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Cost-effective fabrication of bio-inspired nacre-like composite materials with high strength and toughness

Wan, Hongbo, Leung, Nathanael, Algharaibeh, Sana, Sui, Tan, Liu, Qiang, Peng, Hua-Xin and Su, Bo (2020) Cost-effective fabrication of bio-inspired nacre-like composite materials with high strength and toughness Composites Part B: Engineering, 202, 108414.

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A cost-effective one-step densification process based on bi-directional freeze casting was investigated to produce nacre-like alumina/poly (methyl methacrylate) (PMMA) composites with a unique micro-layered (μL) architecture. This method has the advantage of shorter processing time, as it requires only sintering once instead of twice as in the fabrication of conventional brick-and-mortar (BM) composites via freeze casting. By tuning the processing parameters, composites with different ceramic content and layer thickness were obtained. The resultant mechanical properties of μL composites showed that ceramic content and wall thickness affected mechanical properties significantly. The μL composite with fine ceramic walls (8 μm) and relatively high ceramic fraction (72 vol%) exhibited an exceptional combination of high flexural strength (178 MPa) and fracture toughness (12.5 MPa m1/2). The μL composites were also compared with the conventional BM composites. Although the fracture behaviour of both composites exhibited similar extrinsic toughening mechanisms, the μL composites with longer ceramic walls displayed superior mechanical properties in terms of strength and fracture toughness in comparison with the BM composites comprising short ceramic walls (i.e. bricks), due to the effectiveness of stress transfer of load-bearing ceramic phase within the composites.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
Wan, Hongbo
Algharaibeh, Sana
Liu, Qiang
Peng, Hua-Xin
Su, Bo
Date : 1 December 2020
Funders : EPSRC - Engineering and Physical Sciences Research Council
DOI : 10.1016/j.compositesb.2020.108414
Copyright Disclaimer : © 2020 Elsevier Ltd. All rights reserved.
Uncontrolled Keywords : Bio-inspired composites; Brick-and-mortar (BM); Micro-layered (μL); Alumina/PMMA; Bi-directional freeze casting; Toughness
Depositing User : Diane Maxfield
Date Deposited : 06 Oct 2020 16:19
Last Modified : 06 Oct 2020 16:19

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