Nacre-like alumina composites based on heteroaggregation

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 anisotropi...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2020-12, Vol.40 (15), p.5773-5778
Main Authors: Muňoz, Mariana, Cerbelaud, Manuella, Videcoq, Arnaud, Saad, Hassan, Boulle, Alexandre, Meille, Sylvain, Deville, Sylvain, Rossignol, Fabrice
Format: Article
Language:English
Subjects:
Chemical Sciences
Engineering Sciences
Freeze-granulation
Heteroaggregation
Nacre-like composite
Physics
Platelet alignment
Settling
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Summary: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.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2020.06.049