Structure formation and degradation of partially stabilized zirconium dioxide

• Published in: Journal of the European Ceramic Society Vol. 19; no. 6; pp. 945 - 947
• Main Authors: Makarenko, A.N, Belous, A.G, Pashkova, Y.V
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 01.01.1999; Elsevier
• Subjects: Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; grain size; Powders; powders chemical preparations; X-ray methods; Y 2O 3; ZrO 2; ZrO 2; grain size; X-ray methods; Y 2O 3; powders chemical preparations; Phase transformation; Heat treatment; Yttrium Oxides; Chemical preparation; Stabilized zirconia; Oxide ceramics; Powder; Polymorphism
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/S0955-2219(98)00350-1

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-ZrO 2 transition takes place in sequentially precipitated hydroxides, and the m→t-ZrO 2 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 ZrO 2 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-ZrO 2 transformation, decreases with increasing amount of Y 2O 3 and cubic modification of ZrO 2 in heat treatment products and in the case of coprecipitation of hydroxides