Improved slag corrosion resistance of MgO-C refractories with calcium magnesium aluminate aggregate and silicon carbide: Corrosion behavior and thermodynamic simulation

被引:14
作者
Guo, Weijie [1 ,2 ]
Zhu, Tianbin [1 ,2 ]
Zhao, Xu [1 ,2 ]
Li, Yawei [1 ,2 ]
Chen, Qilong [3 ]
Xu, Xiaofeng [1 ,2 ]
Xu, Yibiao [1 ,2 ]
Dai, Yajie [1 ,2 ]
Yan, Wen [1 ,2 ]
机构
[1] Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, Wuhan 430081, Peoples R China
[2] Wuhan Univ Sci & Technol, Natl Prov Joint Engn Res Ctr High Temp Mat & Linin, Wuhan 430081, Peoples R China
[3] Puyang Refractories Grp Co Ltd, Puyang 457100, Peoples R China
基金
中国国家自然科学基金;
关键词
Slag corrosion resistance; CMA aggregate; MgO-C refractories; Thermodynamic calculation; THERMAL-SHOCK RESISTANCE; FRACTURE-BEHAVIOR; LADLE SLAG; GRAPHITE; BRICKS; COMPOSITE; STEELMAKING; MECHANISM; PHASE; SCRAP;
D O I
10.1016/j.jeurceramsoc.2023.08.033
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The influence of calcium magnesium aluminate (CMA) aggregate and silicon carbide on the slag corrosion resistance of MgO-C refractories was investigated by the induction furnace tests. The corrosion behavior and the formation of protective slag layer were also comprehensively discussed in present work. The results showed that CaAl2O4 in CMA converted into Al-containing liquid phase when facing the slag, while spinel with better slag corrosion resistance diffused into the refractory-slag interface. The Al-containing liquid phase melted from CaAl2O4 mixed with slag and increased the Al content, increasing the proportion of indirect dissolution, forming more spinel and decreasing the corrosion rate. Furthermore, the spinel and liquid slag formed solid-liquid mixture at the interface, increasing the viscosity and promoting the formation of protective slag layer, which avoided direct contact between slag and refractory. The combined use of CMA aggregate and silicon carbide showed better slag corrosion resistance because silicon carbide increased the oxidation resistance and inhibited the decarburized layer, while the FeSi alloy and higher viscosity also enhanced the slag corrosion resistance of such refractories.
引用
收藏
页码:496 / 509
页数:14
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