为了探讨含碳耐火材料的导电性和渣渗透与组成的关系，采用w（C）＝98％的石墨、纯度为99％（w）的富铝尖晶石为主要原料，以石墨添加质量分数分别为5％、10％、15％、20％、40％、60％的富铝尖晶石-碳试样研究了其导电性与组成的关系，以石墨添加质量分数分别为10％、20％、30％、35％、40％、60％、80％、100％的试样研究了其抗渣性与组成的关系。结果表明，富铝尖晶石-石墨试样的导电性及渣渗透性与组成的关系都符合逾渗模型，其导电性的逾渗阈值为14．3％（石墨的体积分数），而抗渣性的逾渗阈值为56．4％（尖晶石＋孔隙的体积分数），且在逾渗阈值附近，材料的导电性对成型压力较为敏感。
Alumina-rich spinel-carbon specimens were prepared using graphite (C content is 98%,in mass,the same hereinafter)and alumina-rich spinel (the purity is 99%)as main starting materials to find the effects of composition on electric conductivity and slag-penetration of carbon containing refractories. The specimens with different graphite additions (5%,10%,15%,20%,40% and 60%)were used to ana-lyze relationship between electric conductivity and composition,and those with different graphite additions (10%,20%,30%,35%,40%,60%,80% and 100%)were used to analyze the relationship between slag-penetration and composition.It is found that two relationships can be described by percolation model;the percolation threshold of electric conductivity is 14.3%(volume fraction of graphite)and that of slag-pene-tration is 56.4% (volume fraction of spinel and pore),and the electric conductivity is sensible to shaping pressure when it nears the percolation threshold.
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