METHOD FOR EVALUATING PEELING RESISTANCE OF ALUMINA-MAGNESIA QUALITY CASTABLE REFRACTORY

摘要

To provide a method for evaluating peeling resistance whether or not an alumina-magnesia quality castable refractory is peeled and worn.SOLUTION: A method for evaluating peeling resistance of an alumina-magnesia quality castable refractory in which the refractory has a residual linear change ratio after having been fired at 1,400°C or higher and 1,600°C or lower for 3 or more hours of 0% or more, includes: a step of heat-treating the castable refractory at a temperature T1 equal to or higher than a temperature at which a liquid phase of the refractory is generated for 3 or more hours; a step of measuring a coefficient of linear thermal expansion of the refractory while raising the refractory after heat treatment to a temperature T2 higher than the temperature T1 from a room temperature; a step of measuring a coefficient of linear thermal expansion of the refractory while cooling the refractory to the room temperature from the temperature T2; a step of calculating a differential value between the coefficient of linear thermal expansion in the temperature-raising step and the coefficient of linear thermal expansion in the cooling step at a temperature T3 equal to or lower than the T1; and a step of determining peeling resistance from the differential value.SELECTED DRAWING: Figure 1