【摘要】 采用引入有机添加剂的超强碱共沉淀法可制备出粉末粒子尺寸为10nm左右的高纯纳米多晶氧化锆粉末。通过控制适当的工艺条件,得到了室温稳定的纳米四方/立方多晶氧化锆粉末。用X射线荧光光谱、X射线衍射、透射电镜、粒度分析仪等手段对粉末性能进行了表征。实验结果表明:超强碱共沉淀法所制备的粉末具有纯度高、氯离子等杂质少等特点;该粉末在室温和小于873K热处理时,均以稳定的立方或四方相存在;经873K处理的粉末粒子尺寸为10nm左右;在1123K处理后,形成固溶完全的稳定纳米四方多晶氧化锆粉末,粒子尺寸小,分散性好,粒度分布窄。与其它湿化学方法相比,添加聚合物的超强碱共沉淀法具有工艺操作简单、节约资源和环境污染小的优点。更多还原

【Abstract】 Nano sized tetragonal polycrystals zirconia powders were prepared by coprecipitation in a super alkaline medium with organie addition. The properties of zirconia nanoparticles were studied with the aid of X ray fluorescence analysis (XRF),X ray diffraction (XRD), transmission electron microscopy(TEM), particle size analysis, etc. The results show that the powders are of high purity and low chlorion content. the addition of polymer in the super alkaline condition favors a uniform reaction system enables reaction product dispersion and eliminates impurites.The main phase is tetragonal/cubic zirconia and less monoclinic zirconia is found in the powders after igniting in the temperature range of 343 K to 1 123 K. The particle size of the powder after calcining at 873 K for 3 hours is about 10 nm, the shape is approximately round with a narrowly distribution of about 0.48 μm. Compared with other wet chemical methods, the polymer assisted super alkaline chemical coprecipitation method has many advantages, such as simplicity of processing,ease of operation,low energy consumption, environmental pollution.更多还原