Effect of porosity of cordierite preforms on microstructure and mechanical strength of co-continuous ceramic composites

Pavese, Matteo; Valle, Massimiliano; Badini, Claudio Francesco

doi:10.1016/j.jeurceramsoc.2006.05.080

Cited by 33 publications

(11 citation statements)

References 33 publications

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“…It is evident that porosity has a very strong effect on the properties of the composites. In particular, Young's modulus, flexural strength and thermal conductivity increase with decreasing porosity [38,39]. Porosity appears to be detrimental for crack propagation.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Porosity in a Laser Sintered MMCp Using X-Ray Synchrotron Phase Contrast Microtomography

Girardin¹,

Renghini²,

Dyson³

et al. 2011

MSA

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Direct Laser Sintering (DSL), a technology enabling the production of dense metal components directly from 3D CAD data, was used for the first time to produce a Metal Matrix Composite (MMCp) based on Al-Si-Cu alloy in view of its application in different fields, in particular for aeronautics. The porosity of the material obtained so was investigated by using optical and electron microscopy and, in particular, X-ray computed microtomography techniques. DSL is a unique technique to produce complex components in an economical way while computed microtomography is a unique technique to evaluate the porosity and pore and cracks distribution in a not destructive way. A near homogeneous distribution of the porosity and pore sizes was observed both comparing different regions of the same specimen and also by comparing different samples obtained by using the same DLS production method. A quantitative analysis of the damage in the composite is also reported

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Section: Introductionmentioning

confidence: 99%

“…Good mechanical properties and a good corrosion resistance are required for such applications. The microstructure and, in particular, the porosity play a fundamental role for those aims [38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Porosity in a Laser Sintered MMCp Using X-Ray Synchrotron Phase Contrast Microtomography

Girardin¹,

Renghini²,

Dyson³

et al. 2011

MSA

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“…Following a cold axial pressing method, a hand press was used to compress the powder in a mold that was manufactured using a high strength 4140 steel. To make the porous structure, 99.99% graphite (caught between 100 mesh and 300 mesh, 496588, Sigma‐Aldrich, Oakville, ON) was mixed into the alumina powder at a specific weight percent 19–21…”

Section: Methodsmentioning

confidence: 99%

“…Images having at least two pores greater than 10 μm (smallest pore size) were selected for sampling. Pore volume was measured hydrostatically using distilled water on six discs as in Pavese et al21 Density of the alumina powder was assumed to be 3.96 kg M −3 . The final average pore size in the apparently open structure was 32.8 ± 15.4 μm with an associated 35% porosity [Figure 1(c)].…”

Section: Methodsmentioning

confidence: 99%

Lamination for subdermal implant fixation

et al. 2009

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Thirty-six aluminum oxide laminated discs were implanted into 12 young rabbits (18 with a 0.5-mm porous layer and 18 with 1 mm) to determine whether implants that are porous only on one side could fixate to subcutaneous tissue. After 3 months, discs were encased within thin pouches (0.02-0.14 mm) of fibrous connective tissue, as would have been expected of a completely porous implant. Solid sides showed no, while the porous sides showed little, attachment to pouches. Forty-seven percentage (17) of the discs had moved 1.4 +/- 0.8 cm beyond the 4.7 + 1 cm they had moved due to normal skin growth, while two others had moved between 6.2 and 6.5 cm beyond this measure. The proportion of 1 mm porous layer discs migrating within subcutaneous tissue was no greater than the proportion of 0.5 mm layer discs migrating (p = 0.15). Porous layer height and disc migration did not affect the attachment strength of pouch to surrounding tissues (68 +/- 23 N, p = 0.34). Pouch thickness, which has been associated to the level of applied forces in other studies, increased with migration distance (p = 0.054). Results indicate that one-sided porous discs are likely easier to retrieve than completely porous ones, but cannot be prevented from migrating in loose tissue of young animals. Data is being used to design subdermal radio frequency devices for endangered marine animals.

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“…Also, a lot of works make use of finite element methods or other computational techniques based on meshing or space-partitioning procedures [Feng et al 2003;Chen et al 2008]. Numerical homogenization techniques provide as well relevant estimates applicable to various effective properties [Roberts and Garboczi 2002;Delannay et al 2006;Pavese et al 2007]. …”

Section: Patrick Franciosi Renald Brenner and Abderrahim El Omrimentioning

confidence: 99%

Effective property estimates for heterogeneous materials with cocontinuous phases

Franciosi

Brenner

Omri

2011

J. Mech. Mater. Struct.

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This work concerns heterogeneous multiphase materials which may exhibit omnidirectional full or partial cocontinuity of several or all phases. The estimate of their effective (mechanical or physical) properties is not yet well handled as compared to those for well-defined aggregate or reinforced-matrix structures, especially in the context of homogenization methods. We propose in this framework a modeling scheme which aims at accounting for such phase cocontinuity features. In the mechanical application field, the modeling validity restricts to elastic properties of unloaded materials or in load situations as far as bending and torsion effects of possibly strut-like phase parts are not essential. For other physical properties (dielectric, magnetic, etc.), the modeling applications concern those for which homogenization approaches are relevant. The modeling is based on a material's morphology description in terms of a generalization of so-called "fiber systems" that were introduced in early literature reports. Using parameters that describe the clustering characteristics of the individual phases and of their assemblage, we have considered these fiber systems both within a layer-based approach of the material structure and within an aggregate-like one. By these two routes, we have obtained two estimate forms that differ only slightly in definition. The presentation uses the elasticity formalism, in simple cases of isotropic mixtures of two-phase materials with isotropic phase behavior but the modeling extends to n-phase anisotropic materials as established separately. Our estimates are compared with basic variational bounds and homogenization estimates, with some literature data and with homogenization results obtained with the fast Fourier transform approach on numerical structures. All data are matched with different parameter sets corresponding to different types of phase organization. The two estimates remain nearly equal for all of the examined structures regardless of phase contrast and with only slight differences consistent with their definition difference.

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Effect of porosity of cordierite preforms on microstructure and mechanical strength of co-continuous ceramic composites

Cited by 33 publications

References 33 publications

Characterization of Porosity in a Laser Sintered MMCp Using X-Ray Synchrotron Phase Contrast Microtomography

Characterization of Porosity in a Laser Sintered MMCp Using X-Ray Synchrotron Phase Contrast Microtomography

Lamination for subdermal implant fixation

Effective property estimates for heterogeneous materials with cocontinuous phases

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