Morphologies of Alumina Nano- and Microparticles at the Fe/Al2O3 Interface and the Effects of Reaction Time and Substrate Roughness on Size Distribution

Lee, Young Seok; Jung, Seung Boo; Park, Joo Hyun; Min, Dong Joon

doi:10.2355/isijinternational.53.547

Cited by 3 publications

(3 citation statements)

References 18 publications

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“…chemical, and phase composition were not satisfactorily estimated within this study. Nevertheless, the morphology closely investigated by SEM is in excellent agreement with reports of endogenous inclusions that originate from aluminum killing during steelmaking [15][16][17]26,27] and component failure that was traced back to alumina inclusions. [3,28] 3.4.…”

Section: Deposited Clustersupporting

confidence: 73%

Functionalized Carbon‐Bonded Filters with an Open Porous Alumina Coating: Impact of Time on Interactions and Steel Cleanliness

et al. 2017

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Understanding interactions between filter and molten steel is essential to improve the purity of casted products by filtration. Characteristic, in situ formed layers on the surface of carbon-bonded alumina filters result from these interactions. To comprehend their formation, this study illustrates the time dependency of the layer buildup. Therefore, reactions at the filter/steel interface under quasi static conditions are examined using spark plasma sintering (SPS) equipment. Immersion tests in a steel casting simulator, which provides close-to-reality conditions, complement these investigations. Microstructure and phase analyses reveal that interfacial reactions between filter and steel lead to a thin in situ formed layer on the filter surface. During a "reactive" stage, large polycrystalline alumina structures are formed. Thereby, material is transported both from the carbon-bonded material underneath (i.e., gaseous reaction products) and from the molten steel (i.e., precipitating particles and endogenous inclusions) to the filter/steel interface. The formation of these alumina particles comes to an end as soon as the carbon supply, which triggers the dissolution and precipitation processes at the interface, is cut-off. From that point on, endogenous inclusions are deposited on them ("active" stage). The filters were most efficient during the reactive stage, that is, as long as the interfacial reactions take place.

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Section: Deposited Clustersupporting

confidence: 73%

Functionalized Carbon‐Bonded Filters with an Open Porous Alumina Coating: Impact of Time on Interactions and Steel Cleanliness

et al. 2017

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“…[67] Copyright 2009, Wiley-VCH GmbH. authors like Lee et al [72] claim that dendritic alumina inclusions are not formed by nucleation and growth mechanisms but by multiple nanoparticles' clustering-sintering processes.…”

Section: Atomic Attachment and Interface Instabilitymentioning

confidence: 99%

Alumina Nucleation, Growth Kinetics, and Morphology: A Review

González-Solórzano

Morales

Ávila

et al. 2023

steel research int.

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The reaction between aluminum and the dissolved oxygen in liquid steel yields the precipitation of alumina crystals with characteristic morphologies and size distributions. Alumina precipitation and growth involve a wide spectrum of time, length, velocity, and thermodynamic supersaturation scales throughout the refining processes. The smallest length and time scales are those quantifying the nucleation kinetics and the initial growth at the highest supersaturation. Further growth and crystal morphology depend on the concentration of surface tension elements which inhibit the crystal's faces suffering further modifications due to washing effects provided by turbulent flows. This step involves longer time, velocity, length, and moderate supersaturations. The final step involves the growth of alumina inclusions through collision–agglomeration–sintering, and capillary processes on the surfaces of argon bubbles under low supersaturations. Jumps of supersaturation, due to late aluminum additions or steel reoxidation, lead to alumina crystals changing their morphology to dendritic‐type growth. The present contribution reviews each one of these kinetic phenomena closing with the consequences that alumina precipitation has on the continuous casting process. The content of this review is useful to practitioners and theorists alike.

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“…11 It was reported that the surface roughness of refractory linings greatly affects the size distribution of inclusions in molten Fe. 12 However, insufficient information about the reaction mechanism is available even though the control of the inclusions in Al killed steels has been of great concern in the steel industry for many years. In addition, it has been pointed out that the formation of metastable secondary particles cannot be avoided during sampling since the sampling conditions have great influence on the morphology and size of inclusions in steel.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface roughness of MgO substrate on size distribution of inclusions

Lee

Jung

Min

2013

Ironmaking & Steelmaking

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Experiments were carried out to investigate the effect of surface roughness of MgO substrate on the formation and size distribution of inclusion particles employing new experimental methodology. The reaction of MgO refractory with Al deoxidised liquid Fe can take place, which results in forming both MgO and spinel type of inclusions. The number density of inclusions increases with increasing surface roughness of the substrate, which could be explained by Gibbs-Thompson effect. Activated interfacial reactions between the substrate and liquid Fe are believed to be more dominant than the effect of increased surface roughness of the substrate on the number density of inclusions. It is recommended to use Al 2 O 3 based nozzle than MgO based one of similar surface roughness from a viewpoint of the generation of lower number density of inclusions.

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Morphologies of Alumina Nano- and Microparticles at the Fe/Al2O3 Interface and the Effects of Reaction Time and Substrate Roughness on Size Distribution

Cited by 3 publications

References 18 publications

Functionalized Carbon‐Bonded Filters with an Open Porous Alumina Coating: Impact of Time on Interactions and Steel Cleanliness

Functionalized Carbon‐Bonded Filters with an Open Porous Alumina Coating: Impact of Time on Interactions and Steel Cleanliness

Alumina Nucleation, Growth Kinetics, and Morphology: A Review

Effect of surface roughness of MgO substrate on size distribution of inclusions

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