Thermal flows influence on the change of temperature stresses in surface and inner layers of refractories

Abstract

The work is devoted to the study of the heat fluxes effect on refractory materials and the temperature stresses with a temperature gradient. These parameters were determined using experimental setup allows to investigate the micro- and -macro level structural processes of a material. Macro- and microstructural studies have shown that a heat flow intense and appeared thermal stresses can contributes to the formation of structural defects and the rupture of intercrystalline bonds. Thermal stresses and the changeable loads occurring during this process can form complex structures in the material in the form of disconnected blocks separated by pores. Electron microscopic studies of structural and phase transformations under the exposure of heat pulse fluxes showed a layer-by-layer change in the internal structure with the formation of microcracks at temperatures from 500 °C to 1500 °C and heating rates in the range from 5 °C/min to 45 °C/min. It is identified that the change of temperature stresses depends on the phase changes during thermal effect on the refractory material.