dispersant,the effects of sintering temperature and Y2O3 on phase structure and particle size of nano-ZrO2 were investigated.Experimental results indicate that the obtained ZrO2 samples are tetragonal phase structure by XRD analysis and the powder particle size increases with increasing calcination temperature.In a range of particle sizes of ZrO2 ceramic powder,the dispersibility of the powder particles improved with increasing Y2O3 stabilizer by SEM analysis.Considering the effects of phase structure and particle size,it is determined that the optimum sintering temperature is 650℃ and the optimum stabilizer dosage of Y2O3 is 7.5mol%Y.The prepared nano-ZrO2 powder has the optimum particle size,good crystal stability and improved dispersibility.