含铝粉的MgO-SiC材料对IF钢硅含量的影响

Influence of MgO-SiC material with Al powder on silicon content of IF steel

以电熔镁砂、碳化硅和铝粉为主要原料,采用热固性酚醛树脂为结合剂,以等静压(200 MPa)压制成坩埚,自然养生24 h后于230℃保温24 h热处理。随后在坩埚中加入5 kg的IF钢和120 g保护渣,然后放入感应炉中加热至1 600℃至钢水熔化,分别冶炼30 min、60 min、90 min、120 min和180 min后各取1份钢样,化验钢样中的硅含量,并对试验后试样与钢水的反应层进行XRD、SEM和EDAS分析。结果表明:耐火材料和钢液反应层中MgO-CaO-SiO2液相的形成有利于降低材料中SiC对钢水的增Si作用,而铝粉的加入会促进MgO-SiC材料中的SiC向钢中溶解。

Fused magnesite,silicon carbide and AI powder are used as the starting materials,and hot setting phenolic resin as binder. The mix of the starting materials was pressed into a crucible with isostatic pressing machine. After air curing for 24 h,heating at 230 ℃ for 24 h,the crucible was filled with .5 kg IF steel and 120 g mould flux, before firing up to 1 600 ℃ in induction furnace until the steel melting, and holding for 30 rain, 60 min,90 min,120 min,180 min,respectively. At each stage one molten steel sample was taken out to examine the silicon content. The reaction layer of the tested crucible and molten steel was analyzed by XRD and electron probe microanalysis with energy disperse spectroscopy （EDAS）. The result shows that：The formation of MgO-CaO-SiO2 liquid phase in reaction layer is in favor of reducing the silicon pickup of steel from MgO -SiC composites, but adding AI powder will accelerate the dissolution of SiC from MgO - SiC composites into steel.