A novel route for manufacturing asymmetric BSCF-based perovskite structures by a combined tape and freeze casting method

Rachadel, Priscila Lemes; Souza, Douglas F.; Nunes, Eduardo H.M.; Costa, João C. Diniz da; Vasconcelos, Wander L.; Hotza, Dachamir

doi:10.1016/j.jeurceramsoc.2017.04.035

Cited by 25 publications

(24 citation statements)

References 50 publications

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“…This was not reported before, (cut) before being used. However, ice-templated thin films have recently gained traction for a number of applications such as dye-sensitized solar cells or solid oxide fuel cells [9,[37][38][39].…”

Section: Effect Of Crystal Tilt On Particle Segregationmentioning

confidence: 99%

Multiphase imaging of freezing particle suspensions by confocal microscopy

Dedovets

Deville

2018

Journal of the European Ceramic Society

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Ice-templating is a well-established processing route for porous ceramics. Because of the structure/properties relationships, it is essential to better understand and control the solidification microstructures. Ice-templating is based on the segregation and concentration of particles by growing ice crystals. What we understand so far of the process is based on either observations by optical or X-ray imaging techniques, or on the characterization of ice-templated materials. However, in situ observations at particle-scale are still missing. Here we show that confocal microscopy can provide multiphase imaging of ice growth and the segregation and organization of particles. We illustrate the benefits of our approach with the observation of particles and pore ice in the frozen structure, the dynamic evolution of the freeze front morphology, and the impact of PVA addition on the solidification microstructures. These results prove in particular the importance of controlling both the temperature gradient and the growth rate during ice-templating. * sylvain.deville@saint-gobain.com 1 arXiv:1712.07707v1 [cond-mat.soft]

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Section: Effect Of Crystal Tilt On Particle Segregationmentioning

confidence: 99%

Multiphase imaging of freezing particle suspensions by confocal microscopy

Dedovets

Deville

2018

Journal of the European Ceramic Society

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“…In contrast, secondary drying involves removal of the unfrozen or bound solvent molecules at warmer temperatures, usually above the freezing point . For the complete removal of the frozen solvent from ceramic structures, freeze drying for one to several days has been a common practice . Thus, reduction in the freeze drying time, especially primary drying time, is a key factor to achieve a fast and competitive freeze casting process.…”

Section: Resultsmentioning

confidence: 99%

“…38,39 For the complete removal of the frozen solvent from ceramic structures, freeze drying for one to several days has been a common practice. 36,40,41 Thus, reduction in the freeze drying time, especially primary drying time, is a key factor to achieve a fast and competitive freeze casting process. Due to the confinement of the tube's exposed area inside of a mold during the freeze drying process, the removal of ice from the freeze-cast tubes is more challenging than that from the freeze-cast sheets or planar structures.…”

Section: Resultsmentioning

confidence: 99%

Tubular solid oxide fuel cells fabricated by a novel freeze casting method

et al. 2019

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Freeze casting is an established method for fabricating porous ceramic structures with controlled porosity and pore geometries. Herein, we developed a novel freeze casting and freeze drying process to fabricate tubular anode supports for solid oxide fuel cells (SOFCs). Freeze casting was performed by injecting aqueous anode slurry to a dual‐purpose freeze casting and freeze drying mold wrapped with peripheral coils for flowing a coolant. With the use of an ice barrier layer, proper control of the experimental setup, and adjustments in the drying temperature profile, complete drying of the individual anode tubes was achieved in 4 hours. The freeze‐cast anode tubes contained radially aligned columnar pore channels, thus significantly enhancing the gaseous diffusion. SOFC single cells with conventional Ni/yttria‐stabilized zirconia/strontium‐doped lanthanum manganite materials were prepared by dip coating the thin functional layers onto the anode support. Single cell tests showed that the concentration polarization was low owing to the highly porous anode support with directional pores. With H2/N2 (1:1) fuel, maximum power densities of 0.47, 0.36, and 0.27 W/cm2 were recorded at 800°C, 750°C, and 700°C, respectively. Our results demonstrate the feasibility of using freeze casting to obtain tubular SOFCs with desired microstructures and fast turn‐around times.

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“…The complimentary use of tape casting during the ice templating process is a relatively new development in freeze casting methods that combines the scale-up potential for large area substrates and thin cross-sections for which porous ceramics are often sought. [7][8][9][10][11][12][13][14] Studies in ice templating methods have well established general methods of pore size and morphology control, 15 it is generally represented that casting at specific freezing rates and solid loading will yield a common pore structure that is independent of specimen orientation with regard to the solidification front, aside from the convergence of pore columns during the solidification process. However, it has been established in aqueous systems that the ice crystals grow into nonuniform acicular morphologies when observed parallel to the direction of growth.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic microstructural anisotropy in tape cast ceramics by ice templating

Heywood

Romanenko

Sofie

et al. 2020

Int J Applied Ceramic Tech

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Ice templating concepts based on tape cast processing technology are capable of creating continuous columnar‐graded pore structures using a wide variety of ceramic oxides with thicknesses from 100 µm up to 1 cm for applications including fuel cells, compositional grading templates, filtration/separation membranes, and catalyst supports. The merging of the tape casting process allows for the preparation of large area flexible green tapes as well as the long‐range alignment of the acicular ice crystals transverse to the cross‐section, yielding an additional degree of microstructure control beyond traditional freeze cast processing. Moreover, optimization of the freeze tape casting processing parameters has proven effective in tailoring porosity in aqueous cast ceramics. Magnetic resonance microscopy (MRM) combined with scanning electron microscopy (SEM) has revealed inherent microstructural anisotropy in the morphology of pores related to the direction of the cast tape. Due to the ability of MRM to image noninvasively with volume averaging over a range of slice thicknesses, the MRM images provide complementary information to the higher resolution single plane SEM images. Morphological variance as observed at different orientations through the cross‐sections of cast yttria stabilized zirconia is reported.

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A novel route for manufacturing asymmetric BSCF-based perovskite structures by a combined tape and freeze casting method

Cited by 25 publications

References 50 publications

Multiphase imaging of freezing particle suspensions by confocal microscopy

Multiphase imaging of freezing particle suspensions by confocal microscopy

Tubular solid oxide fuel cells fabricated by a novel freeze casting method

Intrinsic microstructural anisotropy in tape cast ceramics by ice templating

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