Experiment and modeling on the compressive behaviors for porous silicon nitride ceramics

Lu, Zixing; Liu, Qiang; Han, Hao; Zhang, Dahai

doi:10.1016/j.msea.2012.08.081

Cited by 32 publications

(16 citation statements)

References 41 publications

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“…Figure 4 compares the compressive strength in the SN-1 sample and other highly porous Si 3 N 4 ceramics reported in the literature [9–11, 23]. These foams were prepared by conventional sintering at >1600 °C with dwelling time being hours, and the mechanical strength was measured in terms of flexural or compressive strength.…”

Section: Resultsmentioning

confidence: 99%

“…Sintering of silicon nitride often encounters a difficulty related to its easy disassociation at the high temperatures necessary for sintering [7, 8]. This difficulty appears more critical when conventional pressureless sintering techniques are of concern, because they require elevated temperatures (> 1800 °C) and prolonged dwelling time (a few hours) for sufficient densification to occur [9–11]. In order to overcome this difficulty, advanced sintering techniques such as spark plasma sintering (SPS) [12, 13] and microwave sintering [14, 15], have been employed to sinter the silicon nitride family of ceramics.…”

Section: Introductionmentioning

confidence: 99%

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Rapid sintering of silicon nitride foams decorated with one-dimensional nanostructures by intense thermal radiation

Moraes

Guo

et al. 2014

Science and Technology of Advanced Materials

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Silicon nitride foams were prepared by direct foaming and subsequent rapid sintering at 1600 °C. The intense thermal radiation generated under the pressureless spark plasma sintering condition facilitated necking of Si3N4 grains. The prepared foams possessed a porosity of ∼80 vol% and a compressive strength of ∼10 MPa, which required only ∼30 min for the entire sintering processes. Rapid growth of one-dimensional SiC nanowires from the cell walls was also observed. Thermodynamic calculations indicated that the vapor–liquid–solid model is applicable to the formation of SiC nanowires under vacuum.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rapid sintering of silicon nitride foams decorated with one-dimensional nanostructures by intense thermal radiation

Moraes

Guo

et al. 2014

Science and Technology of Advanced Materials

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“…7c). It was stated [48,49] that the averaged properties tended to converge when the amount of numerical samples is large enough, assessed by a tendency of a relative error of mean value (REMV) according to the following expressions:…”

Section: Representative Volume Elementmentioning

confidence: 99%

Assessing stiffness of nanofibres in bacterial cellulose hydrogels: Numerical-experimental framework

Gao

Sozumert

Shi

et al. 2017

Materials Science and Engineering: C

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This work presents a numerical-experimental framework for assessment of stiffness of nanofibres in a fibrous hy-drogel -bacterial cellulose (BC) hydrogel -based on a combination of in-aqua mechanical testing, microstructur-al analysis and finite-element (FE) modelling. Fibrous hydrogels attracted growing interest as potential replacements to some tissues. To assess their applicability, a comprehensive understanding of their mechanical response under relevant conditions is desirable; a lack of such knowledge is mainly due to changes at microscale caused by deformation that are hard to evaluate in-situ because of the dimensions of nanofibres and aqueous en-vironment. So, discontinuous FE simulations could provide a feasible solution; thus, properties of nanofibres could be characterised with a good accuracy. An alternative -direct tests with commercial testing systems -is cumbersome at best. Hence, in this work, a numerical-experimental framework with advantages of convenience and relative easiness in implementation is suggested to determine the stiffness of BC nanofibres. The obtained magnitudes of 53.7-64.9 GPa were assessed by calibrating modelling results with the original experimental data.

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“…It should be noted, that strong enough contact between the fibers and present foreign inclusions is realized in the course of synthesis since, apparently, the fiber material is settled out of the gas phase. Consequently, in the calculations process we anticipate a perfect connection of the fibers together and the fibers with the inclusion without introduction of the additional contacts [14,15]. When this happens, we must perform calculations on the three-dimensional solid-models without involvement of the core models, as it was done in papers [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, in the calculations process we anticipate a perfect connection of the fibers together and the fibers with the inclusion without introduction of the additional contacts [14,15]. When this happens, we must perform calculations on the three-dimensional solid-models without involvement of the core models, as it was done in papers [14,15]. Thus, the models of the fragments used and the calculation process directly become complicated.…”

Section: Introductionmentioning

confidence: 99%

NUMERICAL MODELING OF RESIDUAL THERMAL STRESS IN Si$_{3}$N$_{4}$ BASED HIGH-POROUS COMPOSITE CERAMICS

Rabinskiy¹

2016

Int. J. of Pure and Appl. Math.

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Abstract:Modeling of residual thermal stresses arising in silicon nitride-based porous fibrous ceramic materials with reinforcing dispersed inclusions was carried out. Calculations were made within quasi-static linear thermoelasticity on the presumption that the initial state at which there are no internal stresses in the media is realized during synthesis of the material at temperature of 1450 • C. Modeling was carried out on three-dimensional representative fragments of fibrous structures generated using random algorithms with preset parameters of the materials' microstructure. Influence of the volume fraction and the size of the fillers in the form of spherical inclusions of silicon carbide on the residual thermal stresses realized within the structure of fibrous porous material is analyzed. It is demonstrated that the level of arising residual stresses can be comparable and, indeed, may exceed the fracture strength of considered porous materials.

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Experiment and modeling on the compressive behaviors for porous silicon nitride ceramics

Cited by 32 publications

References 41 publications

Rapid sintering of silicon nitride foams decorated with one-dimensional nanostructures by intense thermal radiation

Rapid sintering of silicon nitride foams decorated with one-dimensional nanostructures by intense thermal radiation

Assessing stiffness of nanofibres in bacterial cellulose hydrogels: Numerical-experimental framework

NUMERICAL MODELING OF RESIDUAL THERMAL STRESS IN Si$_{3}$N$_{4}$ BASED HIGH-POROUS COMPOSITE CERAMICS

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