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Plastic densification in silica aerogels

Published online by Cambridge University Press:  15 June 1999

T. Woignier ,
I. Beurroies ,
P. Delord ,
V. Gibiat ,
R. Sempere  and
J. Phalippou
T. Woignier
Affiliation:
Laboratoire des Verres (UMR 5587), Université Montpellier II, place Eugène Bataillon, 34095 Montpellier Cedex, France
I. Beurroies
Affiliation:
Laboratoire des Verres (UMR 5587), Université Montpellier II, place Eugène Bataillon, 34095 Montpellier Cedex, France
P. Delord
Affiliation:
Groupe de Dynamique des Phases Condensées, Université Montpellier II, place Eugène Bataillon, 34095 Montpellier Cedex, France
V. Gibiat
Affiliation:
Laboratoire Ondes acoustiques (URA 1503), ESPCI, Université Paris 7, 10 rue Vauquelin, 75005 Paris, France
R. Sempere
Affiliation:
Laboratoire des Verres (UMR 5587), Université Montpellier II, place Eugène Bataillon, 34095 Montpellier Cedex, France
J. Phalippou
Affiliation:
Laboratoire des Verres (UMR 5587), Université Montpellier II, place Eugène Bataillon, 34095 Montpellier Cedex, France
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Abstract

Under isostatic pressure aerogels display an irreversible shrinkage caused by plastic deformation. As a consequence of this plastic shrinkage it is possible to densify, and thus to modify the elastic properties of aerogels. We show that the elasticity of the material is strongly influenced by structural transformation, and we observe a weakening of the network during the first stage of densification. The structural evolution, followed by Small Angle X-ray Scattering, shows that the densification mechanism is different from the one obtained by a sintering at high temperature. The densification mechanism induces a textural change at the periphery of the constitutive clusters but not inside, in contrast to viscous sintering.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 6 , Issue 3 , June 1999 , pp. 267 - 271
Copyright
© EDP Sciences, 1999

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