The influence investigation of moisture and pressure on the compressibility of mass from zirconia stabilized by yttrium oxide and the properties of samples from it

Abstract

The compressibility of mass with a particular composition — from fused zirconia, stabilized by ~ 10 % yttrium oxide, as well as the properties of samples from it depending on its moisture (2.5; 3.0; 3.5; 4.0; 4.5 %) and specific pressure (50, 75, 100 N/mm2) have been investigated. The optimum moisture content of the forming mass (3.5—4.0 %) and pressure (100 N/mm2) were established, providing fresh-formed samples with the maximum possible for the given mass apparent density of 4.78—4.79 g/cm3, dried — with an apparent density of 4.71—4.72 g/cm3 and with an apparent density, open porosity and cold crushing strength of the fired samples respectively 4.66—4.67 g/cm3, 21.0—21.4 %, 38.6—39.0 N/mm2. As a result of the carried out studies, the production technology of TsIS-1T brand products from fused zirconia, stabilized by ~ 10 % yttrium oxide, by the method of semi-dry pressing was improved. This technology ensures a reduction in open porosity of these products by ~ 2—3 % and an increase in their cold crushing strength by ~ 11.4 % (rel.) The use of these products in single crystal growing plants will provide their higher durability in service and the operation duration of these high temperature plants.