Preparation of tetragonal CaOZrO_2 nano-powder by chemical coprecipitation method

摘要

With zirconium oxychloride, nitrate of lime and ammonia as raw materials, nano-powder of CaO-ZrO_2 was prepared by chemical coprecipitation method. By use of azeotropic distillation processing, chemical coprecipitation precursor was obtained. Phase transformation of the precursor was observed at the temperature of 593. 81℃ and 1 234. 56℃ respectively with DTA analyses. Phase structure was analyzed through XRD and Raman spectra. The average particle size of tetragonal zirconium oxide powder was 9. 8 and 43. 7 nm after calcination at 600 and 1 100℃ respectively which was tested by TEM and BET analyses. Furthermore, the influences of the doping of nitrate of lime and the average particle size of zirconium oxide on the stability of tetragonal zirconium oxide were also discussed.