在以93%(w)镁砂、3%(w)铝粉、4%(w)石墨、外加4%(w)酚醛树脂为基础配方的低碳镁碳砖组成中,采用CaAl4O7-MgAl2O4复合材料为添加剂等量取代镁砂,研究其加入量(其质量分数分别为2%、4%、6%、8%)对低碳镁碳砖抗热震性的影响.结果表明:随着添加剂加入量的增大,低碳镁碳砖的热膨胀系数、弹性模量(E)及高温抗折强度(Re)基本上均呈下降趋势,而抗热震性Re/E指数增大.因此,添加CaAl4O7-MgAl2O4有利于提高低碳镁碳砖抗热震性;但添加过量时,对抗热震性不利,以添加6%(w)为宜.
参考文献
[1] | Jonas S;Nadachowski;Szwagierczak D.The behavior of calcium dialuminate-based refractory compositions on heating[A].Florence,Italy,2002:243-247. |
[2] | Jonas S;Nadachowski;Szwagierczak D.Thermal expansion of CaAl2O4-based refractory compositions containing MgO and CaO additions[J].Journal of the European Ceramic Society,2006(26):2273-2278. |
[3] | Teffin C .The reaction of metal additives in MgO-C and Al2O3-C refractories[J].interceram,1994,43(06):454-460. |
[4] | 秦福平.低碳MgO-C砖的开发[J].国外耐火材料,2002(05):56-57. |
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