Abstract:

Al2O3-SiC-C castables were prepared with brown corundum as aggregate and fines (67%),SiC and pitch spheres (20% in total),active α-Al2O3 and silica fume (10% in total) as main raw materials.The effects of silica fume addition,the dispersing agents (sodium hexametaphosphate and sodium tripolyphosphate) and the types and additions of explosion-proof fibers on spalling resistance were tested respectively.The results showed that different construction thickness (weight) corresponded to different spalling resistance temperatures,the thicker the construction,the worse the permeability and the spalling resistance; in the tests,the increasing of silica fume was disadvantageous to spalling resistance,whereas the increasing of water did not have obvious influence on spalling resistance; the increasing of fibers or choosing low melting point fibers could greatly improve the spalling resistance of the castables.