【摘要】 以特级焦宝石颗粒、轻质莫来石骨料、特级矾土细粉、活性α-Al2O3微粉、石英细粉等为主要原料,分别用6%质量分数的电熔镁砂细粉、Secar75水泥、ρ-Al2O3与5%质量分数的SiO2微粉组成结合体系,配制成3种不同结合体系的高速连铸中间包永久衬浇注料,并对比研究了3种结合体系对浇注料物理性能和抗热震性的影响。结果表明:电熔镁砂细粉+SiO2微粉结合的浇注料试样在各温度下(110、800、1 100和1 400℃)热处理后的常温强度、1 200℃热态抗折强度、1 100℃水冷热震1次后强度保持率均优于以Secar75水泥+SiO2微粉和ρ-Al2O3+SiO2微粉为结合剂的试样的,但其1 400℃热态抗折强度低于后两者的。更多还原

【Abstract】 Castables with three different bonding systems for tundish permanent lining of high speed continuous casting were prepared with special grade flint clay particles,light-weight mullite aggregates,special grade bauxite powder,active α-Al2O3 micropowder,and quartz powder as starting materials.The bonding systems were 6% fused magnesia powder and 5% SiO2 fume,6% Secar 75 cement and 5% SiO2 fume,and 6% ρ-Al2O3 and 5% SiO2 fume,respectively.Effects of bonding systems on physical properties and thermal shock performance of castables were investigated.The results indicate that the specimen with fused magnesia powder and SiO2 fume as binder exhibites higher cold strength after heat treatment at 110,800,1 100 and 1 400 ℃,higher hot modulus of rupture at 1 200 ℃,larger ratio of residual strength after one thermal shock(1 100 ℃,water quenching) and lower hot modulus of rupture at 1 400 ℃ than specimens using Secar 75 cement and SiO2 fume or ρ-Al2O3 and SiO2 fume as binder.更多还原