Due to the small size of sintered fused alumina grains, there are a lot of pores in the particles, which is conducive to diffusion and mass transfer sintering. Some pores are excluded from the crystal along with the migration of substances along the grain boundaries, resulting in volume shrinkage and resulting in the firing line of the sample. The shrinkage rate increases with the increase of sintered fused alumina content, and the apparent porosity of the sample decreases with the increase of sintered fused alumina content.
The pure sintered fused alumina raw material has a fine-grained structure, high strength, and high sintering activity. The combination between the sintered fused alumina particles and the matrix in the brick is good, so the mechanical strength performance increases with the increase of the sintered fused alumina content.
The results of the static crucible slag resistance test show that sintered fused alumina can slow down the penetration of slag into bricks. There are two reasons for this result: one is that the sample with high content of sintered fused alumina has a lower apparent porosity, and the other is that the sintered fused alumina raw material particles The combination with the matrix is good, which hinders the penetration of slag into the brick.
