【摘要】 为了改善水系大面料的性能，提高转炉的使用寿命，以电熔镁砂和二氧化硅微粉等为主要原料制备了镁质水系大面料。研究了烧结助剂Fe₂O₃添加量（加入质量分数分别为0、1%、2%、3%）对大面料性能的影响并探明其在大面料体系中的作用机制。结果表明：1)在水系大面料中引入Fe₂O₃促进了MgFe₂O₄的形成，其与MgAl₂O₄结构相似，两者可形成Mg（Fe, Al）₂O₄连续固溶体，引起晶格畸变，加快反应中离子的扩散速率，促进试样烧结；2)Fe₂O₃的加入在试样中与SiO₂生成FeO-SiO₂系硅酸盐，其在1 500℃时呈液相，改善烧结过程，加强颗粒与基质间的结合，促进试样致密化；3)由于烧结性能提高，试样的常温物理性能得到改善，烧结时间缩短，但Fe₂O₃加入量过多，试样的线膨胀率较大，导致试样结构疏松，因此Fe₂O₃最佳的添加量为2%（w）。更多还原

【Abstract】 To improve the performance of water-based gunning mix for converter large area and prolong the service life of converters, magnesia water-based gunning mix was prepared with fused magnesia and silica fume as main raw materials.The effects of the sintering aid Fe₂O₃ additions（0,1%,2%,and 3%,by mass） on the properties of the gunning mix were studied, and its action mechanism in the gunning mix was explored.The results show that:（1）the introduction of Fe₂O₃ into the water-based gunning mix promotes the formation of MgFe₂O₄,which has a similar structure to MgAl₂O₄;and a continuous Mg（Fe, Al）₂O₄ solid solution forms between them, inducing lattice distortion, accelerating ion diffusion rate during the reaction, and promoting sample sintering;（2）Fe₂O₃ reacts with SiO₂ in the sample to form FeO-SiO₂,which is present as a liquid phase at 1 500 ℃,improving the sintering process, strengthening the bonding between particles and matrix, and promoting sample densification;（3）owing to the improved sintering performance, the cold physical properties of the samples are improved and the sintering time is shortened; however, excessive Fe₂O₃ leads to a large linear expansion rate of the sample, resulting in a loose structure.Therefore, the optimal addition of Fe₂O₃ is 2%.更多还原