When the reaction products form as high melting point CA2, CA6 and MA spinel in a continuous solid phase it will clog the liquid channel and resist the further diffusion of fused slag in the brick.

The shortcoming of current slag cavity brick is presented . Its size is determined. The action of production method and gap ratio on its strength is studied in this paper.

This paper explains slag erosion mechanism of middle grade MgC brick based on petrographic analysis after the slag erosion, as well variation of the slag composition before and after the slag erosion.