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Journal Articles Materialia Year : 2020

A simple approach to bulk bioinspired tough ceramics


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.
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hal-02493649 , version 1 (28-02-2020)



Hassan Saad, Kaoutar Radi, Thierry Douillard, David Jauffres, Christophe L Martin, et al.. A simple approach to bulk bioinspired tough ceramics. Materialia, 2020, 12, pp.100807. ⟨10.1016/j.mtla.2020.100807⟩. ⟨hal-02493649⟩
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