【摘要】 分别以93%或96%的电熔镁砂(3~1mm,≤1mm,≤0.088mm)、4%的碳化硅粉(≤0.088mm)、3%或0的金属铝粉(≤0.088mm)为主要原料,配成含铝粉和不含铝粉的MgO-SiC试样,以热固性酚醛树脂为结合剂,在等静压压力机上以200MPa的压力压制成坩埚,自然养护24h后于230℃保温24h,然后在坩埚中加入5kg超低碳钢,并在钢样表面覆盖120g无碳保护渣,放入感应炉中加热至1600℃至钢水熔化,每隔30min取1份钢样,共取6份,化验钢样中的碳含量,并对试验后试样与钢水的反应层进行显微镜观察和EDAS分析。结果表明:SiC氧化形成的SiO2保护膜以及MgO-CaO-SiO2液相的形成,有利于降低SiC对钢水的增碳作用;金属铝粉的加入减少了SiC的氧化,并且可能对钢水产生脱氧作用,导致SiC向钢中增碳。更多还原

【Abstract】 Al-bearing or Al-free MgO-SiC specimens were prepared by using 93% or 96% fused magnesia（3¹ mm,≤1 mm,≤0.088 mm）,4% silicon carbide （≤0.088 mm）,3% or 0 Al powder （≤0.088 mm） were used as starting materials and thermosetting phenolic resin as binder.The specimens were pressed under 200 MPa pressure,cured for 24 h and heated at 230 ℃ for 24 h.Then 5 kg ultra-low carbon steel was added into the crucible and the steel surface was covered by 120 g carbon-free mould flux.Then the crucible was heated to 1600 ℃ in a reduction furnace until the steel was molten.The molten steel was taken out every 30 min totally 6 times and the carbon content in the steel was determined.The reaction layers between the specimen and molten steel were analyzed by SEM and EDAS.The result shows that the formation of SiO₂ film from SiC oxidation and MgO-CaO-SiO₂ liquid phase help reduce the carburization of SiC to the molten steel;Al powder decreases the SiC oxidation and likely accelerates deoxidization in the steel,resulting in carburization of SiC to the steel.更多还原