Crystallization and microstructural characterization of ZrO2-Y2O3-TiO2 nano-sized powders
Nanocomposites, which were composed of the dispersoids and matrix grains both of nanometer size, showed additionally attractive function due to the peculiar role of nano-sized phases in physical and mechanical properties.In the zirconia-rich end of the titania phase equilibrium diagram, TiO2 is known to dissolve into tetragonal ZrO2 and act as a stabilizing agent in the similar manner to Y2O3 and CeO2.Therefore, ZrO2-Y2O3-TiO2 could be an interesting challenger. However such a ternary system is not well studied. In this work,TiO2 doped yttria-zirconia nano powders are prepared by a coprecipitation method, with particle sizes of 10-15 nm. The effects of TiO2 content and calcining temperature on phase structure, grain size, lattice parameter and distortion are studied. The XRD results show that only t-ZrO2 phase is found when powders are calcined at 600℃. The dopants TiO2 inhibits the increase of crystallite size and phase transformation of ZrO2-Y2O3 from meta-stable phase of tetragonal to thermally stable phase of monocline, also makes the crystal lattice distortion increase.
ZrO2-Y2O3-TiO2 Nano-sized powder Crystallization Phase transition Lattice distortion
张永胜 胡丽天 胡天昌 陈建敏
中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000;中国科学院研究生院,北京100039 中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州 730000
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）