MgO-C castables with about 5 mass% (similarly hereinafter) carbon were prepared using fused magnesia and four graphite carbon sources including graphite pellets (PG) with about 35% carbon made from fused magnesia and flake graphite, coke graphite (CG) with 98.34% carbon, electrode graphite (EG) with 99.08% carbon and waste magnesia carbon bricks (MC). Influences of different graphite carbon sources on physical properties,oxidation resistance and slag resistance of the castables were studied. The results show that adding a proper amount of graphite carbon can significantly improve slag penetration resistance of magnesia based castables;the castables containing PG,CG and EG have lower apparent porosity,higher strength and better oxidation resistance than the castables containing MC;PG and MC containing flake graphite are more helpful to slag resistance of the castables than CG and EG with low graphitization degree,meanwhile,the uniform distribution of graphite in the form of small flake is very beneficial to slag resistance.%分别以电熔镁砂和4种石墨碳源——用电熔镁砂和鳞片石墨制成的w(C)≈35％的造粒石墨(PG)、w(C) =98.34％的焦炭石墨(CG)、w(C) =99.08％的电极石墨(EG)、废镁碳砖(MC)为原料,制备了碳含量均为5％(w)左右的MgO-C浇注料,研究了不同石墨碳源对浇注料物理性能、抗氧化性能和抗渣性能的影响.结果表明:加入适量石墨碳源可以显著提高镁质浇注料的抗渣渗透性;含PG、CG和EG的MgO-C浇注料比含MC的显气孔率低,强度更高,抗氧化性更好;与石墨化程度较低的CG、EG相比,含鳞片石墨的PG、MC更有利于MgO-C浇注料抗渣性能的提高,并且石墨以细小鳞片状的形式在基质中均匀分布对抗渣性非常有利.
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