Al2O3-Cr2O3砖显微结构对抗渣性能的影响

摘要

The slag resistance of two Al2 O3-Cr2 O3 bricks (with 10 mass%Cr2 O3 )A and B were researched using static crucible method and rotary slag method,respectively.The results show that,two Al2 O3-Cr2 O3 bricks have similar properties such as apparent porosity,bulk density,thermal shock resistance,and chem-ical compositions.Brick B has higher strength than brick A.Compared with brick B:brick A has smaller in-ner pores,because the white corundum aggregates in brick A are smoother and denser with continuous particle size distribution;Al2 O3-Cr2 O3 solid solution in brick A is smaller,crossing and forming net structure with small gaps,which reduces the penetration and wear of slag to refractories,meaning that brick A has better slag resistance than brick B.It’s obvious that optimizing microstructure is an effective way to im-prove the slag resistance of Al2 O3-Cr2 O3 materials.%分别采用静态坩埚抗渣法和回转抗渣法，对w（Cr2 O3）＝10％的A和B两种Al2 O3-Cr2 O3砖进行了抗渣性能对比。结果发现：两种砖的化学组成、显气孔率、体积密度和抗热震性相近，B砖强度优于A砖的。但由于与B砖相比，A砖内部气孔尺寸更小，所用电熔白刚玉骨料形貌平滑，较为致密，粒度呈连续式分布，且A砖中Al2 O3-Cr2 O3固溶体发育较小，相互交错，形成了孔隙较小的空间网状结构，这种显微结构显著降低了熔渣对耐火材料的渗透和破坏，使A砖的抗渣性优于B砖的。因此，制备微气孔化结构的制品是提高Al2 O3-Cr2 O3材料抗渣性能的有效途径。