关键词: 复相刚玉-尖晶石, 复相烧结刚玉, 钢包工作衬, 侵蚀机制, 显微结构

Abstract: To further optimize the explosive spalling resistance and thermal shock resistance of corundum-spinel castables,a composite corundum-spinel castable was prepared using white fused corundum,composite sintered corundum,reactive alumina micropowder,90# alumina-rich spinel micropowder,70# spinel fine powder,and calcium aluminate cement as raw materials.A conventional corundum-spinel castable was also prepared for reference.The composition and microstructure of the spent fast-baking and explosive-spalling-resistant composite corundum-spinel castable were analyzed.The results show that during service,its degradation is mainly caused by the reactions with slag and molten steel,and the damage modes are predominantly slag corrosion,penetration,and structural spalling.By adjusting the matrix composition and microstructure and introducing composite sintered corundum,the strength of the cured castable was significantly improved,and its explosive spalling resistance and thermal shock resistance were enhanced.When applied in a domestic 300 t refining ladle,under relatively low ambient curing temperature conditions,it can meet the demands of short curing time and fast heating.Compared with the conventional corundum-spinel castable,its service life was increased by 60%.

Key words: composite corundum-spinel, composite sintered corundum, ladle working lining, corrosion mechanism, microstructure