Relação entre porosidade e os módulos elásticos de esponjas cerâmicas produzidas via "gelcasting"

Rodrigues, J. A.; Ortega, Fernando dos Santos; Paiva, António; Villaboim, E. L. G.; Pandolfelli, V. C.

doi:10.1590/s0366-69132004000300007

Cited by 10 publications

(9 citation statements)

References 19 publications

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“…For instance, Rodrigues et al [71] compared experimental data of the elastic moduli of Al 2 O 3 foams (P: 60-90%) to several models proposed in the literature, as depicted in Figure 15. These authors considered the Al 2 O 3 foams as isotropic material and, therefore, the experimental data fitted well with the MacKenzie [68] and Gibson and Ashby (GA) [22,23] models.…”

Section: Recent Advances In Porous Ceramicsmentioning

confidence: 99%

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Mechanical Properties of Porous Ceramics

Salvini¹,

Pandolfelli²,

Spinelli³

2018

Recent Advances in Porous Ceramics

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It is widely known that increasing interest in porous ceramics is due to their special properties, which comprise high volumetric porosity (up to 90%) with open or closed pores, and a broad range of pore sizes (micropores: d < 2 nm; mesopores: 50 nm > d > 2 nm and macropores: d > 50 nm). These properties have many uses comprehending macroscaled devices, mesoscaled materials and microscaled pieces. During their usage, these materials are usually submitted to thermal and/or mechanical loading stresses. Therefore, it is a premise to understand how these porous structures behave under thermomechanical stresses to design materials that show adequate properties for the required application. In this context, the aim of this chapter is to review the mechanical properties of macroporous ceramics.

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Section: Recent Advances In Porous Ceramicsmentioning

confidence: 99%

“…Theoretical models predicting the effect of porosity on the relative Young's modulus (continuous lines) and experimental data of gelcasting Al 2 O 3 foams[71].…”

mentioning

confidence: 99%

Mechanical Properties of Porous Ceramics

Salvini¹,

Pandolfelli²,

Spinelli³

2018

Recent Advances in Porous Ceramics

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“…The relative densities of the green samples and sintered samples were calculated according to the ratio between the apparent density, as measured by immersion in mercury (Archimedes' principle) at 20 °C, and the theoretical density of the solids, as determined by pycnometry. From the values of the apparent density (ρ a ) and theoretical density of the solids (ρ s ), the porosity (ε) of each body was determined according to Equation 3 [30] :…”

Section: Physical Characterizationmentioning

confidence: 99%

Structural and fluid dynamic characterization of calcium carbonate-based porous ceramics

et al. 2013

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The aim of this work was to experimentally evaluate the use of calcium carbonate as a poregenerating agent in ceramic compositions. Compositions that contained 50% kaolin, 20% limestone, and different concentrations of quartz and feldspar were prepared by uniaxial pressing. Samples were heat-treated at a heating rate appropriate to induce calcium carbonate degassing, and they were then sintered at 800, 900, and 1050 °C. Tests of X-ray fluorescence, thermogravimetric analysis, porosimetry, and air permeation were performed. The composition (wt%) that contained 50% kaolin, 20% limestone, 20% feldspar, and 10% quartz and heat treated at 1050 °C (k 1 = 1.73×10 -13 m 2 and k 2 = 1.00×10 -8 m) showed the highest level of permeability among the investigated samples. Fluid dynamics simulations showed that the prepared samples would exhibit a pressure drop greater than the range desired for applications that involve the filtration of aerosols, but alternatively would be suitable as substrates for asymmetric membranes in microfiltration applications.

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“…Thus, porous ceramics generally have lower mechanical resistance when compared to dense ceramics. Therefore, their applications are different and can not be used as structural materials [7,8]. The main properties of porous ceramics are low thermal conductivity, low density, high surface area, high permeability and high refractoriness [9].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of mechanical properties of porous alumina ceramics obtained using rice husk as a porogenic agent

et al. 2019

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The objective of this work was to evaluate the mechanical properties of porous alumina ceramics, using the rice husk as a porogenic element. The rice husk was milled and graded in two granulometry, <65 μm and 65-150 μm, and added in a high purity calcined alumina in the proportion of 5, 15 and 30 wt%. The samples were pressed by uniaxial pressing and sintered at 1450 ºC for 1 h. Sintered density, total porosity, Young's modulus, modulus of rupture, and compressive strength were evaluated. Samples were also prepared without the addition of rice husk (RH) in order to compare the properties. Porous ceramics with total porosity ranging from 24% to 54% were produced, and with the composition of 5% RH 65-150 μm, a high porosity value was obtained for a lower loss in mechanical properties.

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Relação entre porosidade e os módulos elásticos de esponjas cerâmicas produzidas via "gelcasting"

Cited by 10 publications

References 19 publications

Mechanical Properties of Porous Ceramics

Mechanical Properties of Porous Ceramics

Structural and fluid dynamic characterization of calcium carbonate-based porous ceramics

Evaluation of mechanical properties of porous alumina ceramics obtained using rice husk as a porogenic agent

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