镁铬砖显微结构的均化  

Microstructural homogeneity of magnesia-chrome brick

作　　者：高振昕[1] 黄振武[1] 卫晓辉[1] 任钢伟[1] 常亮[1] 

机构地区：[1]中钢集团洛阳耐火材料研究院,洛阳471039

出　　处：《耐火材料》2005年第3期211-214,共4页Refractories

摘　　要：利用OM、SEM、EDAX和XRD检测方法研究了一种在隧道窑烧成带使用10年的再结合镁铬砖显微结构均化现象。原砖由电熔镁铬颗粒和铬矿颗粒组成,其显微结构是不均匀的。经过1600～1750℃长时间的相互作用,全部铬矿颗粒溶于方镁石基晶中,显微结构转变为均匀的“两相共生体”结构———含尖晶石脱溶相的方镁石固溶体。原砖中的氧化铬经蒸发而损失。Microstructural homogeneity of a rebonded magnesia-chrome brick used in tunnel kiln in a period of 10 years were studied by means of OM, SEM, EDAX and XRD. The original brick consists of fused magnesia-chromite grains and raw chromite grains and its microstructure is non-uniformity. Through the interaction among various grains in long time, at the temperature range of 1600-1750°C, all raw chromite grains solubilize into base-crystals of periclase and the microstructure of original brick converts into a homogeneous one of 2 phases in one crystal-periclase s. s. with precipitated spinel. The quantity of Cr2O3 in brick was lost by evaporation.

关 键 词：显微结构 镁铬砖 均化 微结构转变 检测方法 EDAX 颗粒组成 相互作用 方镁石 SEM 烧成带 隧道窑 XRD 电熔镁 不均匀 长时间 固溶体 脱溶相 尖晶石 共生体 氧化铬 铬矿 蒸发 

分 类 号：TQ172.622[化学工程—水泥工业] TQ172.612[化学工程—硅酸盐工业]