Effect of Zircon Addition on Properties of Corundum Porous Materials

This paper aims to improve the corrosion resistance of dispersive purging plugs. White fused corundum particles and fine powder, α-Al2O3micropowder, Cr2O3micropowder, Guangxi clay and zircon powder were used as the main raw materials. The mass ratio of white fused corundum particles and fine powder was fixed at 85 : 15, and 0, 1%, 2%, or 3%(by mass) of zircon fine powder was added to replace the same amount of white fused corundum fine powder. The corundum porous material was prepared by the particle stacking pore-forming method at 1 650 ℃ for 3 h. The effect of the zircon addition on the properties and microstructure of porous materials was investigated. The results show that: after adding zircon, the permeability of the porous material increases, the cold and hot strengths increase obviously, and the expansion rate after firing decreases. When the addition of zircon is 2%, the comprehensive performance of the specimen is optimal with the smallest linear change rate and the highest permeability.