以莫来石、铝矾土为主要原料,铝酸钙水泥为结合系统,分别研究了不同堇青石含量经过不同热处理温度后对莫来石-铝矾土浇注料性能的影响.试样自然干燥24 h脱模后,再经110 ℃烘干24 h,分别于1000 ℃、1300 ℃和1500 ℃热处理3 h.检测各温度热处理后试样的线变化率(P.L.C)、体积密度(B.D)、抗折强度(M.O.R)、耐压强度(C.C.S)以及试样的热膨胀系数和抗热震性能.结果表明,莫来石-铝矾土浇注料的体积密度随着堇青石含量的增加而减小.经过1000 ℃和1300 ℃热处理后,莫来石-铝矾土浇注料的抗折强度随着堇青石含量的增加而下降.莫来石-铝矾土浇注料随着堇青石含量的增加,有助于改善材料的抗热震性,材料的强度保持率逐渐增大,且较低的体积密度有利于材料获得较高的热震后的强度保持率.
The effects of different cordierite contents on the properties of mullite-bauxite castable refractory were analyzed respectively by taking the mullite, bauxite as main raw materials and taking calcium aluminate cement as binding system. After 24 h curing in mould and another 24 h curing at 110 ℃ after demoulding, the specimens were heat treated at 1000 ℃,1300 ℃ and 1500 ℃for 3 h respectively. The permanent linear change, bulk density, modulus of rupture, clod crushing strength, thermal expansion coefficient and thermal shock resistance were examined. The results showed that bulk density of mullite-bauxite castable refractory is reduced with the increasing of cordierite content. The modulus of rupture is reduced with the increasing of cordierite content after 1000 ℃ and 1300 ℃; Thermal shock resistance of mullite-bauxite castable refractory is improved with the increasing of cordierite content, conservation rate of strength is increased gradually, and low bulk density contributes to high conservation rate of strength after thermal shocking.
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