Abstract:

In order to further improve the strength and thermal shock resistance of Al₂O₃-C materials for steel ladle slide gates,the effects of four kinds of alumina micropowder (unimodal active alumina micropowder 07RAL,unimodal active alumina micropowder 15RA,bimodal active alumina micropowder 22RABL,and calcined alumina micropowder 40CA) on the density,the strength and the thermal shock resistance of Al₂O₃-C materials were studied.The results show that the density,the strength and the thermal shock resistance of Al₂O₃-C materials can be improved with the introduction of active alumina micropowders.Among them,the specimen with bimodal active alumina micropowder shows the best comprehensive performance,especially the hot modulus of rupture.Its actual application results in steel mills show that the average service life of the Al₂O₃-C slide plate prolongs,and the problems of casting hole expansion,the oxidizing and brushing of the plate surface,and cracking are obviously improved.

Key words: alumina micropowder, continuous casting, steel ladle, slide gate, alumina carbon materials

摘要：

为了进一步提高钢包滑板用Al₂O₃-C材料的强度和抗热震性能,研究了单峰活性氧化铝微粉07RAL、单峰活性氧化铝微粉15RA、双峰活性氧化铝微粉22RABL和煅烧氧化铝微粉40CA等四种氧化铝微粉对 Al₂O₃-C 材料的致密度、强度和抗热震性能的影响。结果表明:在Al₂O₃-C材料中引入活性氧化铝微粉,可提高材料的致密度、强度和抗热震性能。其中,引入双峰活性氧化铝微粉的试样的综合性能最佳,尤其是高温抗折强度最高。在钢厂的实际使用结果表明,引入双峰活性氧化铝微粉生产的Al₂O₃-C滑板,其平均使用寿命提高,铸孔扩孔、板面氧化拉毛、开裂等问题也得到明显改善。

关键词: 氧化铝微粉, 连铸, 钢包, 滑板, 铝碳材料