Alumina castables with addition of fibers produced by electrospinning

Storti, Enrico; Jiříčková, Adéla; Dudczig, Steffen; Hubálková, Jana; Aneziris, Christos G.

doi:10.1016/j.ceramint.2020.03.238

Cited by 5 publications

(13 citation statements)

References 22 publications

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“…Interestingly, thermal shocking had no significant influence under any test. Similar results were reported by Storti et al who investigated the influence of different fiber additives on the properties of cement-free alumina castables [ 56 ].…”

Section: Resultssupporting

confidence: 88%

Graphene-Reinforced Carbon-Bonded Coarse-Grained Refractories

et al. 2021

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Carbon-bonded alumina refractories offer excellent thermal shock performance but are lacking in terms of mechanical strength. In the present contribution, the influence of the particle packing and the addition of graphene oxide (GO) to carbon-bonded alumina refractories on the physical and mechanical properties before and after thermal shock was investigated. Coarse tabular alumina grains were coated by a GO suspension and used to prepare dry-pressed compacts. The included graphite fraction (15 wt%) was either regarded as a lubricating matrix component or as a quasi-spherical component of a calculated density-optimized aggregate size distribution. During coking, the GO was reduced to thermally reduced graphene. The porosity, true density and thermal shock behavior in terms of the cold modulus of rupture (CMOR) and Young’s modulus were compared. Samples with a higher density were obtained when the irregularly shaped graphite was considered as the matrix component (lubricant). The results showed that the use of GO had a positive impact on the mechanical properties of the graphene-reinforced Al2O3–C refractories, especially in the case of a less optimized packing, due to the bridging of delamination gaps. In addition, the thermal shock only had a minor impact on the Young’s modulus and CMOR values of the samples. SEM investigation revealed very similar microstructures in coked as well as thermally shocked samples.

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Section: Resultssupporting

confidence: 88%

Graphene-Reinforced Carbon-Bonded Coarse-Grained Refractories

et al. 2021

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“…This is also in agreement with the results obtained from the water immersion measurements reported in Table 2. The same behavior was observed in our previous study 18 for high-alumina castables bonded with Alphabond 300.…”

Section: F I G U R Esupporting

confidence: 89%

“…This assumption is supported by the results: the batch LC-TiO 𝑥 -3 showed higher density, lower permeability, lower porosity, and also high CMOR loss after one thermal shock cycle (53.71%) than the LC-TiO 𝑥 one (51.79%). These cannot be directly compared with our previous ones, 18 since this time calcium aluminate cement was used instead of hydratable alumina as binder. Accordingly, the phase composition after sintering was clearly different (see also Figure 10).…”

Section: Open Porosity (%)mentioning

confidence: 87%

“…In terms of residual strength after thermal shock, the batch produced with electrospun fibers performed best. Conversely, the pore channels left by the PP fibers favored the crack propagation 18 …”

Section: Introductionmentioning

confidence: 98%

“…In our previous work 18 , nano‐sized fibers (with diameter

&lt;

\mu

m) produced by electrospinning were tested in refractory castables for the first time and their impact on various properties was analyzed. The reference formulation was a cement‐free, high‐alumina castable mass.…”

Section: Introductionmentioning

confidence: 99%

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Electrospun fibers as drying additive in cement‐bonded alumina castables

Storti

Himcinschi

Neumann

et al. 2022

Int J Applied Ceramic Tech

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A simple system to produce titanium dioxide precursor fibers by electrospinning was developed. The phase composition of the fibers was analyzed before and after heat treatment by means of Raman spectroscopy. The effect of these fibers and commercial polypropylene fibers (PP) on low‐cement high‐alumina castables was evaluated. Thermogravimetry was used to investigate the drying behavior of the different batches. In addition, the permeability of sintered cylinders was compared. Elastic moduli and cold modulus of rupture were measured on sintered and on thermally shocked samples to evaluate the thermal shock resistance. As in our previous work, the results showed that the fiber addition was beneficial for the drying behavior. However, the use of electrospun fibers likely caused water retention in the samples during storage. The batch containing PP fibers showed the highest final permeability, confirmed also by mercury intrusion porosimetry and by scanning electron microscopy. Otherwise, the precursor fibers left no pore channel after sintering and the permeability of this batch was the lowest. Thermal shock had no clear impact on bulk density or open porosity for any of the batches. Due to the presence of calcium oxide from the cement binder, hibonite (CaAl12$_{12}$O19$_{19}$) was detected by XRD alongside corundum in all samples.

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Pore evolution and slag resistance of corundum castables with nano zirconia addition

Qiao

Chen

et al. 2021

Ceramics International

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Alumina castables with addition of fibers produced by electrospinning

Cited by 5 publications

References 22 publications

Graphene-Reinforced Carbon-Bonded Coarse-Grained Refractories

Graphene-Reinforced Carbon-Bonded Coarse-Grained Refractories

Electrospun fibers as drying additive in cement‐bonded alumina castables

Pore evolution and slag resistance of corundum castables with nano zirconia addition

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