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A Simple Approach to Bulk Bioinspired Tough Ceramics

preprint
submitted on 13.03.2020 and posted on 13.03.2020 by Hassan Saad, Kaoutar Radi, Thierry Douillard, David Jauffres, Christophe Martin, Sylvain Deville
The development of damage-resistant structural materials that can withstand harsh environments is a major issue in materials science and engineering. Bioinspired brick-and-mortar designs have recently demonstrated a range of interesting mechanical properties in proof-of-concept studies. However, reproducibility and scalability issues associated with the actual processing routes have impeded further developments and industrialization of such materials. Here we demonstrate a simple approach based on uniaxial pressing and field assisted sintering of commercially available raw materials to process bioinspired ceramic/ceramic composites of larger thickness than previous approaches, with a sample thickness up to 1 cm. The ceramic composite retains the strength typical of dense alumina (430 ± 30 MPa) while keeping the excellent damage resistance demonstrated previously at the millimeter scale with a crack initiation toughness of 6.6 MPa.m 1/2 and fracture toughness up to 17.6 MPa.m 1/2. These results validate the potential of these all-ceramic composites, previously demonstrated at lab scale only, and could enable their optimization, scale-up, and industrialization.

Funding

Bioinspired Structural Ceramic Composite – BICuIT

Agence Nationale de la Recherche

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AGIR-POLE-PEM 2016

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

no conflict of interest

Version Notes

first version

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