复合抗氧化剂加入量对Al_2O_3-SiC-C浇注料性能的影响  

Effect of composite antioxidant additions on properties of Al_2O_3-SiC-C castables

作　　者：李亚雄[1] 李享成[1] 朱伯铨[1] 

机构地区：[1]武汉科技大学耐火材料与高温陶瓷国家重点实验室培育基地,湖北武汉430081

出　　处：《耐火材料》2013年第5期345-347,共3页Refractories

基　　金：国家自然科学基金(50904048);973计划(2012CB722702)项目

摘　　要：以电熔棕刚玉为骨料，电熔棕刚玉粉、活性α-Al2O3微粉、黑碳化硅粉、球状沥青、SiO2微粉、纯铝酸钙水泥等为基质料，配以质量分数为2％、2．3％、2．6％、2．9％的复合抗氧化剂，搅拌均匀制备成Al2O3-SiC—C质浇注料。外加5％（埘）的水搅拌3～5min后，检测浇注料的流动性；经振动成型、养护、脱模、干燥后，于1500℃空气气氛中热处理3h，测定热处理后试样的质量损失率、体积密度、显气孔率、常温耐压强度、常温抗折强度和抗热震性。结果表明：随着复合抗氧化剂加入量（W）从2％增加到2．9％，浇注料的流动性变化不大并且保持较高的水平，显气孔率、体积密度和常温强度变化不大，质量损失率从1．14％减小到0．35％，氧化层厚度逐渐减小；复合抗氧化剂加入量为2．9％（W）的试样热震后耐压强度仍保持在70MPa左右，具有较好的抗热震性。The Al2O3-SiC-C castables were prepared using brown fused corundum as aggregate,brown fused corundum powder,active α-Al2O3 micropowder,black SiC powder,ball pitch,SiO2 micropowder and pure calcium aluminate cement, etc. as matrix,adding composite antioxidants （ 2% ,2.3% ,2.6% ,2.9%, in mass,the same hereinafter） and well mixing. The castables were mixed homogeneously for 3-5 min with 5% extra water,and then the flow values of the castables were determined. After vibratory moulding, cu- ring,demoulding and drying,the castables were fired at 1 500 ℃ for 3 h,and the mass loss rate,bulk den-sity,apparent porosity,cold crushing strength ,cold modulus of rupture and thermal shock resistance were determined. The results show that with the composite antioxidant addition increasing from 2%-2.9%, the flow value,apparent porosity, bulk density and cold crushing strength of the castables change a little, and the flow value keeps well ,the mass loss rate decreases from 1.14% to 0. 35% ,and the thickness of the ox-ide layer decreases;the cold crushing strength of the castables after two thermal shock cycles keeps at about 70 MPa with the composite antioxidant addition of 2.9% ,the thermal shock resistance is good.

关 键 词：抗氧化剂 铁沟料 AL2O3-SIC-C浇注料 抗热震性 

分 类 号：TQ175[化学工程—硅酸盐工业]