Elasticity, Strength, and Other Related Properties of Some Refractory Castables

Young's modulus of elasticity, transverse strength, extensibility, and load resistance were determined at a series of test temperatures on six groups of laboratory-prepared refractory castables which had ( a ) no heat-treatment, ( b ) heat-treatment at 1050°C., and ( c ) heat-treatment at 1300°C. The data suggested that the alterations in composition that occur with a rise in temperature were related to corresponding changes in modulus of elasticity and strength. The effects of dehydration, conversion of amorphous alumina to γ-alumina, and silica inversions were evident. The cement content and temperature of operation as well as the heat-treatment of the castables affected all these mechanical properties to varying degrees.