A Novel Bioinspired Multilayered Polymer–<scp>C</scp>eramic Composite with Outstanding Crack Resistance

Tushtev, Kamen; Gonsior, Michael; Murck, Michael; Grathwohl, Georg; Rezwan, Kurosch

doi:10.1002/adem.201300204

Cited by 16 publications

(9 citation statements)

References 31 publications

(30 reference statements)

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“…During the process of hundreds of million years of evolution, nature has already developed the ability to turn brittleness into toughness by combining ceramic and organic matter into hybrid composites, which exhibit much enhanced strength in comparison to their constituents. [33,34] Examples include wood, [1] bone, [35,36] sponge, [37] nacre, [38] crustaceans, and exoskeleton of arthropods. [39,40] As a typical example, crustacean cuticle was formed from a chitin-protein organic template, mineralized by calcium phosphate and calcium carbonate, resulting a composite structure comprised of organic core and inorganic shell, whose stiffness (>5 GPa) and hardness (>100 MPa) exceed constituent material.…”

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confidence: 99%

Mechanical Properties of Diamond‐Structured Polymer Microlattices Coated with the Silicon Nitride Film

et al. 2015

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Inspired by crystal structures of the diamond and polymer/ceramic core-shell structures of hard biological materials, diamond-structured polymer/SiN microlattices with enhanced mechanical properties have been fabricated by 3D printing and plasma enhanced chemical vapor deposition method. It is found that the compressive strength of the resultant microlattices improves with increasing silicon nitride film thickness and can reach 1.95 MPa at the thickness of 400 nm, which is 3.4 times higher than the pure polymer, but a little increase of 4.8% in density, which is only 169.2 kg m À3 . The work may provide a simplified and feasible avenue to improve the strength of low density materials.Lightweight cellular materials have wide applications in fields of aerospace, transportation, and architecture, due to their unique properties such as acoustic absorption, [1,2] energy absorption, [3] thermal insulation, [4] and shock or vibration damping. [5] Human have created numerous lightweight cellular materials, including honeycombs, [6,7] aerogels, [8][9][10] foams, [11][12][13][14][15] microlattices. [16] Microlattices are a new class of cellular materials possessing lower density and better mechanical performance than traditional random foams, because of the order and periodicity in structure. There have been many studies on microlattices with different constituent, like polymer, [17,18] metal, [19][20][21] ceramic, [22][23][24][25] and graphene. [26] The structure of lattices is formed by repeating a unit cell with specific geometry periodically in three dimensions, so, the density and mechanical performance of the lattices depend strongly on the cell geometry including shape, size, and structural hierarchy. [27][28][29] Among common topologies used to produce structure materials, the diamond structure is preferred for attaining high strength and lower density materials for its special configuration, which exhibits high spatial symmetry and strong stability to resist deformation. [30][31][32] The strength of lattice materials is determined not only by the architecture but also by the constituent materials. Among numerous engineering materials, ceramics have the highest strength and stiffness. Furthermore, silicon nitride is one of the materials with highest hardness in nature, which belongs to atomic crystal. However, ceramics are limited for applications because of their brittleness. During the process of hundreds of million years of evolution, nature has already developed the ability to turn brittleness into toughness by combining ceramic and organic matter into hybrid composites, which exhibit much enhanced strength in comparison to their constituents. [33,34] Examples include wood, [1] bone, [35,36] sponge, [37] nacre, [38] crustaceans, and exoskeleton of arthropods. [39,40] As a typical example, crustacean cuticle was formed from a chitin-protein organic template, mineralized by calcium phosphate and calcium carbonate, resulting a composite structure comprised of organic core and inorganic shell, whose stiffness (>5 G...

