Influence of Interface Electric Field on Wettability Between Molten Iron and Submerged Entry Nozzle Interface
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https://doi.org/10.1007/s11837-020-04240-2 Ó 2020 The Minerals, Metals & Materials Society
INTERFACIAL STABILITY IN MULTI-COMPONENT SYSTEMS
Influence of Interface Electric Field on Wettability Between Molten Iron and Submerged Entry Nozzle Interface XIN YANG,1 YUANYUAN ZHANG,1 LEI YUAN,2 FEIXIONG MAO,3 JINGKUN YU,2,4 and ZHIJUN HE1,5 1.—School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China. 2.—School of Metallurgy, Northeastern University, Shenyang 110819, People’s Republic of China. 3.—Ningbo Key Laboratory of Marine Protection Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China. 4.—e-mail: [email protected]. 5.—e-mail: [email protected]
The study of submerged entry nozzle clogging dynamics mainly focuses on the interface wetting behavior. So as to understand the effect of the interface electric field on the wetting behavior between the immersion nozzle and the molten steel, electrowetting experiments and field industrial tests were performed. The results show that the wettability between the iron droplet and the nozzle constituent material can be improved by applying an electric field, and the solid–liquid wetting angle decreases with increasing voltage. There is an electric field at the interface between the submerged entry nozzle and molten steel during continuous casting, and the resulting electrowetting effect significantly changes the wetting behavior between the molten steel and the nozzle, which promotes the interaction between the two phases resulting in a large amount of deposits on the inner surface of the submerged entry nozzle, causing nozzle clogging.
INTRODUCTION The submerged entry nozzle (SEN) is an important functional refractory material for connecting the tundish and crystallizer during the casting process of molten steel. However, when casting aluminum killed steel, titanium, and rare element steel, a deoxidation product is formed. It is easy for the deoxidation product to stick to the inner surface of the SEN, thereby leading to the accretion, clogging, and corrosion of the SEN. In serious cases, it can even affect the production efficiency and the properties of the steel.1–3 Analysis of the microstructure of the clogging in SEN indicates that the clogging is composed of the decarburization layer of the refractory material, the reaction layer (i.e., the dense layer of the reticulated Al2O3), and the adhesion layer (i.e., the loose layer of the stacked Al2O3). The decarburization of the SEN or the formation of a decarburized layer is the source causing the blockage and corrosion of the SEN. It is formed by the carbon on the inner wall surface of the Al2O3-C material SEN, which is dissolved by the
molten steel. Once the decarburization layer is formed, the exposed Al2O3 inclusions on the inner surface of the SEN are in direct contact with the molten steel. The high melting point oxide in the molten steel can react with the Al2O3 particles to form a thin aluminate layer and
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