低水泥刚玉浇注料的高温抗折强度研究

HMOR of low cement corundum based castable

采用板状刚玉、电熔白刚玉、工业氧化铬微粉、α-Al2O3微粉、Secar71水泥、烧结尖晶石粉为原料,研究了水泥、α-Al2O3微粉、氧化铬微粉、尖晶石粉以及烧成温度对低水泥刚玉基浇注料高温抗折强度的影响。研究结果表明:烧成温度、水泥、尖晶石和α-Al2O3微粉对低水泥刚玉基浇注料的高温抗折强度影响较大。烧后膨胀越大,高温抗折强度越低;1700℃烧后试样的高温抗折强度高于1600℃烧后试样的高温抗折强度;控制加热永久线变化率,添加合适的水泥、α-Al2O3微粉和粒度细的尖晶石粉可以得到高温抗折强度高的试样。

Tabular corundum, white fused corundum, industrial Cr2O3 micropowder, α-Al2O3 micropowder, Secar71 cement and sintered spinel powder were used as starting materials to prepare low cement corundum based castable. The influences of cement, α-Al2O3 micropowder, Cr2O3 micropowder, spinel powder and firing temperature on HMOR of low cement corundum based castable were discussed. The result shows the firing temperature,cement, spinel and α-Al2O3 micropowders have more influence on the HMOR. The higher the expansion after firing,the lower the HMOR. The HMOR of fired specimen at 1700 ℃ was higher than that of fired at 1600 ℃. Higher HMOR is expected by controlling linear change after firing,appropriate cement and α-Al2O3 micropowder addition,and finer spinel powder.