In-situ visualization of high temperature slag corrosion process for alumina-magnesia refractory

Abstract

The stringent service environment of refractory, which is composed of complex photo-thermal radiation, limits the evaluation of its corrosion process and corrosion mechanism. The visualization of interaction between refractory and slag at the temperature range of 1350∼1600 °C was realized based on the development of high-temperature resistant speckles combined with digital image correlation technology. The corrosion processes of alumina-magnesia refractories can be divided into three stages: slag penetration, refractory dissolution, and formation of new precipitates. The relationship between corrosion and corrosion processes induced strain was established: the stress caused by slag penetration and refractory dissolution was about 1.29 times that of the formation of new precipitates, such as CA6. With the quantification and identification of slag penetration and corrosion area using the full-field chemo-mechanical strain distribution on the refractory surface, a new method for precise research and real-time evaluation of corrosion behavior of refractory under extreme environment is established.