材料科学
腐蚀
冶金
微观结构
镁
熔渣(焊接)
氧化物
镁橄榄石
包层(金属加工)
剥落
矿物学
化学
作者
Guishi Cheng,Tengfei Zhao,Binbin Chen,Yihao Yang,Xiaoqiang Wang,Dong Chen,Ying Zhao
标识
DOI:10.1016/j.ceramint.2022.08.222
摘要
The adhesion of Na2CO3 slag to the surface of refractories in an alkali recovery furnace can cause corrosion and spall. Magnesia refractories can be used as linings in alkali recovery furnaces owing to their strong corrosion resistance to alkali slag. However, the permeability resistance of magnesia refractories is relatively poor. Hence, the interface and corrosion behaviours of slag cladding on magnesia refractories were studied using sessile drop and static crucible tests. The experimental results showed that an increase in the heating rate positively affected the cladding of the molten column on the refractory surface. The microstructure, element changes, and chemical composition changes of the corroded refractories were analysed using SEM-EDS and XRD. Thermodynamic simulation of the reaction between the slag and refractory was performed using Factsage 7.3. The results indicate that the generated forsterite filled the pores of the magnesia refractories. The microstructure of dense slag-refractory interface layer was formed, which prevented the infiltration of slag phases and alleviated the corrosion of refractories by the slag.
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