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Characteristics of Y-TZP Ultrafine Powders

Xu Yueping Guo Jingkun Li Baoshun Huang Xiaoxian Feng Chude (Shanghai Institute of Ceramics,Academia Sinica)  
Three different methods were developed for the preparation of ZrO(OH)_2 pow-ders.With DTA and X-Ray spectra,phase transformation processes,which werecarried out from ZrO(OH)_2(amorphous)to ZrO_2(t)at 450℃ and then to ZrO_2(t)+ZrO_2(m) in the range of 450~750℃,Were analyzed.The activation energy ofthe phase transformation from amorphous ZrO(OH)_2 to ZrO_2(t) is 238.4kJ/mol.By X-Ray diffractionline broadening,TEM and surface activity measurement,characteristics of Y-TZP powders were studied.The results illustrated:with the in-crease of temperature,the particle size increased while the surface activity decreased.After having compared three different kinds of powders,we can find those po-wders,washed by alcohol,have high surface activities and less agglomerates.
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