Structure formation and degradation of partially stabilized zirconium dioxide |
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| Affiliation: | 1. Laboratory of Environmental Process Engineering, Department of Chemical Engineering, Faculty of Process Engineering, University Salah Boubnider Constantine 3, P.O. Box 72, 25000 Constantine, Algeria;2. Faculty of Sciences and Applied Sciences, Department of Process Engineering, Larbi Ben M''hidi University, 04000 Oum El Bouaghi, Algeria |
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| Abstract: | The process of structure formation of partially stabilized zirconium dioxide powders during the heat treatment of precipitated zirconium and yttrium hydroxides and structure degradation in time depending on hydroxide precipitation method (mutual and sequential precipitation) has been investigated. During calcination, the t→m-ZrO2 transition takes place in sequentially precipitated hydroxides, and the m→t-ZrO2 transition takes place in coprecipitated hydroxides. It was noted that soft readily destroyable aggregates are formed during the heat treatment of sequentially precipitated hydroxides. This makes it possible to produce fine ZrO2 powders (d=50–100 nm) avoiding disaggregation and/or milling. It has been found that the zirconium dioxide degradation process, which is due to the t→m-ZrO2 transformation, decreases with increasing amount of Y2O3 and cubic modification of ZrO2 in heat treatment products and in the case of coprecipitation of hydroxides |
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