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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。
The metal Al / Si composite low-carbon MgO-C brick was tested on the 210 t ladle slag line of smelting variety steel, and achieved good results. The XRD, SEM and EDS were used to analyze the phase and microstructure of the brick after use. The results show that the brick can be divided into three stages: original brick, original brick and oxidation zone. In the original brick graded zone, Al and Si react with C and N2 to produce Al4C3, AlN and SiC in situ, which is beneficial to improve high temperature strength and thermal shock resistance. AlN and SiC in the oxidation zone are gradually oxidized and react with MgO Produce magnesium aluminum spinel and forsterite, the structure is relatively loose, thermal shock resistance has been weakened. It can be considered that the main reason for the damage of the brick is the flaking of the oxidized structure. The future direction of improvement is mainly to improve the thermal shock resistance of the material after oxidation.