Relation Between Sintering Reactivity of Matrix and Thermal Shock Resistance of Ultra-low Cement Bonded Corundum-spinel Castables for Fired Purging Plugs

作者：ZHANG Ju,LONG Bin,ZHOU Yunpeng,Andreas BUHR,WANG Feng,CUI Qingyang,XIE Guofeng,DING Dafei,JIA Quanli,YE Guotian

摘要：Purging plugs installed in the bottom of steel ladles are widely used for the secondary refining of high quality steel grades. The dynamic service conditions and temperature gradients caused by the cold inert gas blown through the plug during stirring create a strong thermal shock impact on the materials. This can affect its service life and restrict the safety and efficiency of steel making if the plug fails during use. In this work, the influence of the particle size distribution (PSD) and amount of reactive alumina on the sintering behavior of ultra-low cement bonded corundum-spinel based castables was investigated on lab scale. The relationship between sintering reactivity of matrix and thermal shock resistance of castables was evaluated in detail. Results show that the sintering of castables can be intensified by using finer reactive alumina. However, excessive sintering of the castable through finer reactive alumina is negative for thermal shock resistance. The microstructure characterization reveals that castables with more intense sintering show denser matrix structure,which is less effective in hampering crack propagation and therefore results in decline of their thermal shock resistance.

發文機構：Henan Key Laboratory of High Temperature Functional Ceramics Qingdao Almatis Co. Almatis GmbH Luoyang LIRR Refractories Co.

關鍵詞：reactivealuminaCORUNDUM-SPINELCASTABLESINTERINGREACTIVITYthermalshockresistance

分類號： TQ[化學工程]