Abstract
Effect and behavior of Al4SiC4 added to the MgO-C brick were investigated and discussed. The
following conclusions were obtained.
（1）The mass and strength increase gradually and the porosity decreases in the MgO-C brick with addition of
Al4SiC4 above 1000℃.
（2）Al4SiC4 reacts with CO gas to form spinel（MgAl2O4）and SiC above 1000℃. The formed SiC also reacts with CO gas to form forsterite（Mg2SiO4） above 1200℃. These reactions involve the increase of mass and volume which cause the texture densification.
（3）The bricks containing Al4SiC4 have high slaking resistance after heating, because Al4C3 and AlN are not
formed in the reaction processes.
（4）It is found that Al（g）, SiO（g）and Mg（g）form in the brick texture at the high temperature. The gases are
considered to disperse and condense in the pore, and then the texture is densified efficiently.
