Research Information System
JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, vol.38, no.4, pp.2477-2486, 2023 (SCI-Expanded)
Magnesia (MgO) based brick type refractories are widely used in basic high temperature processes, especially in steel production, with their positive properties such as good refractoriness, resistance to high temperatures and high chemical stability in basic environments. Although the "brick" types of MgO are widely used, the "castable" applications have not developed at the same pace. This is because MgO is hydrated in an aqueous medium. In this study, the effect of chemical composition on the physical, mechanical and corrosion properties of magnesia-based castable refractories containing tabular alumina in different proportions was investigated. MgO-based pourable mixtures with 0,-3,-6 and-10 wt% Tabular Alumina were prepared and their free flow suitability was determined by self-flow test. According to the results; 6 wt% and-10 Tabular Alumina doped castables, passed the test and its suitability for self-flowing was determined. However, in order to be compared with each other, all mixtures were shaped in vibrating molds. The shaped samples were sintered by firing at 1600 degrees C after a slow curing regime for effective dehydration and drying of MgO. Physical tests such as bulk density, apparent porosity and water absorption determination, mechanical tests such as cold compressive strength test, and chemical corrosion tests such as slag-refractory corrosion test were applied to the fired samples. The findings obtained as a result of characterization analyzes such as XRD and SEM/EDX were presented and analyzed comparatively. As a result of these studies; By revealing the effects of tabular alumina additive on MgO based castable refractory materials, the limits of self-flowing property were tried to be determined.