矾土基电熔锆刚玉对钢包用Al_2O_3-MgO浇注料性能的影响  

Influence of bauxite-based fused zirconia-corundum on properties of Al_2O_3-MgO castables

作　　者：张艳利[1] 贾全利[1] 叶方保[1] 

机构地区：[1]郑州大学高温功能材料河南省重点实验室,郑州450052

出　　处：《耐火材料》2008年第6期451-454,共4页Refractories

基　　金：河南省杰出人才创新基金资助项目(0621001400)

摘　　要：以特级矾土熟料(8～5 mm)、电熔亚白刚玉(5～3和3～1 mm)、电熔白刚玉(≤1 mm)为骨料,以白刚玉细粉(<0.088和<0.044 mm)、矾土基电熔锆刚玉(<0.088 mm)、电熔铝镁尖晶石(<0.044 mm)、电熔镁砂(<0.074 mm)、α-Al2O3微粉(≤5μm)和SiO2微粉(≤3μm)为基质,骨料与基质质量比为65∶35,固定锆刚玉与白刚玉粉总质量分数为16%不变,以矾土基电熔锆刚玉细粉等量替代白刚玉粉,研究了矾土基电熔锆刚玉粉质量分数(分别为0、4%、8%、12%和16%)对Al2O3-MgO浇注料物理性能及抗渣性的影响,并利用SEM和EDS对渣蚀后的试样进行显微结构及微区元素分析。结果表明:(1)矾土基电熔锆刚玉可以促进Al2O3-MgO浇注料的烧结,从而改善浇注料的常温物理性能;(2)矾土基电熔锆刚玉的引入对Al2O3-MgO浇注料的抗热震性影响不大;(3)矾土基电熔锆刚玉的引入对Al2O3-MgO浇注料的高温抗折强度和抗渣侵蚀性略有负面影响,这主要和矾土基电熔锆刚玉中的杂质在高温下生成液相有关。Al2O3-MgO castables were prepared by using special grade sintered bauxite （8 -5 mm）, sub-white fused corundum （5-3 and 3-1 mm） and white fused corundum （≤1 mm） as aggregate,and white fused corundum powder （≤0.088 and ≤0.044 mm）, bauxite-based fused zirconia-corundum （ZA） powder （≤0.088 mm）,fused spinel powder （≤0.044 mm）,fused MgO powder （≤0.074 mm）,α-Al2O3 ultra fine powder （≤5μm） and microsilica （≤3μm） as matrix. The mass ratio of aggregate and matrix is 65：35. Fixing the total content of ZA and white fused corundum powder at 16wt%,white corundum powder （0% ,4% ,8% ,12% and 16% ） was substituted by the same quantity of ZA powder,investigating the influences of ZA addition on the physical properties and slag corrosion resistance of Al2O3-MgO castables. The microstructure and spectrum composition were characterized by SEM and EDS. The results showed that=（1）ZA improved the sintering of the Al2O3-MgO castables,and thus enhanced the physical properties;（2）Thermal shock resistance of the castables was not obviously influenced by ZA powder; （3）The HMOR and slag corrosion resistance deteriorated slightly because the impurity in the ZA powders turned to liquid at high temperature.

关 键 词：矾土基电熔锆刚玉 Al2O3-MgO浇注料 钢包 物理性能 抗侵蚀性 

分 类 号：TQ175.715[化学工程—硅酸盐工业] TB383[一般工业技术—材料科学与工程]