不同前驱体对聚丙烯酰胺凝胶法制备氧化钇稳定氧化锆纳米粉体的影响  

Effect of Different Precursors on Preparation of Yttria-Stabilized Zirconia Nanopowders via Polyacrylamide Gel Method

作　　者：胡春 余煜玺 赵德森 骆兵 龚财 Hu Chun;Yu Yuxi;Zhao Desen;Luo Bing;Gong Cai(Fujian Key Laborary of Advanced Materials,College of Materials,Xiamen University,Xiamen 361005,China;Fujian Changting Golden Dragon Rare-Earth Co.,Ltd,Longyan 300309,China)

机构地区：[1]厦门大学材料学院,福建省特种先进材料重点实验室,福建厦门361005 [2]福建省长汀金龙稀土有限公司,福建龙岩300309

出　　处：《中国稀土学报》2024年第6期1132-1139,I0003,共9页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(51675452)资助。

摘　　要：采用聚丙烯酰胺凝胶法制备氧化钇稳定氧化锆(YSZ)纳米粉体。分别以ZrOCl_(2)与YCl_(3),Zr(NO_(3))_(4)与Y(NO_(3))_(3)作原料合成凝胶前驱体,对两种凝胶的热分解过程及YSZ粉体的物相组成、形貌和烧结性能进行分析和表征。结果表明:不同前驱体对聚丙烯酰胺凝胶的热分解过程影响不同:以Zr(NO_(3))_(4)和Y(NO_(3))_(3)为前驱体和以ZrOCl_(2)和YCl_(3)为前驱体制得的凝胶内有机物最终热分解完全的温度分别为680和692℃。研究结果还表明:前驱体的种类影响YSZ粉体的晶化温度:以ZrOCl_(2)和YCl_(3)为前驱体制备YSZ粉体时会在较低温度产生四方相氧化锆,在800℃时YSZ粉体内会转变出部分单斜相;而以Zr(NO_(3))_(4)和Y(NO_(3))_(3)为前驱体制备YSZ粉体时,虽然体系内四方相氧化锆晶化温度较高,但四方相稳定性较好。此外,两种不同前驱体均能制备出晶粒尺寸较小的YSZ粉体,且粉体内各元素的分布均匀,以Zr(NO_(3))_(4)和Y(NO_(3))_(3)为前驱体制得的YSZ粉体团聚程度更小,烧结的YSZ陶瓷平均晶粒更小,相对密度可达97.4%。Yttria-stabilized zirconia(YSZ)nanopowders were synthesized via the polyacrylamide gel method using zirconium oxychloride and yttrium chloride,as well as zirconium nitrate and yttrium nitrate,as precursors.The thermal decomposition process of the gels,as well as the phase composition,morphology,and sintering properties of the YSZ powders,were thoroughly analyzed and characterized.Our findings reveal that the type of precursor used has a significant impact on the thermal decomposition process of the polyacrylamide gels.Specifically,the complete thermal decomposition temperature of xeorgel obtained with zirconium nitrate and yttrium nitrate as precursors is 692℃,while that obtained with zirconium oxychloride and yttrium chloride as precursors is 680℃.The findings also reveal that the type of precursor affects the crystallization temperature of YSZ powders.When YSZ powders was prepared with zirconium oxychloride and yttrium chloride as precursors,the tetragonal phase zirconia is produced at a lower temperature,with some monoclinic phase transforming in YSZ powder at 800℃.On the other hand,the tetragonal phase is more stable when YSZ was prepared with zirconium nitrate and yttrium nitrate as precursors,albeit produced at a higher temperature.Furthermore,the two different precursors can prepare YSZ powder with small grain size and uniform distribution of elements within the powder.But the YSZ powders synthesized from the inorganic salts of zirconium nitrate and yttrium nitrate exhibit a narrower particle size distribution and less agglomeration,resulting in a smaller average grain size after sintering into YSZ ceramics with a relative density of 97.4%.

关 键 词：聚丙烯酰胺凝胶法 氧化锆 纳米粉体 氧化钇稳定氧化锆陶瓷 

分 类 号：TQ174.4[化学工程—陶瓷工业]