Image data analysis of high resolution μCT data for the characterization of pore orientation and pore space interconnectivity in freeze cast ceramics

Ilzig, Thomas; Schumacher, Daniel; Wilhelm, Michaela; Günther, Stefan; Odenbach, Stefan

doi:10.1016/j.matchar.2021.110966

Cited by 7 publications

(3 citation statements)

References 33 publications

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“…For samples with a higher solid loading, although the primary dendritic arms still have a greater influence on mass transfer within the pore structure due to their orientation in the direction of flow, the numerous secondary dendritic arms that grow from a primary dendrite often have a much larger pore volume [ 39 ]. These secondary pores are often not interconnected [ 41 ] and are perpendicular to the mass flow, thus representing an additional path for liquid flow and slowing it down during the phase separation. Moreover, the values of the bubble point diameter

were calculated using Equation (1) and the measured bubble point pressure.…”

Section: Resultsmentioning

confidence: 99%

SiOC Screens with Aligned and Adjustable Pore Structure for Screen Channel Liquid Acquisition Device

et al. 2023

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The development of porous ceramic screens with high chemical stability, low density, and thermal conductivity can lead to promising screen channel liquid acquisition devices (SC-LADs) for propellant management under microgravity conditions in the future. Therefore, SiOC screens with aligned pores were fabricated via freeze-casting and applied as a SC-LAD. The pore window sizes and open porosity varied from 6 µm to 43 µm and 65 % or 79 %, depending on the freezing temperature or the solid loading, respectively. The pore window size distributions and bubble point tests indicate crack-free screens. On the one hand, SC-LADs with an open porosity of 79 % removed gas-free liquid up to a volumetric flow rate of 4 mL s−1. On the other hand, SC-LADs with an open porosity of 65 % were limited to 2 mL s−1 as the pressure drop across these screens was relatively higher. SC-LADs with the same open porosity but smaller pore window sizes showed a higher pressure drop across the screen and bubble ingestion at higher values of effective screen area when increasing the applied removal volumetric flow rate. The removed liquid from the SC-LADs was particle-free, thus representing a potential for applications in a harsh chemical environment or broad-range temperatures.

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were calculated using Equation (1) and the measured bubble point pressure.…”

Section: Resultsmentioning

confidence: 99%

SiOC Screens with Aligned and Adjustable Pore Structure for Screen Channel Liquid Acquisition Device

et al. 2023

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“…The pore structure has been studied by many scholars using the above means. Using scanning electron microscopy, XRD, etc., the pore morphology and connectivity of coal rock bodies can be obtained visually [26][27][28][29]. However, the pore characteristic data observed by these methods are mainly used for qualitative characterization, and it is difficult to analyze quantitatively.…”

Section: Introductionmentioning

confidence: 99%

Joint Characterization and Fractal Laws of Pore Structure in Low-Rank Coal

Zhou

Bai

et al. 2023

Sustainability

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The pore structure of low-rank coal reservoirs was highly complex. It was the basis for predicting the gas occurrence and outburst disasters. Different scale pores have different effects on adsorption–desorption, diffusion, and seepage in coalbed methane. To study the pore structure distribution characteristics, which are in different scales of low-rank coal with different metamorphism grade, the pore structure parameters of low-rank coal were obtained by using the mercury injection, N2 adsorption, and CO2 adsorption. These three methods were used to test the pore volume and specific surface area of low-rank coal in their test ranges. Then, the fractal dimension method was used to calculate the fractal characteristics of the pore structure of full aperture section to quantify the complexity of the pore structure. The experimental results showed that the pore volume and specific surface area of low-rank coal were mainly controlled by microporous. The pore fractal characteristics were obvious. With the influence of coalification process, as the degree of coal metamorphism increases, fluctuations in the comprehensive fractal dimension, specific surface area, and pore volume of the pore size range occur within the range of Rmax = 0.50% to 0.65%.

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“…Basically, backscattered electrons carry much more information about the structure, e.g., crystallographic orientation or phase, so we are able to distinguish between grains or phases within the sample, identify interfaces, etc. [25,26] Different from micro-computed tomography (micro-CT), [10,27,28] EBSD allows determining effectively several microstructural parameters, such as grain geometry, particles and voids, grain-grain interfaces (boundary), grain morphology within particles or/and grains misorientation. Despite several advantages of the proposed methodology, EBSD investigation of sintered materials suffers also from a few limitations and deficiencies, such as the locally insufficient quality of the prepared sample surface (especially in the case of brittle and porous materials) and, hence, the several unsolved spots of the sample surface during the EBSD analysis, which may interfere the real representation of material microstructure.…”

Section: Introductionmentioning

confidence: 99%

Combined EBSD and Computer-Assisted Quantitative Analysis of the Impact of Spark Plasma Sintering Parameters on the Structure of Porous Materials

Nosewicz

Jurczak

Chromiński

et al. 2022

Metall Mater Trans A

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The paper presents the experimental, numerical, and theoretical investigation of the microstructure of nickel aluminide samples manufactured by spark plasma sintering using electron backscatter diffraction and computer assisted software. The aim of the work was to reveal the evolution of the microscopic and macroscopic parameters related to the microstructure of the material and its dependence on the applied sintering parameters—temperature and pressure. The studied porous samples with different relative density were extracted from various planes and then tested by electron backscatter diffraction to evaluate the crystallographic orientation in every spot of the investigated area. On this foundation, the grain structure of the samples was determined and carefully described in terms of the grain size, shape and boundary contact features. Several parameters reflecting the grain morphology were introduced. The application of the electric current resulting in high temperature and the additional external loading leads to the significant changes in the structure of the porous sample, such as the occurrence of lattice reorientation resulting in grain growth, increase in the grain neighbours, or the evolution of grain ellipticity, circularity, grain boundary length, and fraction. Furthermore, the numerical simulation of heat conduction via a finite element framework was performed in order to analyse the connectivity of the structures. The numerical results related to the thermal properties at the micro- and macroscopic scale—local heat fluxes, deviation angles, and effective thermal conductivity—were evaluated and studied in the context of the microstructural porosity. Finally, the effective thermal conductivity of two-dimensional EBSD maps was compared with those obtained from finite element simulations of three-dimensional micro-CT structures. The relationship between the 2D and 3D results was derived by using the analytical Landauer model.

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Image data analysis of high resolution μCT data for the characterization of pore orientation and pore space interconnectivity in freeze cast ceramics

Cited by 7 publications

References 33 publications

SiOC Screens with Aligned and Adjustable Pore Structure for Screen Channel Liquid Acquisition Device

SiOC Screens with Aligned and Adjustable Pore Structure for Screen Channel Liquid Acquisition Device

Joint Characterization and Fractal Laws of Pore Structure in Low-Rank Coal

Combined EBSD and Computer-Assisted Quantitative Analysis of the Impact of Spark Plasma Sintering Parameters on the Structure of Porous Materials

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