Preparation of tetragonal CaO-ZrO2 nano-powder by chemical coprecipitation method
(1. Chemistry Department, Jishou University, Jishou 416000, China;
2. State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China)
2. State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China)
Abstract: With zirconium oxychloride, nitrate of lime and ammonia as raw materials, nano-powder of CaO-ZrO2 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 1234.56℃ 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 43.7nm after calcination at 600 and 1100℃ 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.
Key words: chemical coprecipitation method; CaO-ZrO2 nano-powder; phase transformation