为了提高MgO－CaO砖在AOD炉中的使用寿命，以w（CaO）＝20％的镁钙砂颗粒（粒度8～5、5～2、≤2 mm）和细粉（≤0．074 mm）为主要原料，石蜡为结合剂，添加 w （CaTiO3）＝93％的钛酸钙细粉（≤0．074 mm，质量分数分别为0、2％、4％、6％、8％、10％、12％和14％），在液压机上以450 MPa 压力压制成φ50 mm ×55 mm的圆柱试样，在高温试验电炉中于1500℃保温2 h烧成后，检测试样的显气孔率、体积密度、烧后线变化率、抗热震性能和抗渣性能。结果表明：随着钛酸钙细粉加入量的增加，试样的致密度、烧后线收缩率、常温耐压强度和抗热震性能等基本上都呈先增大后减小的变化趋势，拐点均在钛酸钙细粉加入量为8％（w）处；抗渣性能以钛酸钙加入质量分数为6％、8％的试样为最好。
In order to prolong the service life of MgO-CaO bricks for AOD furnace,the columnar specimens (φ50 mm ×55 mm)were prepared using magnesia-calcium oxide sand and fine (CaO 20 mass%,8-5, 5 -2,2-0,≤0.074 mm)as the main raw materials,paraffin as the binder,adding calcium titanate fines (CaTiO3 93 mass%,≤0.074 mm)with different additions (0,2%,4%,6%,8%,10%,12%,14%,by mass),mixing,pressing in a hydraulic press under 450 MPa,and then firing at 1 500 ℃for 2 h.The appar-ent porosity,bulk density,linear change on heating,thermal shock resistance and slag resistance were re-searched.The results show that with calcium titanate fine addition increasing,the density,linear shrinkage rate,cold crushing strength and thermal shock resistance firstly increase and then decrease,and the inflec-tion point is at 8% calcium titanate fine;the specimens perform the best slag resistance when adding 6%and 8% calcium titanate.
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