原位反应合成Al/AlN结合刚玉基耐火材料

In Situ Reaction Synthesis of Al-AlN Bonded Corundum Based Refractory

以刚玉和金属铝为原料,在氮气气氛下通过原位反应合成了Al/AlN结合刚玉基耐火材料。当金属铝含量为14%、氮化条件为1100℃,3h时,所合成材料有较好的物理性能。通过物相与显微结构分析,发现有大量呈晶须和颗粒状的AlN生成,并残存部分金属铝。这种复相结合系统赋予材料优异的力学性能。对材料应用性能研究发现,材料的水化趋势很小,具有很好的抗热冲击性能,而Al和AlN的氧化具有保护性氧化的特征。

The Al-AlN bonded corundum based refractory was synthesized by the in-situ reaction of fused alumina and metallic aluminum under nitrogen atmosphere. The composite material from 14% addition of metallic aluminum and 1100 ℃, 3 h of nitrogen treatment displayed excellent physical properties. The large quantity of AlN in the form of whiskers and fine powders was formed with significant quantity orAl left in the matrix. This multiple bonding system provided the excellent mechanical properties, good hydration resistance and excellent thermal shock resistance. The protective oxidation of the Al/AlN bonding system was characterized.