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±30MPa) while keeping the excellent damage resistance demonstrated previously at the millimeter scale with a crack initiation toughness of 6.6MPa.m1/2 and fracture toughness up to 17.6MPa.m1/2. 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.
@article{arxiv.2003.11898,
title = {A simple approach to bulk bioinspired tough ceramics},
author = {Hassan Saad and Kaoutar Radi and Thierry Douillard and David Jauffres and Christophe L. Martin and Sylvain Meille and Sylvain Deville},
journal= {arXiv preprint arXiv:2003.11898},
year = {2020}
}