直流电场下保护渣对氧化锆—碳耐火材料的侵蚀

Influence of protective slag on corrosion behavior of refractory material at slag line of nozzles under electric field

采用旋转搅拌法,在外加直流电场作用下进行了结晶器保护渣与水口渣线氧化锆—碳耐火材料的侵蚀试验,并研究直流电压(0、5、10 V)对保护渣与水口渣线材料界面行为的影响。结果表明,随着外加电压的增大,保护渣在水口耐火材料表面的附着量逐渐增加,保护渣的附着厚度在0、5、10 V时分别为2、3、7 mm。微观结构表明保护渣与水口材料界面存在的电场可以显著改变固—液两相间的润湿性,从而为熔渣向水口扩散、传质和渗透行为提供良好的动力学条件,且大电压下(10 V)的电场作用会加剧保护渣对材料的侵蚀。

In the paper,the corrosion test between the mold flux and the ZrO_(2)-C refractories at the slag line of nozzles under the action of applied direct current electric field was carried out using the rotating stirring method.The effect of the electric field on their interface behavior was studied.The results show that with the increase of the applied voltage,the adhesion amount of the mold flux on the surface of the nozzle refractories gradually increases.When the applied voltage is 0,5 and 10 V,the corresponding adhesion thickness of the mold flux is 2,3 and 7 mm,respectively.The microstructure shows that the electric field at the interface can significantly change the wettability between the mold flux and the nozzle refractories,which provides a good dynamic condition for the diffusion,mass transfer and penetration behaviors of the mold flux to the nozzle,and intensifies the corrosion of the mold flux on the refractories.