不同铁载体对镁铁铝尖晶石材料性能影响  

Effect of Different Iron Supports on Properties of Magnesia-Hercynite Materials

作　　者：丁达飞 李志坚[1] 栾旭[1] 吴锋[1] 

机构地区：[1]辽宁科技大学高温材料与镁资源工程学院,鞍山114051

出　　处：《硅酸盐通报》2014年第12期3108-3112,共5页Bulletin of the Chinese Ceramic Society

基　　金：国家科技支撑计划资助项目(2013BAF09B01)

摘　　要：分别以烧结铁铝尖晶石、电熔铁铝尖晶石、烧结镁铁砂及电熔镁铁砂为铁的载体,在控制试样化学组成接近前提下,按照镁铁铝尖晶石砖生产工艺制备镁铁铝尖晶石砖试样。检测试样的理化性能并采用XRD和SEM对试样的相组成和显微组织结构进行表征。结果表明:以两种镁铁砂为铁载体的试样体积密度高、显气孔率低、常温耐压强度大及热膨胀率小;以电熔铁铝尖晶石、电熔镁铁砂为铁载体的试样具有较高的荷重软化温度。以铁铝尖晶石为铁载体试样中,形成(Mg,Fe)Al2O4相,铁以Fe2+形式存在;以镁铁砂为铁载体试样中,形成Mg(Fe,Al)2O4相,铁以Fe3+形式存在;以烧结铁铝尖晶石、烧结镁铁砂为铁载体的试样显微结构中存在较多微气孔,以电熔铁铝尖晶石、电熔镁铁砂为铁载体的试样显微结构较为致密。Controlling the similar chemical compositions, magnesia-hercynite samples were prepared through the production process of magnesia-hercynite brick,using sintering hercynite,fused-hercynite,sintering magnesia-iron clinker and fused magnesia-iron clinker as iron supports,respectively. Physical and chemical properties of samples were measured. The phase composition and microstructure of samples were studied by XRD and SEM respectively. The result shows that samples with added magnesia-iron clinker have higher bulk density,lower apparent porosity,higher cold compressive strength and lower thermal expansion. And the samples with added fused-hercynite and fused magnesia-iron clinker respectively have higher refractoriness under load. The samples with added hercynite generate（ Mg,Fe）Al2O4compound with iron existed in the form of Fe2 ＋. The samples with added magnesia-iron clinker generate Mg（ Fe,Al）2O4compound with iron existed in the form of Fe3 ＋. Lots of micropores are existed in the microstructure of samples with added sintering hercynite and sintering magnesia-iron clinker respectively. And the samples with added fused hercynite and fused magnesia-iron clinker respectively possess compact microstructure.

关 键 词：镁铁铝尖晶石砖 铁载体 物相组成 理化性能 

分 类 号：TQ175[化学工程—硅酸盐工业]