采用碳含量为6％的低碳MgO-C耐火材料和CaO/SiO2为0.8的渣,分别在中频感应炉和电阻炉中进行渣蚀实验.对在不同环境下渣蚀后的试样进行X射线衍射( x-ray diffraction,XRD)、扫描电子显微镜(scanning electron microscope,SEM)和EDAX分析.结果表明,感应炉环境中存在电磁场,其渣蚀试样渗透层中高温相结构紧密,在界面处形成镁铁固溶体( Mg1-x FexO)和镁锰固溶体(Mg1x MnxO),低熔相主要为含少量铁锰氧化物的钙镁橄榄石[Ca Mg( Fe、Mn)SiO4].电阻炉中无电磁场,渣蚀试样界面没有固溶体形成,低熔相主要为硅酸钙(CaSiOa)、镁蔷薇辉石(Ca3MgSi2O8)和钙镁橄榄石(CaMgSiO4).在高温下,电磁场的存在提高了Fe2+/3+,Mn2的扩散系数,以及与镁砂中Mg2的置换能力,有助于形成镁铁固溶体和镁锰固溶体.无论有无电磁场作用,渗透层都有镁铝尖晶石( MgAl2O4)生成.电磁场环境加剧了熔渣对MgO-C耐火材料的侵蚀.
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