M.M. Bućko

A study on preparation of Tetragonal Zirconia Polycrystals (TZP) in the TiO2Y2O3ZrO2 system

Abstract Hydrothermal techniques were used to prepare micropowders within the TiO 2 Y 2 O 3 ZrO 2 system. Phase compositions and particle sizes of the powders were determined. Monoclinic and tetragonal zirconia were the major phases. In compositions with high TiO 2 concentrations, ZrTiO 4 was found. Both TiO 2 and Y 2 O 3 affect crystallite sizes of the powders. The fracture toughness of the samples sintered at 1300°C was measured. The TZP bodies show good mechanical properties.

A TZP matrix composite with in situ grown TiC inclusions

Abstract A TiO 2 –Y 2 O 3 –ZrO 2 solid solution was prepared by the coprecipitation–calcination technique. The resulting powder of +100 m 2 /g specific surface area was mixed with a phenol-formaldehyde resin whose in situ thermal decomposition resulted in carbon formation. The reaction of the carbon and Ti coming from the solid solution gave TiC evenly distributed within the system. Hot-pressed samples showed hardness higher than conventional TZP bodies.