The effect of the production method on the mechanical strength of an alumina porous hollow fiber

Wit, Patrick de; Daalen, Frederique S. van; Benes, Nieck Edwin

doi:10.1016/j.jeurceramsoc.2017.03.062

Cited by 8 publications

(4 citation statements)

References 29 publications

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“…Many inorganic materials such as ceramics and stainless steel have been manufactured as porous substrates, though alumina is the most used material due to lower costs and processing versatility. Porous substrates come in several geometries such as tubes, hollow fibers, and flat surfaces …”

Section: Introductionmentioning

confidence: 99%

“…Many inorganic materials such as ceramics [20][21][22] and stainless steel [23][24][25] have been manufactured as porous substrates, though alumina is the most used material due to lower costs and processing versatility. Porous substrates come in several geometries such as tubes, [14,[26][27][28] hollow fibers, [29][30][31] and flat surfaces. [19,32] Traditionally, inorganic porous substrates are prepared from conventional ceramic processes such as slip-casting, [33,34] extrusion, [35,36] dry pressing, [37] tapecasting, [38][39][40] and phase inversion hollow fibers.…”

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confidence: 99%

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Manufacture of Highly Porous Tubular Alumina Substrates with Anisotropic Pore Structure by Freeze‐Casting

et al. 2020

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Porous substrates play a major role in devices requiring the flow of fluids such as in filters and membranes. Porous substrates are also extensively used for the preparation of inorganic membranes for microfiltration, [1][2][3] desalination, [4][5][6][7] gas separation, [8][9][10][11] and percrystallization processes. [12,13] These inorganic membranes are known as asymmetric membranes as they are conventionally prepared by coating ceramic [14][15][16] or carbon [17][18][19] thin films as top layers on porous substrates. The importance of the porous substrate is to provide the mechanical strength otherwise not available in thin films. Many inorganic materials such as ceramics [20][21][22] and stainless steel [23][24][25] have been manufactured as porous substrates, though alumina is the most used material due to lower costs and processing versatility. Porous substrates come in several geometries such as tubes, [14,[26][27][28] hollow fibers, [29][30][31] and flat surfaces. [19,32] Traditionally, inorganic porous substrates are prepared from conventional ceramic processes such as slip-casting, [33,34] extrusion, [35,36] dry pressing, [37] tapecasting, [38][39][40] and phase inversion hollow fibers. [41,42] A relatively more recent method is the freeze-casting technique for processing porous ceramic substrates. [43][44][45][46] Due to the ability of forming an aligned pore structure, this technique can overcome problems associated with lower fluid fluxes conferred by conventional ceramic processing methods such as tortuous pore structure, constrictions, and dead-end and isolated pores. [47] Freeze-cast starts with the preparation of a stable ceramic suspension (or slurry) at normal conditions followed by controlled freezing of the solvent of the ceramic

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Manufacture of Highly Porous Tubular Alumina Substrates with Anisotropic Pore Structure by Freeze‐Casting

et al. 2020

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“…The elastic modulus of YSZ-HFs calculated by porosity was higher that of the CHs, which indicated that the former can achieve higher strength. However, the fracture strength of YSZ-HFs was also influenced by the pore size and its degree of anisotropy. , Stress concentration severely occurred at anisotropic pores, and resulted in the crack initiation . Furthermore, the high porosity of YSZ-HFs could reduce the free energy expended in creating the new crack surfaces, favoring the crack propagation.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of a Novel Catalyst Reactor with Improved Strength and Catalytic Performance Used for Automotive Exhaust Treatment

Cai

Guo

Zhang³

et al. 2019

Ind. Eng. Chem. Res.

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Yttria-stabilized zirconia hollow fibers (YSZ-HFs) containing radial wall microchannels with one end opening on the inner surface were prepared, and robust reactor modules of YSZ-HFs for automotive emission were prepared by bundling fibers with cement glue. 100% open-cell ratio and the unique microstructure of the YSZ-HFs catalytic reactor facilitated deposition of LaMnO3 three-way catalysts. Compared with the commonly used cordierite (2MgO-2Al2O3-5SiO2) honeycombs (CHs), the YSZ-HFs improved the reducibility and sintering resistance of the attached catalyst film. Higher effective conversion of CO and NO was found in the YSZ-HFs samples in comparison to the CHs samples. Moreover, the YSZ-HFs samples achieving higher flexural strength (~135 MPa) can better preserve the mechanical properties and the integrity of the catalyst film after 200 thermal shock cycles at 900 °C, due to the small thermal mismatch between the YSZ-HFs and the catalysts, as well as the intrinsic merit of zirconia.

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“…de Wit et al [5] discussed the candidate methods, namely, three-point bending, four-point bending and diametrical compression tests to assess the mechanical strength of ceramic hollow fibre membranes. The same authors also examined the impact of the production methods on the mechanical performance of alumina porous hollow fibre membranes [6]. Lee et al [7] investigated potential use of alumina hollow fibre membranes for wastewater treatment in terms of different micro-structures, which may affect the permeability and mechanical performance of membranes.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of dynamic behaviour of porous media including micro-cracks by ordinary state-based peridynamics

Özdemir

Oterkus

Öterkuş

et al. 2021

Engineering with Computers

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Reliable evaluation of mechanical response in a porous solid might be challenging without any simplified assumptions. Peridynamics (PD) perform very well on a medium including pores owing to its definition, which is valid for entire domain regardless of any existed discontinuities. Accordingly, porosity is defined by randomly removing the PD interactions between the material points. As wave propagation in a solid body can be regarded as an indication of the material properties, wave propagation in porous media under an impact loading is studied first and average wave speeds are compared with the available reference results. A good agreement between the present and the reference results is achieved. Then, micro-cracks are introduced into porous media to investigate their influence on the elastic wave propagation. The micro-cracks are considered in both random and regular patterns by varying the number of cracks and their orientation. As the porosity ratio increases, it is observed that wave propagation speed drops considerably as expected. As for the cases with micro-cracks, the average wave speeds are not influenced significantly in random micro-crack configurations, while regular micro-cracks play a noticeable role in absorbing wave propagation depending on their orientation as well as the number of crack arrays in y-direction.

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The effect of the production method on the mechanical strength of an alumina porous hollow fiber

Cited by 8 publications

References 29 publications

Manufacture of Highly Porous Tubular Alumina Substrates with Anisotropic Pore Structure by Freeze‐Casting

Manufacture of Highly Porous Tubular Alumina Substrates with Anisotropic Pore Structure by Freeze‐Casting

Fabrication of a Novel Catalyst Reactor with Improved Strength and Catalytic Performance Used for Automotive Exhaust Treatment

Evaluation of dynamic behaviour of porous media including micro-cracks by ordinary state-based peridynamics

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