添加剂对烧成MgO-MA质耐火材料性能的影响

Effects of additives on fired MgO-MA based refractory

以97电熔镁砂(粒度为5~3 mm、3~1 mm、1~0 mm)为骨料,97电熔镁砂(≤0.088 mm)和镁铝尖晶石(≤0.088 mm)为基质,在原配方基础上分别加入3种不同添加剂:活性α-Al2O3微粉(~2μm)、脱硅锆(~5μm)、钛白粉(~1μm)制备了4种MgO-MA试样,并经1700℃烧后对比了其强度、抗热震性和抗渣性能。结果表明:受材料气孔结构及结合相影响,添加钛白粉试样的强度最高、抗热震性及抗渣侵蚀性能最好,钛白粉对改善烧成MgO-MA质耐火材料性能最有利。

With 97 fused magnesia with the particle size of 5~3 mm,3~1 mm,1~0 mm as main raw materials,97 fused magnesia with the particle size of≤0.088 mm and MA spinel as matrix,four kinds of MgO-MA samples were prepared,the effects ofα-Al2O3 micro-powder(~2μm),zirconia(~5μm)and titania(~1μm)on the strength,thermal shock resistance and slag resistance of specimens fired at 1700℃were studied.The results show that the specimen with titania has the highest strength,the best thermal shock resistance and slag resistance because of the excellent pore structure and binders,the titania additive can effectively improve the properties of fired MgO-MA based refractory.