PHYSICAL AND MECHANICAL PROPERTIES OF NANOSTRUCTURED CERAMICS BASED ON AL2O3 TOUGHENED YSZ

10.25712/ASTU.1811-1416.2025.01.008

Abstract

In the conducted work, the physical and mechanical properties of ceramics based on corundum reinforced with zirconium dioxide stabilized with yttrium oxide were investigated. The studied material was obtained on the basis of mechanically activated nanodispersed powders of these components. The following pressing pressures were used in the work: 50, 100, 200 and 300 MPa. The obtained blanks were sintered in a high-temperature furnace at a temperature of 1700 ℃ in an air environment. When conducting scanning electron microscopy with mapping of elements, the presence of a corundum matrix with a uniformly distributed phase of a solid solution of zirconium dioxide and yttrium oxide in it was established. After sintering, a fine-grained structure with a predominant particle size of 1-9 μm was observed in the studied materials. It was found that a pressure of 300 MPa is the limiting pressure for pressing these ceramic batches, above which pressing defects may occur. At this pressure, the highest relative density of the material among those studied was achieved – 85.12%. It was found that by changing the pressing pressure, it becomes possible to achieve the properties of materials in a wide range and adapt them to the required operating conditions. Thus, it was found that when sintering the blanks obtained in the specified range of pressing pressures, Young's moduli varied within the range from 126 to 297 GPa, and the indentation hardness from 2.25 to 7.95 GPa.