氧化铝陶瓷/一铝酸钙复合坩埚与钢液的作用研究

Study on the Interaction of Alumina/Monocalcium Aluminate Composite Crucible and Molten Steel

中频感应炉是高品质钢及合金材料冶炼的重要设备,其氧化铝陶瓷坩埚参与高温外场苛刻条件冶金过程,对感应炉的安全稳定运行和钢的质量有重要影响。本文采用高温热模拟试验,研究了一铝酸钙涂层对坩埚寿命及钢液洁净度的影响。研究表明:一铝酸钙(CA)在初期能有效阻隔钢液的渗透,其后与氧化铝陶瓷原位反应结合,同时吸收钢液中的氧化铝夹杂等,逐步形成六铝酸钙(CA6)高熔点隔离层,不仅减缓钢液的渗透侵蚀,而且可净化钢液,提升钢品质。

Medium frequency induction furnace is an important equipment in the process of smelting high quality steel and alloy material. Its alumina ceramic crucible is in high temperature and harsh conditions in the furnace, which not only served as a container, also was involved in metallurgical physical and chemical processes. The crucible has an important influence to the safe operation of the intermediate frequency induction furnace and quality of molten steel. The results show that： monocalcium aluminate（CA） coating formed high viscosity layer between the alumina ceramic and molten steel at high temperature, it can effectively prevent the penetration of molten steel at the beginning; after that, monocalcium aluminate（CA） coating chemically was combined with alumina ceramic by in situ reaction, meanwhile, the coating gradually transformed into calcium hexaluminate（CA6） isolation layer through absorbing aluminum oxide inclusions in the molten steel. It can not only reduce the penetration of molten steel, but also effectively purify molten steel and improve the quality of the steel.