Understanding interactions between filter and molten steel is essential to improve the purity of casted products by filtration. Characteristic, in situ formed layers on surface carbon‐bonded alumina filters result from these interactions. To comprehend their formation, this study illustrates time dependency layer buildup. Therefore, reactions at filter/steel interface under quasi static conditions are examined using spark plasma sintering (SPS) equipment. Immersion tests a casting simulator,...

In order to explore the influence of nano-sized materials on steel filtration, carbon-bonded alumina filters are coated with multi-walled carbon nanotubes and nanosheets. The samples tested for different times in contact a melt containing endogenous inclusions at 1650 °C. Investigations after test reveal typical layer buildup described literature. After 60 s fine found top layer. By means special automatic SEM, tests thoroughly analyzed. population detected is classified terms size...

Ag, Cu and Sn based electrocatalysts promise high CO2 reduction kinetics effiencies on gas diffusion electrodes. Cu, sulfide catalysts in particular may offer altered electronic properites and...

Structural changes occurring during the conversion of boehmite over transient phases γ‐, δ‐ and θ‐Al 2 O 3 to corundum were investigated. During whole transition process, specific surface area was reduced. The X‐ray electron diffraction experiments revealed that from γ‐ is continuous it proceeds different δ‐states rather than a distinct δ‐Al phase. reduction most pronounced prior onset phase γ‐Al first δ‐state. In , approximately 45% Al cations found be located on tetrahedral sites within...

Metal melt filtration has become very popular over the past decades as it provides possibility of removing nonmetallic inclusions from metal melts and reduces amount flow turbulence during mold filling. However, especially, steel is associated with particularly harsh conditions which might require special filter solutions regarding increased strength specified path. Herein, a novel approach for manufacturing cellular ceramic materials investigated. Thereby, slurry containing alginate pumped...

Abstract With the objective to develop both characterization methods and test systems for blood tissue compatibility, some polymers, e.g., polyethylene (PE), polypropylene (PP), ethylene/propylene/diene‐ter‐polymer (EPDM) of different shapes, beads, films, tubes, fibers, tubings, microtome slices, were grafted with a variety 15 monomers in order introduce hydrophobic, hydrophilic, ionizable groups. The surface was characterized morphologically by area (Brunauer‐Emmett‐Teller: BET value),...

In the present article, performance and efficiency of ceramic filters for continuous steel filtration in an induction crucible furnace, which is part casting simulator facility located at Technische Universität Bergakademie Freiberg, investigated numerically. order to achieve this objective, a macro‐scale simulation melt flow coupled with pore‐scale inside filter that adequately resolved by its detailed geometry, obtained from computed tomography scan images. The considerable influence on...

Abstract Ceramic foam filters play an essential role in the quest for cleanliness of cast steel parts as they facilitate turbulence reduction during mold filling well removal nonmetallic inclusions. A coating on these is able to increase their strength and filtration efficiency by improving adhesion inclusions filter strands. In this study, Al 2 O 3 ‐C were coated with alumina slip via flame spraying. The phase composition microstructure coatings investigated before after immersion into...

Non‐metallic inclusions can affect significantly the mechanical properties of metallic materials. Mainly for safety relevant components, it is important to reduce size and number non‐metallic inclusions. Recent research work focused on development new reactive, active, functionalized filters reduction A detailed knowledge genesis essential improve entrapment capability. The paper microstructure formed in cast steel 42CrMo4 after application two filter variants. Both, surface as well as‐cast...

To improve metal purity by reducing solid and liquid inclusions, intelligent filters with a functionalized surface are studied for an application in melt filtration. Besides special coatings that increase the attraction of inclusions at filter or react gases inside melt, also roughness might filtration efficiency. In this study, we investigate influence on adhesion forces hydrophilic hydrophobic surfaces water‐based model system atomic force microscope. case substrates, decrease whereas...

This contribution is dealing with the phenomenological characterization of cracking and damage two different brittle foam materials (ceramic foams glass foams) under compressive load. The compression tests were performed in situ X‐ray microtomograph order to visualize formation single crack patterns 3D. Successive microtomographic scans at levels strain provide an insight into stressed microstructure ceramic foams. linked evaluation registered load‐displacement curves clarify mechanical...

Interactions between exogenous MgO particles and endogenous inclusions on the surface of a high alloyed steel melt have been investigated in situ temperature confocal laser scanning microscope. Exogenous magnesia particle forms immediately liquid Mg–Si–Al–Ti–Cr phase surrounding solid particle. The real attraction forces layer Al 2 O 3 are determined range 6 × 10 −18 N to 1 −16 N. In contrast earlier investigations with particles, lower pairs observed comparison pairs.

Open cell ceramic foam filters are used for metal melt filtration to reduce non‐metallic inclusions. A new generation of multifunctional made carbon‐bonded alumina is investigated within the Collaborative Research Center CRC 920. These have withstand high thermal and mechanical loads. Motivated by problem integrity, a characterization bulk material necessary. In Ball On Three Balls Test (B3B) miniaturized disk‐shaped specimens loaded with spherically tipped punch until failure occurs. With...

Herein, the influence of adding titania to carbonaceous alumina coating Al 2 O 3 –C filters on interactions with molten steel is investigated. Therefore, coated are immersed for 30 s in (42CrMo4) at 1580 °C. Mainly by microstructural and chemical analyses, as well solidified characterized. Due reducing atmosphere heat treatment during sample manufacturing, formation aluminum titanate phases not observed. During immersion, one hand, acts sintering agent within precipitated inclusions from...

A quantitative titration of the amount magnesium hydroxide in milk magnesia using only items purchased grocery and retail stores is reported. Either vinegar or a solution food grade citric acid serves as titrant, while dyes advertised being extracted from natural sources provide end-point indicator. An inexpensive, digital kitchen balance with 0.01 g resolution allows for quantitation titrant added. Students who performed this experiment either class remotely generally determined amounts...

Abstract The importance of superhydrophilicity glass surfaces lies in their self‐cleaning abilities. need for antifogging characteristics soda‐lime‐silica (SLS‐) based window glasses requires feasible solutions. Superhydrophilicity is generally achieved by textured with suitable features or any chemical modification including thin films. Fabrication usually involves sophisticated facilities that are often expensive. This paper reveals a novel approach to achieving superhydrophilic SLS...