首页|Structural effect on the plastic behavior in highly porous glasses

Structural effect on the plastic behavior in highly porous glasses

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  • NETL
  • NSTL
  • Trans Tech Publications Ltd
Silica aerogels have been studied with the objective of understanding the mechanical behavior of these extremely porous (pore volume higher than 85%) glassy materials. Elastic and plastic behaviors are investigated using Hg porosimetry. Because of the peculiar structure of these materials, Hg liquid cannot enter their porous network and consequently induces an isostatic pressure. Due to the high compliance of the solid network, under isostatic pressure aerogels display an irreversible shrinkage caused by plastic deformation. The magnitude of the plastic shrinkage and the increase of the associated mechanical properties depend on the different parameters (porosity, elastic properties and structural features). The structural features are followed by X Rays scattering. The irreversible compaction can be explained by siloxane bond formation between clusters constituting the porous materials, retaining the strained structure. The pore collapse mechanism is favored by the large pores structure and loose cluster structure (low fractal dimension). This densification process could offer a new way to synthesize porous glasses at room temperature.

porous glassesaerogelselastic propertiesplastic behaviourSAXS

T. Woignier、A. Hafidi Alaoui、J. Primera、J. Phalippou、G. W. Scherer

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UR Seqbio IRD-PRAM, 97200 ,Le Lamentin, Martinique, France CNRS-Universite Montpellier II, Place E. Bataillon, 34095 Montpellier Cedex 5, France

Faculte des Sciences et Techniques de Tanger, B.P. 416, Tanger, Marocco

Departamento de fisica, FEC, LUZ. Maracaibo, Venezuela

CNRS-Universite Montpellier II, Place E. Bataillon, 34095 Montpellier Cedex 5, France

Princeton University, Civil & Env. Eng., Eng. Quad. E-319, Princeton, NJ 08544 USA

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2010

10.4028/www.scientific.net/KEM.423.15

Key engineering materials

Key engineering materials

ISSN：1013-9826
年,卷(期)：2010.423
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