MgO部分稳定氧化锆陶瓷的抗渣侵蚀性研究

Corrosion resistance of MgO partially-stabilized zirconia ceramic

分别以3.5%(质量分数,下同)MgO部分稳定或4%CaO部分稳定的ZrO2陶瓷材料为试样,以CaO-Fe2O3-SiO2系的3种不同碱度与Fe2O3含量的渣为侵蚀剂,对试样分别进行静态和动态旋转(试样与渣的相对速率分别为0.06和0.5 m.m in-1)侵蚀试验,研究渣的碱度、流速及Fe2O3含量对材料抗侵蚀性的影响。结果发现,MgO部分稳定ZrO2材料抗渣侵蚀性较好,试样在渣线部位较严重的侵蚀归因于Marangoni效应。试样侵蚀情况与渣的碱度、成分有密切关系,高碱度渣侵蚀的方式主要是形成新的化合物而降低试样强度,中碱度或低碱度高Fe2O3渣则先将稳定剂MgO溶出,使材料遭受侵蚀的同时还发生相变化。

Static and dynamic rotation tests（the relative speed were 0.06 and 0.5 m·min^-1,respectively） were carried out on two specimens—3.5wt% MgO partially-stabilized zirconia and 4wt%CaO partially-stabilized zirconia,adopting the slag from the CaO-Fe2O3-SiO2 system with three different basicities and Fe2O3 contents.The effects of slag basicity,flow velocity and Fe2O3 content on the corrosion resistance of the material were investigated.The results show that：the slag resistance of MgO partially-stabilized zirconia is better and the serious corrosion along the slag line is mainly attributed to the Marangoni effect.The corrosion has a close relationship with the composition and basicity of the slag.The high-basicity slag forms a compound which decreases the strength of the specimen.While the intermediate-basicity or low-basicity,high Fe2O3 slag preferentially leach out MgO,causing phase transformation during corrosion.