Svitlychniy Y. Corundum ceramics, modified zirconia, with increased strength and thermal shock resistance

The research object - processes of the creation of stressed and microcracked structure of the corundum ceramics while zirconia introduction; the research purpose- the development of the corundum ceramics technology with zirconia additions with increased strength and thermal shock resistance from Ukrainian raw materials using traditional equipment; the methods - chemical, petrographic, roentgen-phase and electron-microscopic methods of analysis and standardized research procedures of properties of used materials and ceramics; theoretical and practical results -the possibilities of strength and thermal shock resistance of increase of the corundum ceramics while zirconia introduction are scientifically established, the effective method of material manufacture for constructive corundum ceramics with zirconia additions as well as domestic technology of corundum ceramics, modified by zirconia, with increased strength and thermal shock resistance are developed; the novelty - an influence of different methodsof introduction into corundum ceramics ZrO2 addition on processes of the phase and structure forming in fired examples of ceramics from positions of the increasing strength and thermal shock resistance and influence of processing factors on rheologocal properties of slips based on alumina with zirconia addition and casts from them are determined; the extent of introduction- the developed technology was introduced in Ukraine at OJSC "The Ukrainian research institute of refractories named after A.S. Berezhnoy", where the products output from corundum ceramics with zirconia additions of different configuration and dimension-types is realized; the field of application- crucible for palladium melting at temperatures up to 1700 °С, constructive elements, working under the conditions of tensile loads at temperatures 25°С above zero and 196°С below zero, as well as tubes for electric infra-red heating units.