热处理温度对焦宝石-铝矾土浇注料性能的影响

Effect of Heat Treatment Temperature on Properties of Calcined Flint Clay-Bauxite Castable Refractory

以焦宝石、铝矾土、蓝晶石和粘土为主要原料,铝酸钙水泥为结合系统,研究了不同热处理温度对焦宝石-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。结果表明,随着热处理温度的提高,焦宝石-铝矾土浇注料的体积密度减小;线变化率随着热处理温度的提高呈现收缩先增大后减小最终出现膨胀的变化规律。焦宝石-铝矾土浇注料的抗折强度和耐压强度随着热处理温度的提高而增大。焦宝石-铝矾土浇注料的热膨胀系数随着热处理温度的提高而减小。

Effect of different heat treatment temperature on properties of calcined flint clay--bauxite castable refractory was investigated with calcined, bauxite, kyanite and clay as raw materials, calcium aluminate cement as binders. After 24 h curing in mould and another 24 h curing at 110 ＂C after de- moulding, the specimens were heat treated at 1000 ~C, 1300~C and 1500 ＂Cfor 3 h respectively. The permanent linear change, bulk density, modulus of rupture, clod crushing strength and coefficient of thermal expansion was examined. The results show that with the increasing of heat treatment temperature, the bulk density of calcined flint clay--bauxite castable refractory decreases, the shrink in- crease first and then decrease, expand at last. The modulus of rupture and the cold crushing sifcngth of calcined flint clay--bauxite castable refractory increases with the increasing temperature. The coef- ficient of thermal expansion decrease with the increasing temperature.