电场作用下熔铁与铝碳质水口耐材间的润湿和侵蚀行为

Wetting and erosion behavior between molten iron and aluminum-carbon water nozzle in electric field

探究了外加电场作用下铁熔体与水口组成材料间的润湿和侵蚀行为。通过高温电润湿实验可知,在铁熔体和水口组成材料基板间施加电场,促进了铁熔滴与固体基板间的润湿,且在一定电场强度范围内,固-液相间的接触角随着电场强度的增加而减小,固-液相间的润湿性变好。对电润湿后两相界面的微观结构进行了分析,结果表明外加电场促进了铁熔体与水口组成材料间的原子迁移,显著改善固液两相界面间的传质、扩散和溶解等作用。电润湿反应过程中铝碳水口表面经脱碳后产生了孔隙,并且在外加电场作用下铁熔体易于向水口基板内部渗透,导致铁熔体对铝碳水口的侵蚀程度较高纯石墨和氧化铝基板更为严重。

The wetting and erosion behavior between the iron melt and the nozzle constituent materials under the action of an external electric field was explored.Through the high-temperature electrowetting experiment,it can be seen that the wetting between iron melt and water port substrate is promoted by applying electric field,and the contact angle between solid and liquid phase decreases with the increase of electric field intensity in a certain range,and the wettability between solid and liquid phase becomes better.The microstructure of the two-phase interface after electrowetting was analyzed,and the results show that the atom migration between the iron melt and the nozzle constituent material is promoted by the applied electric field,and the mass transfer,diffusion and dissolution between the solid-liquid two-phase interface are also significantly improved.During the electrowetting reaction process,the surface of the aluminum-carbon nozzle is decarburized to generate pores,and the iron melt is easy to penetrate into the nozzle substrate under the action of external electric field,resulting in a higher degree of erosion of aluminum carbon nozzle by iron melt,especially on pure graphite and alumina substrate.