α-Al_2O_3微粉对低碳MgO-C材料性能的影响  

Effect of α-Al_2O_3 Micro-powder on Properties of Low Carbon MgO-C Refractories

作　　者：谢朝晖[1] 叶方保[1] 

机构地区：[1]郑州大学高温陶瓷研究所,郑州450052

出　　处：《硅酸盐通报》2009年第6期1249-1253,共5页Bulletin of the Chinese Ceramic Society

基　　金：河南省杰出人才创新基金资助项目(0621001400)

摘　　要：以电熔镁砂及鳞片石墨为主要原料,热塑性酚醛树脂为结合剂,研究了α-Al2O3微粉对低碳MgO-C材料性能的影响。结果表明:(1)Al2O3微粉的加入提高了低碳MgO-C材料的体积密度,降低了显气孔率,提高了强度,显著改善了MgO-C砖的抗氧化性;(2)高温下Al2O3微粉与MgO原位反应生成连续的尖晶石相,改善了材料基质的显微结构,增强了陶瓷结合,将MgO颗粒与鳞片石墨紧密地结合起来,提高了组织结构的整体性,从而提高了材料的致密度和强度;(3)高温下原位反应生成连续的尖晶石相堵塞脱碳层中的部分气孔,降低了氧的扩散速度,同时提高了MgO的沉积速度,使加入Al2O3微粉的低碳MgO-C材料抗氧化性能得以提高。Effects of α-Al2O3 micro-powder on properties of low carbon MgO-C refractories were investigated with fused magnesia and flake graphite as starting materials,and Novolak phenolic resin as binder.The results show that：（1）with Al2O3 micro-powder addition,apparent porosity of MgO-C refractories decreases,both bulk density and MOR increase,and especially oxidation resistance improves noticeably.（2）The reaction of Al2O3 micro-powder in the matrix of MgO-C improves the textual integrity of MgO-C refractories and ceramic bonding,due to formation of an continuous in-situ spinel matrix.（3）The inward diffusion velocity of oxygen through the porous decarburized layer is slowed down by the formation of MgO dense layer and continuous in-situ spinel matrix,which results in the improvement of oxidation resistance.

关 键 词：AL2O3微粉 MGO-C砖 原位尖晶石 抗氧化性 

分 类 号：TQ175[化学工程—硅酸盐工业]