Synthesis of Nanocrystalline Zirconium Dioxide Stabilized with Yttrium Oxide for Low-Temperature Sintering

摘要

Technology for the synthesis of nanocrystalline zirconium dioxide powder stabilized with yttrium oxide by joint deposition is developed. This technology makes it possible to sinter ceramics based on this powder at temperatures below 1400℃. Characteristics of the zirconia powder (depending on the synthesis conditions) are investigated using X-ray diffraction, the thermal desorption of nitrogen, and electron microscopy. It is revealed that the ultrasonic (US) effect achieved when washing the gel-like powder, as well as crushing the powder after drying and calcination, make it possible to decrease the degree of its agglomeration and decrease the agglomerate size. It is established based on the data of the thermochemical analysis that a decrease in the heating rate to the isothermal holding temperature during synthesis can decrease the liabUity of the ceramics made from the nanocrystalline zirconia powder to zonal sintering.