Enhanced slag resistance and mechanical properties of magnesia castables with strontium carbonate addition  

作　　者：Hao Liu Yu-xuan Zhu Zhou-fu Wang Yan Ma Xi-tang Wang 

机构地区：[1]The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China

出　　处：《Journal of Iron and Steel Research International》2023年第10期2021-2030,共10页

基　　金：The authors would like to express their gratitude for the financial support from the National Natural Science Foundation of China(U20A20239);the Key Research and Development Project of Hubei Province,China(2022BAA032).

摘　　要：Magnesia castables have been widely used in metallurgical industries with the advantages of high refractoriness,non-polluting steel,and resistance to alkaline slag.Magnesia castables were prepared using strontium carbonate(SrCO_(3))as additive to enhance slag resistance and mechanical properties,and the influence of SrCO_(3) on the evolution of phases,microstructure and properties of magnesia castables sintered at different temperatures was clarified.The results show that,with the introduction of SrCO_(3)(lower than 3 wt.%),elastic modulus,mechanical strength,thermal shock resistance and densification of magnesia castables were significantly enhanced owing to the formation of needle-like Ca_(0.9)Sr_(0.1)MgSi_(2)O_(6) phase and liquid phase when sintering at high temperatures,and the introduced SrCO_(3) presented minor effects on the mechanical properties of castables for its highly structural stability below 1100℃.During the slag corrosion process,SrCO_(3) and SiO_(2) in castables reacted with Al^(3+)in molten slag to form SrAl_(2)SiO_(8) phase,resulting in the increased slag viscosity and suppressed continuing penetration.

关 键 词：Magnesia castable SrCO_(3) MICROSTRUCTURE Slag resistance Mechanical property 

分 类 号：TG14[一般工业技术—材料科学与工程]