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中文摘要：
本文采用尿素沉淀法合成了粒径约160nm的激光陶瓷用氧化钇粉微球。颗粒呈较规则球形，单分散性良好。通过对反应过程的系统研究，探讨了粉体前驱体微球的生长机理，并研究了硫酸铵对前驱体微球生长习性的影响。对前驱体微球的热力学性质进行了研究。采用X射线衍射仪，扫描电镜，透射电镜，TG-DTA等仪器对实验过程及实验结果进行表征和分析。得出了溶液升温速率和硫酸铵对于氧化钇粉体制备的影响。较高的升温速率有助于前驱体颗粒在较短的时间内聚集。5％硫酸铵的加入明显减小前驱体尺寸，且硫酸根在1000℃煅烧时分解防止氧化钇微球之间出现烧结颈。从而形成外形规则、单分散的氧化钇微球。
英文摘要：
Uniform sphere of Y2O3 with average diameter of 160 nm was synthesized via urea precipitation method. The particles are spherical and monedisperse. The growth mechanism of the precursor was analyzed, and the effect of （NH4 ）2SO4 on the growth habit of the precursor microspheres was studied. The thermodynamic properties were also investigated. X ray diffractometry, SEM, TEM, TG-DTA, etc, were performed to characterize the sample produced during the experiment. Higher heating rate was found to be important for the aggregation process of the precursor. Particle size of the Y2O3 powders was diminished as 5% （NH4）2SO4 was introduced into the precipitation system. Decomposition of SO2-at 1000℃ also prevented the necking phenomenon of the powders. Uniform spherical yttira powders were thereby prepared.
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