Critical inclusion size prediction in refractory ceramics via finite element simulations

Luchini, Bruno; Sciuti, Vinicius Fiocco; Angélico, Ricardo Afonso; Canto, Rodrigo Bresciani; Pandolfelli, V. C.

doi:10.1016/j.jeurceramsoc.2016.08.008

Cited by 8 publications

(13 citation statements)

References 22 publications

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“…The numerical simulation procedure followed the model material approach in order to investigate the effective Young's modulus behavior as a function of temperature of carbon‐bonded alumina. For that purpose, Franklin and Tucker suggested a theory that was complemented by Werner et al, where the increase in the effective Young's modulus with the temperature is a consequence of the closure of gaps between the particles and the matrix, which is related to the thermal expansion mismatch of the phases.…”

Section: Methodsmentioning

confidence: 99%

“…Many authors applied the concept of model materials to understand the unusual behavior of complex composites . Model materials are simplified composites with, for instance, just two phases and well‐defined geometries and properties.…”

Section: Introductionmentioning

confidence: 99%

“…Many authors applied the concept of model materials to understand the unusual behavior of complex composites. 3,[18][19][20] Model materials are simplified composites with, for instance, just two phases and well-defined geometries and properties. This includes, among others, the volume fraction of particles, the particle size, and their distribution.…”

Section: Introductionmentioning

confidence: 99%

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On the nonlinear behavior of Young's modulus of carbon‐bonded alumina at high temperatures

et al. 2018

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The origin of the nonlinear behavior of the Young's modulus (E) of carbon‐bonded alumina at high temperatures was addressed, based on the microstructural changes observed during processing and their thermo‐mechanical properties. Impulse excitation technique, thermogravimetric analysis, porosity measurement, and scanning electron microscopy were conducted in order to highlight and explain the E behavior. The finite element model of a virtual microstructure was simulated and the results attained are in good agreement with the experimental data. The tests revealed that the Young's modulus of a cured sample heated from room temperature up to 500°C was governed by the release of volatiles. Above this temperature, the thermal expansion mismatch among alumina, graphite, and the carbon matrix is dominant resulting in an increase in the effective Young's modulus. During cooling, crack networks and gaps between alumina particles and the carbon matrix were developed. The former were induced by volatile release and by the graphite's highly anisotropic thermal expansion. The latter was derived by the thermal expansion mismatch between the alumina and the carbon matrix. The closure of the gaps and cracks governed the expansion behavior during the second heating cycle and a nonlinear effective Young's modulus increase as a function of temperature was observed.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the nonlinear behavior of Young's modulus of carbon‐bonded alumina at high temperatures

et al. 2018

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“…Selsing deduced a very useful Equation to represent the force systems generated in and around a spherical crystal embedded in a continuous glassy phase by an ingenious model, where subscripts 1 and 2 refer to the second phase particles and matrix, and p , ∆ α, ∆T , v , and E are the pressure present around the second phase particles, difference in thermal expansion coefficient, temperature range over which stresses are not relieved, Poisson's ratio, and elastic modulus, respectively. It has become a fundamental formula in calculating and simulating the stresses caused by different thermal expansion coefficients between second phase particles and matrix

p = \frac{Δ α \cdot Δ T}{\frac{1 - 2 v_{1}}{E_{1}} + \frac{(1 + v_{2})}{2 E_{2}}}

…”

Section: Introductionmentioning

confidence: 99%

“…It has become a fundamental formula in calculating and simulating the stresses caused by different thermal expansion coefficients between second phase particles and matrix. [10][11][12][13][14][15]…”

Section: Introductionmentioning

confidence: 99%

Stress distribution around Fe₅Si₃ and its effect on interface status and mechanical properties of Si₃N₄ ceramics

Wang

et al. 2017

J Am Ceram Soc

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Si3N4 ceramics with different amount of Fe5Si3 were prepared by adding FeSi2. Residual thermal stress distribution and elastic energy around Fe5Si3 particles in various depths were calculated. The interface status between second phase particles and matrix was analyzed in terms of stress and energy. High tangential compressive stresses and low radial tensile stresses were generated along the surface of the ceramics. Elastic strain energy caused by unit interface was high around big particles in deep area of the ceramics. Microcracks are observed around the big Fe5Si3 particles. Furthermore, accord to our calculation, microcracks are easily generated around particles in superficial layer of matrix when second phase particles have lower thermal expansion coefficient than the matrix, while microcracks tend to be generated in deep layer of matrix preferentially when the thermal expansion coefficient of second phase particles is higher than matrix. Residual stresses and microcracks around Fe5Si3 particles greatly influenced mechanical properties. Fracture toughness of Si3N4 ceramics with similar Si3N4 particle size distribution increased with the amount of Fe5Si3, and fine Fe5Si3 particles could enhance the strength of Si3N4 ceramics. Si3N4 ceramics exceeding 1.2 GPa strength were prepared.

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Influence of New Glass Phase Structure on the Mechanical Properties of Composite Ceramic SiC/Si₃N₄

Wang

Zhou

Liu

2023

Physica Status Solidi (a)

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Though the addition of a second phase is an effective method for toughening silicon nitride (Si3N4) ceramics, certain residual thermal stress is generated at the phase interface. In case of a large value of residual thermal stress, a weak interface forms between the second phase and the matrix material, reducing the strength of the material. Herein, a new type of core–shell structure silicon carbide SiC–glass phase is produced inside the material by adding a presintering process into the traditional SiC–Si3N4 sintering process. The radial and tangential thermal stresses around the core–shell structural SiC–glass phase and SiC particle are compared by using the finite element method. The results indicate that the core–shell structural SiC–glass phase inhibits the interfacial debonding. Compared with the introduction of SiC particle alone, the core–shell structural SiC–glass phase optimizes the mechanical properties of SiC/Si3N4 composite ceramic, with the fracture toughness reduced by 9.6%, the bending strength increased by 12.3%, and the friction coefficient reduced by 8.5% for the SiC/Si3N4 ceramics with SiC content of 5%.

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Critical inclusion size prediction in refractory ceramics via finite element simulations

Cited by 8 publications

References 22 publications

On the nonlinear behavior of Young's modulus of carbon‐bonded alumina at high temperatures

On the nonlinear behavior of Young's modulus of carbon‐bonded alumina at high temperatures

Stress distribution around Fe₅Si₃ and its effect on interface status and mechanical properties of Si₃N₄ ceramics

Influence of New Glass Phase Structure on the Mechanical Properties of Composite Ceramic SiC/Si₃N₄

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Critical inclusion size prediction in refractory ceramics via finite element simulations

Cited by 8 publications

References 22 publications

On the nonlinear behavior of Young's modulus of carbon‐bonded alumina at high temperatures

On the nonlinear behavior of Young's modulus of carbon‐bonded alumina at high temperatures

Stress distribution around Fe5Si3 and its effect on interface status and mechanical properties of Si3N4 ceramics

Influence of New Glass Phase Structure on the Mechanical Properties of Composite Ceramic SiC/Si3N4

Contact Info

Product

Resources

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Stress distribution around Fe₅Si₃ and its effect on interface status and mechanical properties of Si₃N₄ ceramics

Influence of New Glass Phase Structure on the Mechanical Properties of Composite Ceramic SiC/Si₃N₄