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Mechanical Properties of Diamond‐Structured Polymer Microlattices Coated with the Silicon Nitride Film

et al. 2015

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“…In particular, many new nacre‐like composites with excellent mechanical properties have been reported quite recently . The failure of human‐designed bio‐inspired composites based on ceramics and polymers can be divided into 2 stages.…”

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confidence: 99%

“…During the second stage, a main crack starts to grow, derived from twisted microcracks, which are dissipated according to the composite microstructure design. The main crack can be further diverted or branched into the polymer or at the ceramic‐polymer boundary . Such mechanisms become more pronounced with additional composite layers.…”

Section: Introductionmentioning

confidence: 99%

Strong and super tough: Layered ceramic‐polymer composites with bio‐inspired morphology

et al. 2018

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Bio‐inspired layered ceramic‐polymer composites with high strength and toughness were prepared from sintered aluminum oxide ceramic sheets and cationically curing epoxy resins toughened with poly(ε‐caprolactone) (PCL). The architecture of the composite is inspired by nacre but is arranged on a larger scale. Ceramic sheets with a nominal thickness of 250 μm were assembled into composite plates by adhesive layers with a nominal thickness of 20 μm. Before the manufacturing of the composites, the stress‐strain properties of the polymer component were tailored by the variation in the PCL content between 0 and 39 wt%. For composites with 4 and 15 ceramic layers, the bending strengths achieved 327 MPa and 376 MPa, which are higher than that of pure ceramic sheets. Moreover, composites with 15 ceramic layers show a 16 times higher toughness compared to that of the pure ceramic sheets. The results indicate that the toughness of the layered composites increases significantly with the number of layers. Inspired by the geometrical ratio of the natural sheet composite nacre, we have achieved a similar strength but a 2 times higher toughness than nacre by only adding up to 6 vol% of the polymer.

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“…[1,2] However, the brittleness of the ceramics has seriously limited their further applications. [4][5][6][7][8] Among them, the addition of secondary strong and tough nanofillers has become popular for a significant improvement in the mechanical properties of the ceramic matrices can be achieved by introducing a small percentage of these nanofillers. [4][5][6][7][8] Among them, the addition of secondary strong and tough nanofillers has become popular for a significant improvement in the mechanical properties of the ceramic matrices can be achieved by introducing a small percentage of these nanofillers.…”

Section: Introductionmentioning

confidence: 99%

Spark Plasma Sintering and Characterization of Graphene Platelet/Ceramic Composites

Jiang

Liu

2014

Adv Eng Mater

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This paper reports a study on sintering and characterization of graphene platelet (GPL)-reinforced ceramic composites. Alumina (Al 2 O 3 ) and zirconia (ZrO 2 ) toughened Al 2 O 3 (ZTA) composites reinforced with GPLs are fabricated, respectively, using spark plasma sintering. The microstructures and mechanical properties of the sintered samples are investigated. It is found that the addition of GPLs hinders the growth of the ceramic matrix grains and help form homogenous microstructures of the ceramic matrices. Agglomeration of GPLs occurs during the fabrication process and formation of GPL aggregates is impeded when ceramic powders of smaller particle size and a shorter milling process are used. Fracture toughness of the ceramic matrices is significantly improved by introducing GPLs. Approximately, a 26.4% and a 29% improvements in fracture toughness are achieved for GPL/Al 2 O 3 and GPL/ZTA composites, respectively. The main toughening mechanisms induced by GPLs are pullout and crack bridging.

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A Novel Bioinspired Multilayered Polymer–Ceramic Composite with Outstanding Crack Resistance

Abstract: Fig. 3. (a) Failure of a SENB-test specimen; (b) crack resistance-curve showing the stress intensity factor K I as a function of the crack extension Da. K. Tushtev et al./A Novel Bioinspired Multilayered Polymer-Ceramic Composite … ADVANCED ENGINEERING MATERIALS 2014, 16, No. 2

Cited by 16 publications

References 31 publications

Mechanical Properties of Diamond‐Structured Polymer Microlattices Coated with the Silicon Nitride Film

Mechanical Properties of Diamond‐Structured Polymer Microlattices Coated with the Silicon Nitride Film

Strong and super tough: Layered ceramic‐polymer composites with bio‐inspired morphology

Spark Plasma Sintering and Characterization of Graphene Platelet/Ceramic Composites

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