On the development of ice-templated silicon carbide scaffolds for nature-inspired structural materials

Naglieri, Valentina; Bale, Hrishikesh; Gludovatz, Bernd; Tomsia, Antoni P.; Ritchie, Robert O.

doi:10.1016/j.actamat.2013.08.006

Cited by 93 publications

(67 citation statements)

References 48 publications

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“…After water sublimation, the scaffolds were first treated in air at 450°C for 4 h and then sintered in inert atmosphere at 1900°C for 30 min. Details on the effects of the processing parameters on the ceramic fraction and the architecture of the scaffolds are reported elsewhere [29]. Based on that study, we selected a combination of parameters to produce scaffolds with three different ceramic contents: 40, 50 and 60 vol.%.…”

Section: Processingmentioning

confidence: 99%

“…Porous silicon carbide scaffolds were prepared by freeze casting, following the procedure described in detail in our previous study [29]. We prepared suspensions containing 17-30 vol.% of SiC powders with sintering aids (Al 2 O 3 and Y 2 O 3 ) dispersed in deionized water, and added 5 wt.% polyethylene glycol (PEG) as a binder.…”

Section: Processingmentioning

confidence: 99%

“…This technique has been exploited to produce scaffolds with complex porosity [24,[26][27][28][29][30], and has proven to be effective for the fabrication of nacre-like composites based on alumina [3,6,8,24,25]. By unidirectional freezing of a ceramic suspension, a solid body made of alternate layers of ice and ceramic particles is produced.…”

Section: Introductionmentioning

confidence: 98%

“…Based on observations that the structures obtained by freeze casting can change considerably by varying the processing parameters [29], the objective of the current study was specifically to investigate the influence that these changes can have on the mechanical response of ceramic/polymer lamellar composites. As silicon carbide (SiC) had never been examined in this context, we used freeze casting to fabricate SiC scaffolds with characteristic pores morphologies, either lamellar or dendritic.…”

Section: Introductionmentioning

confidence: 99%

“…Control of the freezing conditions, suspension characteristics and additives is paramount to tailor the features of the scaffolds, such as size and morphology of pores, thickness and roughness of ceramic walls, ceramic fraction, etc. [24,29,31,32]. By careful control of the processing parameters, lamellar composites containing up to 45 vol.% of ceramic were first fabricated [24].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Processingmentioning

confidence: 99%

Section: Processingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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Lamellar Ceramic Semicrystalline‐Polymer Composite Fabricated by Freeze Casting

et al. 2017

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Understanding the role of ductile polymer phase in mechanical behavior of bioinspired hybrid composites is an important step toward development of materials with damage tolerant properties. Herein, the authors report on fabrication and characterization of a bioinspired lamellar composite by incorporation of a semicrystalline polymer into a freeze casted scaffold. The elastic modulus and ductility of the polymer phase can be changed by more than three and 55 times, respectively, in addition to 42 folds decrease in modulus of toughness, by thermal annealing post-processing, after infiltration into the freeze casted ceramic scaffold. The results show that although polymer phase affects the fracture toughness and flexural behavior of the composite, the drastic changes in mechanical properties of the polymer phase has only marginal effect in the resulted properties of the composite. The authors use in situ SEM experiments and finite element simulation to investigate the deformation mechanism and the effect of the polymer phase on the distribution of stress in the fabricated composites.

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Phase‐Field Modeling of Microstructural Evolution by Freeze‐Casting

Huang

Lin

et al. 2017

Adv Eng Mater

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Freeze-casting has attracted great attention as a potential method for manufacturing bioinspired materials with excellent flexibility in microstructure control. The solidification of ice crystals in ceramic colloidal suspensions plays an important role during the dynamic process of freeze-casting. During solidification, the formation of a microstructure results in a dendritic pattern within the ice-template crystals, which determines the macroscopic properties of materials. In this paper, the authors propose a phase-field model that describes the crystallization in an ice template and the evolution of particles during anisotropic solidification. Under the assumption that ceramic particles represent mass flow, namely a concentration field, the authors derive a sharpinterface model and then transform the model into a continuous initial boundary value problem via the phase-field method. The adaptive finite-element technique and generalized single-step single-solve (GSSSS) time-integration method are employed to reduce computational cost and reconstruct microstructure details. The numerical results are compared with experimental results, which demonstrate good agreement. Finally, a microstructural morphology map is constructed to demonstrate the effect of different concentration fields and input cooling rates. The authors observe that at particle concentrations ranging between 25 and 30% and cooling rate lower than À5 min À1 generates the optimal dendrite structure in freeze casting process.

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On the development of ice-templated silicon carbide scaffolds for nature-inspired structural materials

Cited by 93 publications

References 48 publications

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

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

Lamellar Ceramic Semicrystalline‐Polymer Composite Fabricated by Freeze Casting

Phase‐Field Modeling of Microstructural Evolution by Freeze‐Casting

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