Impact of spinel forming systems (Fe-/Mg-/Mn-Al-O) as functional coating materials for carbon-bonded alumina filters on steel melt filtration

Bock, Benjamin; Schmidt, Anne; Śnieżek, E; Dudczig, Steffen; Schmidt, Gert; Szczerba, Jacek; Aneziris, Christos G.

doi:10.1016/j.ceramint.2018.11.131

Cited by 11 publications

(5 citation statements)

References 26 publications

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“…A few cracks of the coating were observed, but they, too, were covered by this layer and thus coating fragments remained on the filter. Furthermore, steel drops always stayed on filter struts, which is in accordance to reports of Dudczig et al, Storti et al, and Bock et al Noticeably, more steel remained in the macropores of the samples containing titania, especially near the lower edge of the filter, which had the longest residence time within the melt. In those areas, the coating adhered strongly to the solidified steel and was cracked during cooling down, due to the higher thermal expansion of the steel.…”

Section: Resultssupporting

confidence: 91%

“…As a result of the interfacial reactions between filter and steel melt, a layer build‐up on the filter surface was observed on all investigated samples by electron microscopy. That layer‐build‐up is quite similar to the ones reported by Storti et al, Bock et al, and Schmidt et al The latter one proposed a scheme to describe the observed structures and to illustrate interactions between alumina‐coated Al 2 O 3 –C filters and molten steel. To avoid any confusion, this article adopts the denotations of Schmidt et al to describe similar structures.…”

Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

“…In recent years, research has increasingly focused on the interactions between filter materials and molten steel to fully exploit the potential of ceramic foam filters for steel melt filtration. [1][2][3] Different material compositions of the filter surface might increase inclusion segregation from the steel melt. Emmel et al [4] observed different amounts of particles on alumina, mullite, or carbon-bonded magnesia coated Al 2 O 3 -C filters after casting trials.…”

Section: Introductionmentioning

confidence: 99%

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Interactions between Carbon‐Bonded Alumina Filters and Molten Steel: Impact of a Titania‐Doped Filter Coating

et al. 2019

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Herein, the influence of adding titania to the carbonaceous alumina coating of Al2O3–C filters on the interactions with molten steel is investigated. Therefore, coated filters are immersed for 30 s in molten steel (42CrMo4) at 1580 °C. Mainly by microstructural and chemical analyses, the immersed filters as well as the solidified steel are characterized. Due to the reducing atmosphere of the heat treatment during sample manufacturing, the formation of aluminum titanate phases in the coating is not observed. During immersion, on the one hand, titania acts as the sintering agent for alumina within the coating and for precipitated alumina inclusions from the melt. On the other hand, dissolved titanium in the melt decreases the surface tension and thus increases wetting of the steel melt on the filter surface. The results indicate that more but smaller alumina inclusions remain in the solidified steel if titania is added to the coating. Thus, the modification of alumina inclusions by adding titania to the filter coating presents a way to tailor these inclusions depending on the product's application.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interactions between Carbon‐Bonded Alumina Filters and Molten Steel: Impact of a Titania‐Doped Filter Coating

et al. 2019

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“…The resulting filter height exceeded 20 mm, being comparable with a common filter size in previous studies. [2,34,35] Recapitulated, the shaping of filters with complex structures and the removal of the filter template was successfully achieved in one step without any thermal treatments. The aforementioned, unavoidable defects can be cured by a subsequent coating step before the pyrolysis, which is investigated in the following.…”

Section: Filter Structure After Alginate-based Slip Coatingmentioning

confidence: 99%

Fabrication of Carbon‐Bonded Alumina Filters by Additive‐Manufactured, Water‐Soluble Polyvinyl Alcohol Filter Templates and Alginate‐Based Slips

et al. 2021

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Carbon-Bonded Filter Materials and Filter Structures with Active and Reactive Functional Pores for Steel Melt Filtration

Bock-Seefeld,

Gehre,

Aneziris

2024

Springer Series in Materials Science

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There exists an increasing pressure on the metal making and metal using industry to remove solid and liquid inclusions such as deoxidation products, sulfides, nitrides carbides etc. and thereby improve metal cleanliness. It is well known that size, type and distribution of non-metallic inclusions in metal exert considerable effects on the mechanical properties of the cast products. In terms of this contribution a new generation of metal qualities via melt filtration with superior mechanical properties for use in light weight structures and high demand construction materials are explored. The main target is an enormous reduction of non-metallic inclusions in the metal matrix by the use of intelligent filter materials as well as filter systems with a functionalized filter surface. Especially a new generation of combined refining filter systems will be illustrated. The metal melt comes first in contact with a reactive filter which generates gas bubbles in the melt as well as activates gas bubbles on the surface of the inclusions. As a result, a kind of flotation of the inclusions towards the slag on the surface of the melt takes place. Further the high reactivity as well as the gas bubbles contribute to the agglomeration of the fine inclusions to big clusters which flow due to buoyancy forces to the surface of the melt or are filtrated on the surface of active filters, which do not form gas bubbles but provide on their functionalized surfaces the same chemistry as the inclusions for a sufficient adhesion and as a result for a sufficient filtration of the inclusions. With this approach a purification higher than 95% can be achieved. Another topic is dealing with carbon-bonded filter materials based on environmentally friendly binder system based on lactose and tannin. Furthermore, functional calcium aluminate coatings in combination with carbon are studied with regard to their impact on the active/reactive filtration and flotation in steel melts, respectively. Another major focus is the investigation of water-soluble filter skeleton-templates, which are produced by 3D-hybrid-printing techniques and coated by flame spraying technology. Subsequently, the filter skeleton-templates are removed in water, avoiding sharp-edged cavities inside the filter.

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Impact of spinel forming systems (Fe-/Mg-/Mn-Al-O) as functional coating materials for carbon-bonded alumina filters on steel melt filtration

Cited by 11 publications

References 26 publications

Interactions between Carbon‐Bonded Alumina Filters and Molten Steel: Impact of a Titania‐Doped Filter Coating

Interactions between Carbon‐Bonded Alumina Filters and Molten Steel: Impact of a Titania‐Doped Filter Coating

Fabrication of Carbon‐Bonded Alumina Filters by Additive‐Manufactured, Water‐Soluble Polyvinyl Alcohol Filter Templates and Alginate‐Based Slips

Carbon-Bonded Filter Materials and Filter Structures with Active and Reactive Functional Pores for Steel Melt Filtration

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