Particle redistribution and structural defect development during ice templating - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Acta Materialia Année : 2012

Particle redistribution and structural defect development during ice templating

Résumé

The freezing of colloidal suspensions is encountered in many natural and engineering processes. It can be harnessed through a process known as ice templating, to produce porous materials and composites exhibiting unique functional properties. The phenomenon by itself appears simple: a solidification interface propagates through a colloidal suspension. We are nevertheless still far from a complete understanding and control of the phenomenon. Such lack of control is reflected in the very large scattering of mechanical properties reported for ice-templated ceramics, largely due to the formation of structural defects. Through systematic in situ investigations, we demonstrate here the role of the suspension composition and the role of particle-particle electrostatic interactions on defect formation during ice templating. Flocculation can occur in the intercrystal space, leading to a destabilisation of the solid/liquid interface triggering the growth of crystals perpendicular to the main ice growth direction. This mechanism largely contributes to the formation of structural defects and explains, to a large extent, the scattering of compressive strength values reported in the literature.

Domaines

Matériaux
Fichier principal
Vignette du fichier
Particle redistribution and structural defect development during ice templating.pdf (2.3 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01133901 , version 1 (17-05-2018)

Identifiants

Citer

Audrey Lasalle, Christian Guizard, Eric Maire, Jérôme Adrien, Sylvain Deville. Particle redistribution and structural defect development during ice templating. Acta Materialia, 2012, 60 (11), pp.4594-4603. ⟨10.1016/j.actamat.2012.02.023⟩. ⟨hal-01133901⟩
108 Consultations
52 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More