尖晶石组成对刚玉－尖晶石浇注料显微结构的影响

摘要

Three groups of corundum-spinel castables with 1.4 mass% MgO and different grades of spinels were designed using tabular corundum,calcium aluminate cement,reactive alumina and fused spinel fines (AM70,AM85,AM90)as main materials.After heat treatment at 1 500 ℃ for 5 h and 1 650 ℃ for 5 h,effect of spinel grade on microstructure of corundum-spinel castables was investigated.The results show that:during heat treatment,AM70 spinels solid solve the surrounding corundum phases,combining them togeth-er;the spinels combine with CA6 through corundum by various styles;exsolution and precipitation of corun-dum phase occur in AM85 or AM90 spinels,and corundum reacts with the surrounding cement forming CA6 on the edges of spinels particles,and then forming spinel-CA6 combination,the spinels and corundum in the castables are combined by CA6 .%以板状刚玉、铝酸钙水泥、氧化铝微粉和电熔尖晶石细粉（AM70、AM85、AM90）为主要原料，设计了三组 MgO 含量均为1．4％（w）、含不同组成尖晶石的刚玉－尖晶石浇注料，分别经1500℃保温5 h 和1650℃保温5 h 热处理后，研究了尖晶石组成对刚玉－尖晶石浇注料显微结构的影响。结果表明：在热处理过程中，AM70尖晶石与其周围刚玉相发生固溶反应，使尖晶石和刚玉烧结在一起，浇注料中尖晶石、CA6相通过刚玉相以多种结合方式联结；AM85和 AM90尖晶石发生脱溶析出刚玉相，刚玉相再与周围水泥在尖晶石颗粒边缘反应生成 CA6，形成尖晶石－CA6结合，浇注料中尖晶石和刚玉通过 CA6联结。