碳酸盐前驱物制备Y_2O_3超细粉及透明陶瓷

Fabrication of Unltrafine Yttria Powders and Transparent Yttria Ceramics Using Carbonate Precursors

以Y(NO3)3和NH4HCO3为原料,通过向Y(NO3)3溶液中滴加NH4HCO3的方式制备了化学组成为Y2(CO3)3·2H2O的先驱沉淀物。研究了先驱沉淀物煅烧过程中的物相变化。先驱沉淀物1100℃煅烧4h后得到了平均粒径为60nm的无团聚Y2O3超细粉体。所得粉体不添加任何添加剂,在1700℃下真空烧结4h得到了透明Y2O3陶瓷。

Yttrium nitrate and ammonium hydrogen carbonate were used as starting materials. Y2(CO3)3·2H2O was precipitated by dripping the precipitant solution into the mother solution. Phase transformation of precipitation precursor during calcining was investigated. A fine and low-agglomeration yttria powder was obtained by calcinate the carbonate precursor at 1100 ℃ for 4 h. The mean size of particle of the powder is about 60 nm. The yttria powder prepared by the present method was sintered into a transparent body by a vacuum sintering at 1700 ℃ for 4 h without any additives.