作者：ZOU Yang,GU Huazhi,HUANG Ao,ZHANG Meijie

作者单位：The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology

刊名：China’s Refractories

ISSN：1004-4493

出版年：2017-12-15

卷：26

期：4

起页：17-23

止页：

分类号：TQ175.732

语种：英文

关键词：

内容简介

Corundum-spinel castables containing lightweight aggregates have drawn many attentions due to their potential for energy-saving,especially when applied in the high-temperature region,such as the work lining of refining ladle. One main aspect that restricts their application is the slag corrosion performance. In this study,one dense tabular corundum and three kinds of lightweight corundum were chosen as aggregates to prepare four different corundum-spinel castables. The slag resistance was compared through the induction furnace corrosion test. SEM-EDS,XRD,and thermodynamic and kinetics analysis were adopted for the discussion of the corrosion mechanism. Results show that the crystal grain size and shape of aggregates are important for the slag corrosion resistance of lightweight corundum-spinel castables under dynamic condition( enforced convection),yet the effects of pore characteristics are not dominated. Aggregates with large flake-like crystal grains show a thicker dissolution diffusion boundary layer and a lower dissolution rate,resulting in a favorable corrosion resistance of the castable. The poor microstructure of the aggregates,namely,larger pores and small and spherical grains,would cause deterioration of castables ’ slag resistance.