材料期刊网

本文汇集1957年以来某些电炉炉顶使用后高铝砖的显微镜观察工作,砖体主要受MgO,CaO和铁氧化物侵蚀.MgO来源于补炉镁砂和镁质炉墙在高温下的冲蚀和挥发,X射线和显微镜分析证实渣蚀带一些区域内存在粒状和针状方镁石晶体.存在铁氧化物时,基本上吸附在渣蚀带表面,形成有两个尖晶石固溶体〔(MF’)A和(F’M)F〕系列的矿物共生组合,当不存在铁氧化物时,在渣蚀带生成纯MA.其它平衡相有钙镁橄榄石和钙长石.在渣蚀带内层,反应产物为六铝酸钙和钙铝黄长石.

An aspect is summarized of microscopic studies on certain slagged high-alumina bricks dismantled after arc furnace roof service with various steel smelt-ing operations in the past years since 1957. The bricks were attacked mainly byMgO, CaO and iron oxides. The MgO had its sources by evaporation and infiltra-tion from either magnesite fettling material or basic furnace wall under highertemperatures. It was identified by X-ray powder pattern and by microscopic ob-servation that the periclase grains or/and needles occur in the slagged zone ofbricks. The iron oxides, if presence, accumulated themself mostly on the surfacelayer of slagged zone, formed an assemblage of reaction products and convertedinto two systems of ferro-spinels as (MF')A and (F'M)F. However, only MAspinel was formed with less iron oxides content. Other equilibrium phases contain-ing CaO may be monticellite and anorthite. The reaction products observed seemto be calcium- hexaluminate and gehlenite in the inner layer of slagged zone,and a certain amount of glass is also present.