转炉ZrO_2滑板的蚀损机制

Corrosion mechanism of ZrO_2 sliding plates used in converters

为改进含Mg O的ZrO_2滑板的产品质量,提高其在转炉上的使用寿命,拍摄了放大10 000~100 000倍的显微结构照片,采用FESEM-EDS法探究了使用前后产品的显微结构和蚀损机制。结果显示:主晶相为条形编织结构的c-ZrO_2和粒状的m-ZrO_2晶体,晶间生成少量M2S等胶结相。使用后的滑板呈段带结构,在反应带发生ZrO_2的共析相变,并生成一系列反应产物,如CaZrO_3、FeO、尖晶石、硅酸盐等,滑板的损毀主要为炉渣的侵蚀。

The micrographs with magnification of 10 000 -100 000 of ZrO2 sliding plates containing MgO were taken,and the microstructure and corrosion mechanism were studied by FESEM-EDS in order to improve the quality and service life of ZrO2 sliding plates containing MgO for converters. The results show that the main phases are cubic ZrO2 with strip braided structure and granular monoclinic ZrO2;a small amount of intercrystalline M2S bonding phase generates. The used sliding plates have a zone structure. In the reaction zone,the eutectoid transformation of ZrO2 occurs and reaction products of CaZrO3, FeO, spinel and sili- cates form. The main damage of the sliding plate is caused by slag corrosion.