Innovative carbon-bonded filters based on a new environmental-friendly binder system for steel melt filtration

Himcinschi, Cameliu; Biermann, Claudia; Storti, Enrico; Dietrich, Björn; Wolf, Gotthard; Kortus, Jens; Aneziris, Christos G.

doi:10.1016/j.jeurceramsoc.2018.08.029

Cited by 30 publications

(47 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Open cellular ceramic foams are used in large quantities for filter applications for molten metals in casting, for example, refs. or exhaust gas filters, as catalyst support material, thermal insulation materials, or porous burners . Cellular ceramics have even found their way into medical engineering as bone replacement material …”

Section: Introductionmentioning

confidence: 99%

Hierarchical‐Porous Ceramic Foams by a Combination of Replica and Freeze Technique

Schelm

Fey²,

Dammler

et al. 2019

Adv Eng Mater

View full text Add to dashboard Cite

Open-porous alumina foams with additional strut porosity are fabricated by a two-step sponge-replication based manufacturing process. As the first step, open cellular ceramic foams are prepared following the Schwarzwalder sponge replication technique. Therefore, organic foam templates are coated with different aqueous alumina slurries with a solid load between 20 and 40 vol% In a second step, an additional porosity is generated inside the foam struts by freezing of the foams at temperatures between À196 and À20 C and subsequent sublimation drying. The hierarchical structure of both, cell pores and strut pores in the freeze-dried material remains intact after drying, template removal, and sintering. Size, connectivity, and morphology of the strut pores strongly depend on the solid load of the alumina slurry and on the freezing temperature. Cellular structures with a strut porosity between 50% and 60% and a total porosity exceeding 90% are prepared, which show a compressive strength in between 0.4 to 0.6 MPa. Due to the additional strut porosity, the specific surface area of freeze-dried replica foams increases from 70 cm 2 g À1 for conventionally prepared foams to 200 cm 2 g À1 for freeze-dried foams, respectively.

show abstract

Section: Introductionmentioning

confidence: 99%

Hierarchical‐Porous Ceramic Foams by a Combination of Replica and Freeze Technique

Schelm

Fey²,

Dammler

et al. 2019

Adv Eng Mater

View full text Add to dashboard Cite

show abstract

“…The Collaborative Research Center (CRC) 920 aims at developing filter materials and filtration techniques for metal melts to achieve a significantly higher purity of the resulting raw materials. For the specific purpose of removing nonmetallic impurities from molten steel, sintered oxidic filters [1][2][3][4] and carbon-bonded alumina foam filters [5][6][7][8] have been applied successfully. Currently, the standard manufacturing process of carbon-bonded filters includes the use of pitch binders such as CarboresP or closely related resins such as resoles and novolaks.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, the standard manufacturing process of carbon-bonded filters includes the use of pitch binders such as CarboresP or closely related resins such as resoles and novolaks. [5][6][7][8][9] However, a lactose/tannin mixture as binder has been investigated by Biermann [9] and Himcinschi et al [8] . Compared with all of the conventional, previously mentioned binders, lactose/tannin binders have the advantage of being environmentally friendly in the sense that they do not emit critical amounts of the carcinogenic agent benzo[a]pyrene during either filter production or operation.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with all of the conventional, previously mentioned binders, lactose/tannin binders have the advantage of being environmentally friendly in the sense that they do not emit critical amounts of the carcinogenic agent benzo[a]pyrene during either filter production or operation. [8,9] After curing at 180 C and subsequent coking at 200À500 C, lactose and tannin were reported to form an amorphous carbonaceous matrix around the ceramic particles, similarly to the network formed by novolak binders. [8,9] However, the carbon yield of the lactose/tannin binders after coking did not match the yield of pitch binders, which led to a lower cold crushing strength.…”

Section: Introductionmentioning

confidence: 99%

“…[8,9] After curing at 180 C and subsequent coking at 200À500 C, lactose and tannin were reported to form an amorphous carbonaceous matrix around the ceramic particles, similarly to the network formed by novolak binders. [8,9] However, the carbon yield of the lactose/tannin binders after coking did not match the yield of pitch binders, which led to a lower cold crushing strength. Although the addition of n-doped silicon or an alumina coating appeared to alleviate this issue to some extent, [8] further optimization of the binder properties is needed to increase the resistance of the filter materials to thermal shock.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Testing Self‐Interaction Correction for Molecules in Solution

et al. 2021

View full text Add to dashboard Cite

Two measures of reactivity, the ionization potential and the standard enthalpy of formation, are evaluated for the AQUA20 molecular test set in this theoretical study, comparing results from density functional theory, wavefunction approaches, and methods from the field of self-interaction correction. All calculations are carried out for the gas phase and for an aqueous solution as simulated with the conductor-like screening model. For the gas phase, previously reported tendencies are confirmed. With the presented computational approach for the aqueous solution, the application of self-interaction correction improves the standard enthalpies of formation, but not the ionization potentials.

show abstract

Raman Spectroscopic Characterization of Environmentally Friendly Binder Systems for Carbon‐Bonded Filters

et al. 2021

View full text Add to dashboard Cite

A contribution to the production of zero‐defect materials is the development of carbon‐bonded alumina foam filters for removing nonmetallic inclusions from molten metals. Herein, such filters containing various mixtures of Carbores P, lactose, and tannin as binder are investigated by Raman spectroscopy. The filter samples differ in whether or not they are fired and whether or not n‐Si is added to them. Raman measurements are also performed on samples of the individual binder substances, which have been preannealed at temperatures up to 1400 °C. The variation of the sp2 carbon cluster sizes due to the heat treatment is estimated using the intensity ratio of the D and G bands as determined from these measurements. The conversion of the samples from hydrogen‐rich amorphous carbon systems to nanocrystalline graphite is observed. The results show no significant differences between the binders in regard to the material properties that can be studied with Raman spectroscopy.

show abstract

Innovative carbon-bonded filters based on a new environmental-friendly binder system for steel melt filtration

Cited by 30 publications

References 24 publications

Hierarchical‐Porous Ceramic Foams by a Combination of Replica and Freeze Technique

Hierarchical‐Porous Ceramic Foams by a Combination of Replica and Freeze Technique

Testing Self‐Interaction Correction for Molecules in Solution

Raman Spectroscopic Characterization of Environmentally Friendly Binder Systems for Carbon‐Bonded Filters

Contact Info

Product

Resources

About