刚玉-尖晶石质浇注料烧成过程中的线膨胀行为

Behavior of Linear Expansion of Corundum-Spinel Castables in Sintering Process

以电熔刚玉，氧化镁，硅微粉以及铝酸盐水泥为原料，制备了庐10mm×50mm的试样．在750～1450℃的温度下测量了试样的线膨胀率，研究了电熔刚玉粒度、氧化镁、水泥及硅微粉加入量对刚玉-尖晶石质浇注料烧成过程中线膨胀率的影响．研究结果表明：电熔刚玉粒度、氧化镁、水泥及硅微粉加入量对刚玉-尖晶石质浇注料的线膨胀率影响显著，增加电熔刚玉粒度和硅微粉的加入量，试样的线膨胀率减小，有效地抑制了刚玉-尖晶石质浇注料在烧成过程中的线膨胀行为；增加氧化镁和水泥的加入量，试样的线膨胀率呈增加趋势．

The linear expansion rate was determined by the φ10 mm×50 mm samples formed by fused corundum, magnesia, silica micropowder and aluminate cement at 750 - 1 450℃. The effects of the grain size of fused corundum and amounts of magnesia, cement and silica micropowder as additives on the behavior of linear expansion of the corundum-spinel castables in sintering process were studied. The results showed that they affect obviously the behavior, i.e., increasing the grain size of fused corundum and amount of silica micropowder will inhibit the linear expansion rate, while increasing the amounts of magnesia and cement the linear expansion rate tends to increase.