(东北大学 材料与冶金学院, 沈阳 110004)
摘 要: 采用静态熔滴法, 模拟高炉软熔带渣成分,研究了原位TiN/O′-Sialon复相材料的抗渣侵蚀性能并与其他材料进行了对比。 采用X射线衍射仪分析残渣的物相, 对材料被侵蚀部位采用电子探针方法进行显微结构观察和元素分布分析,测量蚀损层的平均深度。 结果表明: 材料被侵蚀后结构发生变化, 可大致分为渣带、 渗透带和未变带; 随材料中TiN含量的增加, 材料的蚀损深度减小, 渣带和渗透带变窄, 抗渣侵蚀性能增强; TiN/O′-Sialon的抗渣侵蚀性能优于O′-Sialon和ZrO2/O′-Sialon; 随侵蚀温度升高、 侵蚀时间延长和渣中FeO含量增大, 材料的蚀损深度增加, 其中侵蚀温度的影响最为显著。
关键字: 原位TiN/O′-Sialon材料; 高炉软熔带渣; 抗渣侵蚀性能; 蚀损深度
( School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China)
Abstract: Corrosion resistance to slag of in-situ TiN/O′-Sialon was investigated by means of static droplet method and was compared with that of other materials, under simulating conditions of BF cohesive zone slag. Phase composition of the residue slag was analyzed by X-ray diffraction. For corroded region of materials, microstructure, element distribution and corrosion depth were observed and determined by electro-probe microanalysis. The results show that after being corroded, the structure of TiN/O′-Sialon material is composed of slag zone, penetrated zone and unchanged zone. With the increasing TiN content in the material, corrosion depth decreases and both slag zone and penetrated zone narrow down, which implies an improved corrosion resistance to slag. TiN/O′-Sialon shows a more excellent corrosion resistance to slag compared with O′-Sialon and ZrO2/O′-Sialon. Corrosion depth i.e., corrosion extent of TiN/O′-Sialon increases with increasing corroding temperature, holding time and FeO content in slag. Among the three factors, corroding temperature exhibits more dramatic effect.
Key words: in-situ TiN/O′-Sialon; blast furnace cohesive zone slag; corrosion resistance to slag; corrosion depth