Numerical simulation of sintering for 3D-printed ceramics via SOVS model

Safonov, Alexander; Chugunov, Svyatoslav; Тихонов, А. А.; Gusev, M. P.; Akhatov, Iskander

doi:10.1016/j.ceramint.2019.06.144

Cited by 21 publications

(12 citation statements)

References 39 publications

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“…The authors [42] investigated porosity evolution as a function of sintering temperature and developed a preliminary predictive numerical model for 3D printed ceramic shrinkage. For the porosity range investigated in [42], there were two terminal values of permeability determined in this study (schematically shown with red circles in Figure 13), which determine the minimal and maximal values of permeability achievable with the studied material. The porosity curve in Figure 13 does not account for dwell values, while the shown permeability values do.…”

Section: Discussionmentioning

confidence: 99%

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Towards Creation of Ceramic-Based Low Permeability Reference Standards

et al. 2019

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Low-permeable materials, either artificial or natural, are essential components of the current technological development. Their production or processing requires a comprehensive characterization method based on confident reference standards. Permeability standards for values below 10−15 m2 are lacking. In this study, we explored the feasibility of using the ceramic sintering process to reach low, but measurable values of gas permeability in Al2O3 samples, as one of the potential materials for reference standards. The studied samples were produced with a ceramic 3D printer, which enables the manufacturing of low-permeable samples having complex geometrical arrangements. A series of preliminary laboratory testing indicated the available gas permeability range from 2.4 × 10−15 m2 for the pre-sintered samples to 1.8 × 10−21 m2 for the sintered samples. The verification of the permeability reduction was carried out using a unique unsteady state fast and accurate measurement method. The results confirm the possibility of developing a technology for materials manufacturing with low porosity and permeability. Such materials open many areas for application, including manufacturing of ceramics with controlled transport properties and low-permeability standards for calibrating laboratory equipment for geosciences, construction industries, biomedical, and other relevant fields.

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Section: Discussionmentioning

confidence: 99%

“…The values shown in solid red are the terminal values of permeability measured in this study—to identify the available range. A complete curve (schematically shown with dashed red circles) is required to accurately model permeability evolution during sintering (the porosity data were originally presented in [42]).…”

Section: Figurementioning

confidence: 99%

Towards Creation of Ceramic-Based Low Permeability Reference Standards

et al. 2019

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“…The majority of the particles have a size of 0.5–2 µm. A rare occurrence of large particles (up to ~5 µm) is observed in the paste [ 19 ].…”

Section: Methodsmentioning

confidence: 99%

“…There are multiple attempts in the scientific community to study the fundamental aspects of the described problems and to optimize the manufacturing approaches targeting for defect-free technical ceramics. Among those, a series of experimentation [ 14 , 15 , 16 , 17 , 18 ] and advanced numerical modeling [ 19 , 20 , 21 , 22 ]. The development of numerical models for simulation of ceramic-related physical processes is closely related to the material’s microstructure.…”

Section: Introductionmentioning

confidence: 99%

Evolution of SLA-Based Al2O3 Microstructure During Additive Manufacturing Process

2020

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Evolution of additively manufactured (AM) ceramics’ microstructure between manufacturing stages is a hardly explored topic. These data are of high demand for advanced numerical modeling. In this work, 3D microstructural models of Al2O3 greenbody, brownbody and sintered material are presented and analyzed, for ceramic samples manufactured with SLA-based AM workflow, using a commercially available ceramic paste and 3D printer. The novel data, acquired at the micro- and mesoscale, using Computed Tomography (CT), Scanning Electron Microscopy (SEM) and Focused Ion-Beam SEM (FIB/SEM) techniques, allowed a deep insight into additive ceramics characteristics. We demonstrated the spatial 3D distribution of ceramic particles, an organic binder and pores at every stage of AM workflow. The porosity of greenbody samples (1.6%), brownbody samples (37.3%) and sintered material (4.9%) are analyzed. Pore distribution and possible originating mechanisms are discussed. The location and shape of pores and ceramic particles are indicative of specific physical processes driving the ceramics manufacturing. We will use the presented microstructural 3D models as input and verification data for advanced numerical simulations developed in the project.

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“…It is a visco-plastic model based on rheological sintering theory [5,6], modified for the use within continuum mechanics context [7]. The original model and its subsequent extensions and improvements have been successfully used for modeling of the sintering process [8,9].…”

Section: Introductionmentioning

confidence: 99%

Skorohod-Olevsky viscous sintering model sensitivity to temperature distribution during the sintering process

Petrovic¹,

Buljak²,

Cornaggia³

2021

FME Transactions

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This paper investigates the influence of temperature field non-uniformity on sintering simulation results using the Skorohod-Olevsky viscous sintering model. As a difference to previous studies, here a thermal transient analysis is performed to provide a detailed temperature field over the component within sintering time. Results obtained using uniform temperature distribution are compared to those obtained using a nonuniform distribution derived from a transient thermal analysis. Results are compared for different geometry sizes, that lead to different temperature non-uniformity levels. The study has shown that the temperature nonuniformity cannot always be neglected and should be considered as a possible source of modeling error.

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Numerical simulation of sintering for 3D-printed ceramics via SOVS model

Cited by 21 publications

References 39 publications

Towards Creation of Ceramic-Based Low Permeability Reference Standards

Towards Creation of Ceramic-Based Low Permeability Reference Standards

Evolution of SLA-Based Al2O3 Microstructure During Additive Manufacturing Process

Skorohod-Olevsky viscous sintering model sensitivity to temperature distribution during the sintering process

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