Effect of Different Precursors on Preparation of Yttria-Stabilized Zirconia Nanopowders via Polyacrylamide Gel Method
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％.
polyacrylamide gel methodzirconiananopowdersyttria-stabilized zirconia ceramics
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