THE INFLUENCE OF IN-SITE FORMATION SPINEL ON THE FRACTURE ENERGY OF ALUMINA-MAGNESIA REFRACTORY CASTABLES

摘要

The specific fracture energy (G_F) is a new parameter which can be used to predict the performance of refractory materials. The well known wedge splitting test (WST) method is used to test the fracture energy in this paper. This study focused on an evaluation of several characteristics of five refractory castables with similar chemical compositions but containing proportion of different row materials. The results show that, the quantity of in-site formation spinel in the castables exerts a significant influence on the matrix/aggregate interaction, different microstructure form in the castables, which caused the maximum load and fracture energy of the refractory castables have the same changing trend, increasing first and decresing afterward. It proves by the experiment that the thermal shock resistance of the castables shows the same tendencies with fracture energy.