高浓度的水热法合成四方晶相的摩尔分数为3%的Y_2O_3-ZrO_2微粉

Preparation of Tetragonal 3mol% Y_2O_3-ZrO_2 Fine Powder by Hydrothermal Synthesis in Highly Concentrated Solution

本文介绍了采用高浓度的（相当于5mol/LZr）氧氯化锆为母盐溶液,在75℃下与氨水进行沉淀反应,然后进行水热反应来合成ZrO2微粉,最初制备的粉末是由原生的超微ZrO2晶粒构成的、暂时性的团聚球粒,放入水中后团聚粒子消失而形成半透明的溶胶,在250℃下干燥处理5h形成团聚粒子,再将其制成含有适量YCl3的悬浮体,加入5g尿素/L溶液,在90℃下加热2h后进行离心分离、水洗除去Cl-离子后进行微波干燥,最后在800℃下煅烧1h可得到一次粒径为42nm,团聚粒径为0.36μ,含3％Y2O3（摩尔分数）的单分散的四方晶型的ZrO2微粉。

The zirconia particles were prepared by precipitating reaction with ammonia in a high concentration solution (corresponding to about 5mol/LZr) at 75℃,and then by hydrothermal synthesis at 190℃. The first obtained particles were temporarily agglomerated spheres composed of primary ultrafine zirconia crystal. The agglomerated particles dispersed in water to form a translucent sol. Then they were made into the suspension with a proper con-ten of YCl3 when the translucent sol was form into the agglomerated particles after drying at 250 for 5h, The tetragonal zirconia particles containing 3 mol% Y2O3 with particle diameter 42nm were obtained by adding into 5 g urea/L solution,heating at 90℃ for 2h,fllowed by centrifugal separation, water-washing for removing Cl- ions, microwave dying and last by calcination at 800℃ for 1h.