球形纳米氧化锆粉末的制备

Preparation of ZrO_2 spherical nanometer powders

以二甲苯为油相,span-80为表面活性剂,Zr(NO3)4(3Y)水溶液为水相的W／O乳浊液,采用尿素均匀沉淀结合法制备四方相ZrO2(3Y)纳米粉。利用正交实验方法研究W／O乳浊液和尿素均匀沉淀结合法合成ZrO2(3Y)纳米粉的工艺参数对粉末粒径的影响,用XRD,TEM,BET和Raman光谱等分析手段对粉末及其前驱体进行分析和表征。得出最佳工艺条件为:水相在乳浊液中的体积分数为15％,Zr(NO3)4与CO(NH2)2的量比为1:8,反应温度为120℃,反应时间为3 h。利用最佳工艺条件所得的四方相ZrO2(3Y)纳米粉球形度良好,分散性优异,粉末的平均粒径约为50nm。

Tetragonal phase ZrO2 nano-powders containing 3% Y2O3 were prepared via the coupling route of W/O emulsion with urea homogenous precipitation, in which xylol was used as the oil phase, span-80 as the surfactant, and an aqueous solution containing zirconium as the water phase. The effect of technical conditions of nanometer-size ZrO2 synthesis by the coupling route of W/O emulsion with urea homogenous precipitation particle size was systematically studied via orthogonal test. The ZrO2 powders and the precursor powders were analyzed and characterized by XRD, TEM, BET and Raman spectrum. The results show that the optimum technical conditions are as follows： The volume percent of water phase is 15%; The tool ratio of Zr（NO3）4 and CO（NH2）2 is 1 ;8; The reaction temperature is 120 ℃ and the reaction time is 3 h. Tetragonal phase ZrO2 nanostructured powders containing 3% Y203 via the optimum technical conditions possesse excellent spherical shape and excellent dispersing, and the average size is about 50 um.