摘要
金属Al/Si复合低碳MgO-C砖在冶炼品种钢的210 t钢包渣线试用,取得良好使用效果。采用XRD、SEM、EDS对用后残砖分段带进行了物相和显微结构分析,结果表明:用后残砖可分为原砖带、原砖渐变带和氧化带三个段带;原砖渐变带里Al和Si与C和N2反应,原位生成Al4C3、AlN和SiC,有利于提高高温强度和热震稳定性;氧化带里的AlN和SiC先后逐渐被氧化,并与MgO反应生成镁铝尖晶石和镁橄榄石,结构比较疏松,抗热震稳定性有所减弱。可以认为该砖的损毁原因主要是氧化后的结构剥落。今后改进的方向主要为改善材料氧化后的热震稳定性。
Low carbon MgO-C brick containing Al/Si was trial used in 210 t steel ladle for refining quality steel and satisfactory service results were obtained.Phase composition and microstructure of the brick after use were analysed by means of XRD,SEM and EDS.The results show that the structure of the brick after use can be divided into original zone,in-situ transformed zone and oxidized zone.In the in-situ transformed zone,Al and Si react with C and N2 to form in-situ Al4C3,AlN and SiC,which leads to increase in hot strength and thermal shock resistance.In the oxidized zone,AlN and SiC are gradually oxidized,and react with MgO to form spinel and forsterite,resulting in weakening of structure and lowering of thermal shock resistance.It is inferred that the erosion of this low carbon brick is mainly due to spalling after oxidation.In order to further improve the performance of the brick,the increase of thermal shock resistance after oxidation is of key importance.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2011年第5期37-40,共4页
Transactions of Materials and Heat Treatment
关键词
金属复合
低碳MGO-C砖
钢包渣线
氧化
剥落
containing metal
low carbon MgO-C brick
steel ladle slag line
oxidation
spalling
