Effect of original powders on electrochemical property of Mg-PSZ ceramics
ZrO2 powders stabilized by 8％MgO(mole fraction)were prepared by solid-state sintering method and co-precipitation method,respectively,and 8％MgO-partially stabilized ZrO2 ceramics(8Mg-PSZ)were obtained by sintering at 1 600 ℃ for 2 h.The effects of the original powders on the phase content,density,microstructure,and ionic conductivity of the ceramics were investigated.The results show that the original powders morphology has a great influence on the properties of Mg-PSZ ceramics.The smaller particle size of the original powders,the lower degree of agglomeration,and the higher content(volume fraction)and density of tetragonal and cubic zirconia in Mg-PSZ ceramics,the higher the ionic conductivity.Using NaOH solution as precipitant,Mg-PSZ powders obtained by coprecipitation method have the best properties,the bulk density is 5.68 g/cm3,the activation energy is 1.24 eV in the testing range of 650～950 ℃,and the ionic conductivity can reach 4.79 mS/cm at 950 ℃.
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