Investigation of the Effect of Al2O3–SiO2 Ceramic Coating on the Hot Oxidation Kinetics of Steel Products in Preheating Furnaces

Laribaghal, Seyed Mohammad; Khorasanian, Mehdi; Eskandari, Mostafa; Alavi Zaree, Seyed Reza

doi:10.22050/ijogst.2024.432392.1700

Investigation of the Effect of Al2O3–SiO2 Ceramic Coating on the Hot Oxidation Kinetics of Steel Products in Preheating Furnaces

Document Type : Research Paper

Authors

Seyed Mohammad Laribaghal ¹

Mehdi Khorasanian ²

Mostafa Eskandari ²

Seyed Reza Alavi Zaree ¹

¹ Assistant Professor, Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

² Associate Professor, Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

https://doi.org/10.22050/ijogst.2024.432392.1700

Abstract

In steel production plants, such as those manufacturing sheets, pipes, and round bars, raw materials are annealed in preheating furnaces at approximately 1200 °C before undergoing hot deformation. Substantial oxidation and loss of raw steel materials occur in preheating furnaces, resulting in significant economic losses. A potential solution to reduce losses in this scenario is the application of protective ceramic coatings. This research investigates the effect of a ceramic coating based on Al₂O₃–SiO₂ on the oxidation behavior of steel sheets. The industrial-scale impact of the coating on the oxidation of steel slabs is also examined. The coating was applied using a spray method with slurry ceramic materials dispersed through a compressed air flow. Thickness measurement tests, scanning electron microscopy, and energy dispersive X-ray spectroscopy (EDS) analysis were conducted to evaluate the kinetics, microstructure, and oxidation behavior of the coatings. The findings indicated that the oxidation kinetics for uncoated steel sheets followed a parabolic trend, while the kinetics for ceramic-coated samples exhibited a slower logarithmic behavior. The application of the coating resulted in a reduction of the oxide layer thickness by less than 30% compared to the uncoated samples, attributed to a lower diffusion coefficient in the coated samples. Applying the ceramic coating on ST52 slabs in industrial tests led to a significant reduction in the oxide layer thickness and a more straightforward peel of the oxide layers. This showed that using such ceramic coating for materials in preheating furnaces could effectively reduce oxidation losses and enhance the mechanical quality of final products.

Highlights

Lower oxidation kinetics was observed with the application of the ceramic protective coating on steel sheets.
The ceramic coatings decreased the atomic defects of the oxide layer, so higher resistance to oxidation was achieved.
The ceramic coating on the slab significantly decreased thickness and adhesion to the substrate of the oxide layer.

Keywords

Oxidation Resistance

Protective Ceramic Coating

Preheating Furnaces

Economic Savings

Slab

Subjects

Material Engineering

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