Vacuum-Tight Corundum Ceramics VK94-1 Modified with Zirconium Dioxide

Abstract

In this article, we analyze the process of obtaining VK94-1 ceramics modified with zirconium dioxide ZrO₂ and determine its properties, such as apparent density, mechanical bending strength, and Vickers hardness (microhardness) in comparison with those of VK94-1 ceramics. The effect of changes in the share of zirconium dioxide in the samples on the above properties is shown. The influence of firing temperatures on the sintering of samples is studied. Samples with different component ratios of VK94-1/ZrO₂ (90/10, 80/20, and 70/30) were pressed using an isostatic pressing machine at a pressure of 150 MPa. Firing was carried out at different temperatures of 1500, 1550, and 1600°C in different firing media.