Effect of Si powder on properties of corundum-mullite bricks.

The corundum-mullite bricks were prepared using brown corundum, α-AI₂O₃ powder, andalusite powder, and Guangxi white mud as raw materials. In order to improve the iron slag erosion and corrosion resistance of corundum-mullite bricks, 2 mass% Si powder was introduced into the corundum-mullite bricks, and the properties of the samples were compared before and after Si powder addition. The results show that compared with the corundum-mullite sample without Si powder, the sample with Si powder has uniform and small pores, and the apparent porosity decreases from 15.8% to 13.5%, the cold compressive strength increases obviously, the hot modulus of rupture increases by 5.6 times, the hot toughness and the iron slag corrosion resistance and the penetration resistance are obviously improved. [ABSTRACT FROM AUTHOR]