Development of multi-walled carbon nanotubes-based coatings on carbon-bonded alumina filters for steel melt filtration

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

“…EDX and EBSD investigations confirmed that these crystals consist of trigonal alpha alumina. These observations are in excellent agreement with data reported by Dudczig et al [24] and Storti et al [18,25] Figure 7 represents analyses of these alumina crystals. The morphology of these particles and EBSD examinations implied that they were polycrystalline.…”

“…Thus, some steel might have moved through the coating material and might have contributed to these microstructural changes. Similar observations have been reported by [18,19,24,25] on carbon-bonded alumina and also on coated Al 2 O 3 -C filters. [24] According to them, these changes emanated from decarburization that had been triggered by iron acting as catalyst.…”

“…[24] According to them, these changes emanated from decarburization that had been triggered by iron acting as catalyst. [13,18,19,24,25] Section 4 describes the decarburization in more details. Despite some cracks, which were probably caused by the strong thermo-shock, no distinct changes were observed at the coating/steel interface after 1 min testing time.…”

Impact of Nanoengineered Surfaces of Carbon‐Bonded Alumina Filters on Steel Cleanliness

“…Storti et al have recently applied a MWCNTs-based coating on standard carbon-bonded alumina filters, in order to accelerate the formation of the thin alumina layer and to possibly improve the filtration efficiency. [14] These filters were tested together with uncoated Al 2 O 3 -C samples in a so-called metal casting simulator: 10 ppi (pores per inch) prismatic foam samples (125 Â 20 Â 20 mm 3 ) were immersed into molten steel at 1 650 C, containing artificially-generated endogenous alumina inclusions, under a fully controlled Ar atmosphere. Microscope investigations after the test suggested a better performance of the MWCNTs-coated filters compared to the uncoated ones, at least for short immersion times (10/30 s).…”

Influence of the Specimen Manufacturing Process on the Strength of Carbon‐Bonded Alumina (Al2O3–C)

“…The compostition is equal to the one described for the carbonbonded alumina filters by Emmel and Aneziris [1] and Storti et al [7] It consists of mainly 99.8% pure alumina (Martoxid MR 70, Martinswerk, Germany, d 90 3.0 mm). Additionally, there are three different carbon sources: modified coal tar pitch powder (Carbores 1 P, Ruẗgers, Germany, d 90 0.2 mm), fine natural graphite (AF 96/97, Graphit Kropfmuḧl, Germany, 96.7 wt% carbon, 99.8 wt% 40 mm), and carbon black powder (Luvomaxx N-911, Lehmann & Voss & Co., Germany, !…”