Fabrication of nature-inspired bulk laminar composites by a powder processing

Kakisawa, Hideki; Sumitomo, Taro; Inoue, Ryo; Kagawa, Yutaka

doi:10.1016/j.compscitech.2009.10.003

Cited by 28 publications

(25 citation statements)

References 31 publications

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“…Glass flake powder coated with ductile metal was aligned by a roller using a 3D printing machine to form a green sample and then hot-pressed [129]. The coating layer became the matrix phase between the flake powders after hot-pressing; a well-organized brick and mortar structure with a high flake volume fraction of 87% was obtained.…”

Section: Methods For Bulk Ceramics-based Materialsmentioning

confidence: 99%

“…Several works utilized flake ceramics powder or layered clay as a reinforcing inorganic platelet material and mixed it with matrix using a variety of ways of aligning the inorganic platelets [127][128][129][130][131]. Thin Al 2 O 3 flake powder was aligned by slip casting and then hot-pressed in an epoxy matrix, yielding a flake volume fraction of 60% [127].…”

Section: Methods For Bulk Ceramics-based Materialsmentioning

confidence: 99%

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The toughening mechanism of nacre and structural materials inspired by nacre

Kakisawa

Sumitomo²

2011

Science and Technology of Advanced Materials

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139

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The structure and the toughening mechanism of nacre have been the subject of intensive research over the last 30 years. This interest originates from nacre's excellent combination of strength, stiffness and toughness, despite its high, for a biological material, volume fraction of inorganic phase, typically 95%. Owing to the improvement of nanoscale measurement and observation techniques, significant progress has been made during the last decade in understanding the mechanical properties of nacre. The structure, microscopic deformation behavior and toughening mechanism on the order of nanometers have been investigated, and the importance of hierarchical structure in nacre has been recognized. This research has led to the fabrication of multilayer composites and films inspired by nacre with a layer thickness below 1 µm. Some of these materials reproduce the inorganic/organic interaction and hierarchical structure beyond mere morphology mimicking. In the first part of this review, we focus on the hierarchical architecture, macroscopic and microscopic deformation and fracture behavior, as well as toughening mechanisms in nacre. Then we summarize recent progress in the fabrication of materials inspired by nacre taking into consideration its mechanical properties.

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Section: Methods For Bulk Ceramics-based Materialsmentioning

confidence: 99%

Section: Methods For Bulk Ceramics-based Materialsmentioning

confidence: 99%

The toughening mechanism of nacre and structural materials inspired by nacre

Kakisawa

Sumitomo²

2011

Science and Technology of Advanced Materials

Self Cite

139

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“…Although the concepts underlying the design of nacre-inspired materials are quite straightforward [15], the development of such composites is constrained by our ability to make them. Conventional processing techniques, e.g., tape casting and hot pressing [18,19], are unable to replicate the hierarchy observed in natural composites such that toughening is generated mainly from crack deflection rather than concomitant mechanisms acting at multiple length-scales. ''Bottom-up'' approaches, such as layer-by-layer deposition [20,21], self-assembly [22,23], etc., are often not suitable to fabricate bulk materials and are generally limited to thin films of moderate practical interest.…”

Section: Introductionmentioning

confidence: 99%

Developing strength and toughness in bio-inspired silicon carbide hybrid materials containing a compliant phase

et al. 2015

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a b s t r a c tFreeze casting has proven to be a versatile processing route to fabricate bio-inspired (''nacre-like'') hybrid composites that exhibit unique combinations of strength and toughness (damage-tolerance). To date, however, the effects of small changes in the architecture of such composites on their mechanical properties have been poorly investigated. Here we examine the influence of microstructural features such as ceramic/polymer ratio, layer thickness, and presence of bridges between ceramic lamellae, on the mechanical performance of the resulting composites. To this end, we compare the flexural strength and resistance to failure of a suite of silicon carbide/polymethyl methacrylate (SiC/PMMA) layered composites made by polymer infiltration of freeze-cast SiC scaffolds with various architectures. Our composite structures all show an increasing fracture resistance with crack extension (rising R-curve behavior) due to extrinsic toughening mechanisms such as uncracked-ligament bridging, inelastic deformation of ductile layers, lamellae pull out and ceramic bridge fracture. We show that a fine tuning of the composite architecture can lead to SiC/PMMA samples with a dendritic morphology, which exhibit the best strength and toughness. Specifically, the presence of ceramic bridges connecting the lamellae is seen to provide a strengthening effect similar to the mineral bridges between aragonite platelets in nacre, where they prevent debonding and limit platelet sliding; additionally, the fracture of these bridges between lamellae during crack extension is a potent toughening mechanism, thereby conferring optimal damage tolerance to the material.

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“…Shells, which are composites of calcium carbonate plates and organic materials, have excellent fracture resistance compared with the pure calcium carbonate [1]. Nacre has a hierarchical structure consisting of ordered layers of aragonite plates, about 5 µm long and 500 nm thick, within a polymer matrix and the plates are made of nanograins [2].…”

Section: Introductionmentioning

confidence: 99%

Hierarchical structures of ZnO spherical particles synthesized solvothermally

Saito

Haneda

2011

Science and Technology of Advanced Materials

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We review the solvothermal synthesis, using a mixture of ethylene glycol (EG) and water as the solvent, of zinc oxide (ZnO) particles having spherical and flower-like shapes and hierarchical nanostructures. The preparation conditions of the ZnO particles and the microscopic characterization of the morphology are summarized. We found the following three effects of the ratio of EG to water on the formation of hierarchical structures: (i) EG restricts the growth of ZnO microcrystals, (ii) EG promotes the self-assembly of small crystallites into spheroidal particles and (iii) the high water content of EG results in hollow spheres.

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Fabrication of nature-inspired bulk laminar composites by a powder processing

Cited by 28 publications

References 31 publications

The toughening mechanism of nacre and structural materials inspired by nacre

The toughening mechanism of nacre and structural materials inspired by nacre

Developing strength and toughness in bio-inspired silicon carbide hybrid materials containing a compliant phase

Hierarchical structures of ZnO spherical particles synthesized solvothermally

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