Abstract: Nano-sized zirconia powders were prepared by sol-gel method using ZrOCl2·8H2O as the starting material, NH3·H2O and NaOH solution as precipitants.Different stabilizers were added into the precursor.Tetragonal zirconia samples with different particle sizes and tetragonal phase content were obtained after filtration, drying and calcination.The particle size and phase composition of the powders were characterized by a laser nano particle analyzer and XRD respectively.The content of tetragonal phase and grain size were calculated using Scherer formula and crystal face formula.The relationship between tetragonal phase content and particle size of zirconia powders added into different stabilizers at room temperature was analyzed.The results indicate that Nano-zirconia powder stabilized with Y2O3 is finer in particle size and more uniformity in particle size distribution.After calcine at 400-1000 ℃ for 2 h, the critical particle sizes of phase transition of nano-zirconia powder stabilize with MgO, CaO, Y2O3 are respectively 24-28 nm, 26-33.6 nm, 18-22.6 nm , based on the relationship between tetragonal phase content and cumulative distribution of particle size in nano-sized zirconia powders.

Key words: Nano-sized zirconia powders were prepared by sol-gel method using ZrOCl2·8H2O as the starting material, NH3·H2O and NaOH solution as precipitants.Different stabilizers were added into the precursor.Tetragonal zirconia samples with different particle sizes and tetragonal phase content were obtained after filtration, drying and calcination.The particle size and phase composition of the powders were characterized by a laser nano particle analyzer and XRD respectively.The content of tetragonal phase and grain size were calculated using Scherer formula and crystal face formula.The relationship between tetragonal phase content and particle size of zirconia powders added into different stabilizers at room temperature was analyzed.The results indicate that Nano-zirconia powder stabilized with Y2O3 is finer in particle size and more uniformity in particle size distribution.After calcine at 400-1000 ℃ for 2 h, the critical particle sizes of phase transition of nano-zirconia powder stabilize with MgO, CaO, Y2O3 are respectively 24-28 nm, 26-33.6 nm, 18-22.6 nm , based on the relationship between tetragonal phase content and cumulative distribution of particle size in nano-sized zirconia powders.