富铝尖晶石-碳复合材料渣渗透及导电的逾渗模型  

Percolation model of electric conductivity and slag-penetration of alumina-rich spinel-carbon refractories

作　　者：罗星源[1] 孙加林[1] 洪彦若[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《耐火材料》2014年第4期245-248,共4页Refractories

基　　金：国家自然科学重点基金项目(50332010)

摘　　要：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.

关 键 词：逾渗模型 石墨-尖晶石 导电性 渣渗透 

分 类 号：TQ175[化学工程—硅酸盐工业]