Al_2O_3-Cr_2O_3砖显微结构对抗渣性能的影响  

Effect of microstructure on slag resistance of Al_2O_3-Cr_2O_3 bricks

作　　者：孙红刚[1] 李鹏涛[1] 付建莹 闫双志[1] 王刚[1] 耿可明[1] 

机构地区：[1]中钢集团洛阳耐火材料研究院有限公司先进耐火材料国家重点实验室,河南洛阳471039

出　　处：《耐火材料》2014年第3期188-193,共6页Refractories

基　　金：973计划前期研究专项(2012CB724607)

摘　　要：分别采用静态坩埚抗渣法和回转抗渣法,对w(Cr2O3)=10%的A和B两种Al2O3-Cr2O3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Al2O3-Cr2O3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Al2O3-Cr2O3材料抗渣性能的有效途径。The slag resistance of two Al2O3-Cr2O3 bricks （with 10 mass% Cr2O3 ） A and B were researched using static crucible method and rotary slag method, respectively. The results show that,two Al2O3-Cr2O3 bricks have similar properties such as apparent porosity, bulk density ,thermal shock resistance, and chemical compositions. Brick B has higher strength than brick A. Compared with brick B：brick A has smaller inner pores, because the white corundum aggregates in brick A are smoother and denser with continuous particle size distribution ;Al2O3-Cr2O3 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 improve the slag resistance of Al2O3-Cr2O3 materials.

关 键 词：Al2O3-Cr2O3砖 抗渣性 显微结构 静态坩埚法 回转抗渣法 

分 类 号：TQ175[化学工程—硅酸盐工业]