堇青石对莫来石-铝矾土浇注料性能的影响

Effect of Cordierite on Properties of Mullite-bauxite Castable Refractory

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24h脱模后,再经110℃烘干24h,分别于1000℃、1300℃和1500℃热处理3h。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.