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Nacre-like alumina composites based on heteroaggregation.pdf (5.8 MB)

Nacre-like Alumina Composites Based on Heteroaggregation

preprint
submitted on 02.04.2020 and posted on 03.04.2020 by Mariana Muñoz, Manuella Cerbelaud, Arnaud Videcoq, Hassan Saad, Alexandre Boulle, Sylvain Meille, Sylvain Deville, Fabrice Rossignol

High strength and high toughness are usually mutually exclusive in materials. Among all material classes, ceramics exhibit a high stiffness and strength, but they present a limited plastic deformation, which results in a moderate toughness. However, tough ceramics have been obtained using anisotropic particles organized in a "brick and mortar" microstructure, inspired by the structure of the natural nacre. Here, we propose to build nacre-like ceramic composites from colloidal suspensions using heteroaggregation of particles. Two different shaping processes are used: direct settling of suspensions or freeze-granulation. After sintering, in both cases, the platelets alignment is very good, close to that of platelets in natural nacre, with a slightly better one noted for direct settling. Despite a better platelet alignment, the toughness is lower than in previous studies showing that further improvement of the interfacial phases present in the material must now be considered to reinforce its mechanical behavior.

Funding

Bioinspired Structural Ceramic Composite – BICuIT

Agence Nationale de la Recherche

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History

Email Address of Submitting Author

sylvain.deville@univ-lyon1.fr

Institution

Institut Lumière Matière

Country

France

ORCID For Submitting Author

0000-0002-3363-3184

Declaration of Conflict of Interest

The authors declare no conflict of interest

Version Notes

This is version 1

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