精炼钢包用Al_2O_3-MgO-CaO系复相耐火材料的研发  

Development of Al_2O_3-MgO-CaO refractories for refining ladle

作　　者：尹雪亮 陈敏[1] 王楠 徐磊 YIN Xue-liang CHEN Min WANG Nan XU Lei(School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China School of Metallurgy, Liaoning Institute of Science and Technology, Benxi 117000, Liaoning, China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819 [2]辽宁科技学院冶金学院,辽宁本溪117000

出　　处：《钢铁研究学报》2017年第10期781-786,共6页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(51174049;51374057;51374062;51574065;51574066);辽宁省教育厅资助项目(L2015275(1506181))

摘　　要：为适应精炼钢包用耐火材料轻量化的发展需要,采用两步烧结法向Al_2O_3-MgO-CaO系复相耐火材料中添加La_2O_3,并对该耐火材料的抗LF精炼渣侵蚀性能进行了研究。结果表明,添加的La_2O_3优先固溶入Al_2O_3-MgO-CaO系复相耐火材料的晶相CaO·6Al_2O_3中,促使CaO·6Al_2O_3晶胞产生晶格畸变,有效抑制了CaO·6Al_2O_3晶粒沿基面的异常长大,进而有效地促进了Al_2O_3-MgO-CaO系复相耐火材料的烧结致密化。当添加La_2O_3的质量分数为4%,在1600℃保温2h烧成后,试样的气孔率由占总体积分数的19.2%下降至6.1%,体积密度由2.78g/cm3上升至3.18g/cm3,制得了含MgO·Al_2O_3、CaO·2Al_2O_3、CaO·6Al_2O_3晶相且呈现交织分布、显微结构致密的Al_2O_3-MgO-CaO系复相耐火材料,其抗LF精炼渣侵蚀性能与同等致密度的Al_2O_3-MgO质耐火材料相当。In order to adapt the demands of refining ladle with the lightweight refractories,La2O3-doped Al2O3-MgO-CaO refractories were prepared by two-stage sintering method,and corrosion resistance of Al2O3-MgO-CaO refractories to LF refining slag was discussed.The results show that La2O3 preferentially dissolves to CaO·6Al2O3phases in Al2O3-MgO-CaO refractory with complex phases,causing the lattice distortion of CaO·6Al2O3crystal cells.Then the abnormal grain growth of CaO·6Al2O3is controlled,and the densification of Al2O3-MgO-CaO refractories is effectively promoted.As a result,the apparent porosity decreases from 19.2vol%to 6.1vol% and the bulk density increases from 2.78g/cm3 to 3.18g/cm3 after heating at 1600℃for 2hby addition of 4mass% La2O3,then a kind of Al2O3-MgO-CaO refractory,which is comprised of MgO·Al2O3,CaO·2Al2O3and CaO·6Al2O3 phases,with crystal intertwined distribution and dense microstructures is produced.Corrosion resistance of La2O3-doped Al2O3-MgO-CaO refractories to the LF refining slag is similar to that of Al2O3-MgO refractories with the same density.

关 键 词：Al2O3-MgO-CaO 耐火材料 烧结 抗渣侵蚀性 

分 类 号：TF769.2[冶金工程—钢铁冶金]