尖晶石组成对刚玉-尖晶石浇注料显微结构的影响  

Effect of spinel composition on microstructure of corundum-spinel castables

作　　者：范鹏骁 张三华[1] 李志刚[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》2016年第1期45-47,50,共4页Refractories

摘　　要：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Mg O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1 500℃保温5 h和1 650℃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。Three groups of corundum-spinel castables with 1. 4 mass% Mg O 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 together; the spinels combine with CA6 through corundum by various styles; exsolution and precipitation of corundum 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.

关 键 词：刚玉-尖晶石浇注料 尖晶石组成 固溶 脱溶 

分 类 号：TQ175[化学工程—硅酸盐工业]