Simulation of shrinkage during sintering of additively manufactured silica green bodies

Kakanuru, Padmalatha; Pochiraju, Kishore

doi:10.1016/j.addma.2022.102908

Cited by 4 publications

(4 citation statements)

References 21 publications

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“…In general, the printed specimens have an orthotropic type of anisotropy due to similar sintering behaviors in the two axes of the layer and only a different behavior in the building direction. This orthotropic behavior has been evidenced experimentally by triaxial dilatometry showing sintering shrinkage differences only in the building direction and by microscopy analysis showing architected microstructure containing a higher porosity in the interlayer zone [29][30][31]. This sintering shrinkage orthotropic behavior has been observed also in other additive manufacturing methods such as robocasting [32], fuse deposition modeling [33,34] or binder jetting [35,36].…”

Section: Introductionmentioning

confidence: 52%

“…In general, this approach assumes a mechanistic model with equivalent ellipsoidal porosity or grains to justify different directional driving forces [42,44]. Another approach applies the anisotropy directly at the level of the strain rate [31]. Finally, it is possible to apply the anisotropy at the level of the shear and bulk viscosities [29,32,45] which imply anisotropic porous skeleton.…”

Section: Anisotropic Pressureless Sintering Model Identificationmentioning

confidence: 99%

“…The modeling [27,28] of the lattice resistance to the sintering stage is then of key importance for the conception of thin structures. In addition, the ceramic stereolithography specimens have layered structures implying anisotropic sintering shrinkage and weaker material resistance between the layers where higher porosity is present [29][30][31]. The sintering model of the printed lattices should then account both the densification behavior (in temperature) and the anisotropic behavior of the porous specimen having more compaction in the building direction [29].…”

Section: Introductionmentioning

confidence: 99%

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Sintering behavior of ultra-thin 3D printed alumina lattice structures

Manière

Harnois

2023

Acta Materialia

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Section: Introductionmentioning

confidence: 52%

Section: Anisotropic Pressureless Sintering Model Identificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sintering behavior of ultra-thin 3D printed alumina lattice structures

Manière

Harnois

2023

Acta Materialia

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“…Mani'ere et al [23] use the SOVS (Skorohod-Olevsky Viscous Sintering) model to conduct finite element modeling analysis of a printed cup and predict the sintering shrinkage of samples with complex geometric shapes. Kakanuru et al [24] implemented the SOVS model as a custom creep model in finite element software, and determined the required parameters of the SOVS model by minimizing the error between the experimental and simulated relative densities. The dimensional variation of additive-manufactured green bodies during sintering was analyzed.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Physical Fields during Spark Plasma Sintering of Boron Carbide

et al. 2023

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Spark plasma sintering is a new technology for preparing ceramic materials. In this article, a thermal-electric-mechanical coupled model is used to simulate the spark plasma sintering process of boron carbide. The solution of the thermal-electric part was based on the charge conservation equation and the energy conservation equation. A phenomenological constitutive model (Drucker-Prager Cap model) was used to simulate the densification process of boron carbide powder. To reflect the influence of temperature on sintering performance, the model parameters were set as functions of temperature. Spark plasma sintering experiments were conducted at four temperatures: 1500 °C, 1600 °C, 1700 °C, and 1800 °C, and the sintering curves were obtained. The parameter optimization software was integrated with the finite element analysis software, and the model parameters at different temperatures were obtained through the parameter inverse identification method by minimizing the difference between the experimental displacement curve and the simulated displacement curve. The Drucker-Prager Cap model was then incorporated into the coupled finite element framework to analyze the changes of various physical fields of the system over time during the sintering process.

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Glazing of 3D-Printed Silica to Reduce Surface Roughness and Permeability

Åkerfeldt,

Thornell

2023

J. of Materi Eng and Perform

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The advantages that 3D printing brings to the development and production of customized structures make it suitable for use in the space industry, since spacecraft components are rarely produced in large series. This work explores the use of stereolithography printing of a silica resin for microfluidic applications, in particular small-scale microthrusters, where an impermeable high-temperature material with a smooth surface is required. The printing accuracy, firing shrinkage, surface roughness and permeability of 3D-printed ceramic samples were investigated. Furthermore, glazing of the ceramic material with a stoneware glaze was performed and evaluated with respect to its effect on surface roughness and gas permeability. Open microchannels with diameter down to 250 µm were obtained. However, the accuracy was poor. Surface roughness (Sa) of the unglazed material was between 2.4 and 20 µm in green state and 4.2-16 µm after firing, depending on the layer thickness and printing angle of the sample. Half of the unglazed samples were permeable, owing to porous areas at the interfaces between the printed layers. Two glazing methods were investigated: dip coating and airbrushing. For the latter, two amounts of coatings were explored. Dip coating and airbrushing with the larger amount of coatings resulted in uniform and smooth glaze layers. The smoothest surfaces, with Sa less than 0.2 µm, were obtained using airbrushing. Glazing made all samples impermeable, no matter the method used. Finally, the potential of the material in the suggested application was demonstrated through operation of a printed and glazed microthruster nozzle.

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Simulation of shrinkage during sintering of additively manufactured silica green bodies

Cited by 4 publications

References 21 publications

Sintering behavior of ultra-thin 3D printed alumina lattice structures

Sintering behavior of ultra-thin 3D printed alumina lattice structures

Numerical Simulation of Physical Fields during Spark Plasma Sintering of Boron Carbide

Glazing of 3D-Printed Silica to Reduce Surface Roughness and Permeability

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