Effects of porosity and strain rate on the uniaxial compressive response of ice-templated sintered macroporous alumina

Banda, Mahesh; Ghosh, Dipankar

doi:10.1016/j.actamat.2018.02.027

Cited by 27 publications

(7 citation statements)

References 52 publications

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“…In particular, bridges may form between the cement lamellae because of the splitting of the dendritic tips of ice crystals, the engulfment of cement particles within the dendrites, and the subsequent healing of the tips. [ 23,24 ]…”

Section: Resultsmentioning

confidence: 99%

“…It is noted that the varying cooling rates with the distance from cold finger during the freezing process generally lead to differences in the thickness and spacing of lamellae in the ice‐templated scaffolds. [ 23,24,33,34 ] Nevertheless, such inhomogeneity has been revealed to mainly occur close to the bottom of mold, i.e., at the initial stage for the rapid growth of ice crystals, but become less evident as the solidification process reaches a relatively steady state. [ 33,34 ] For the current cement, the structural inhomogeneity is seen to concentrate to the end near the wedge, as shown in Figure S4 (Supporting Information), and is indiscernible over a range of several millimeters in the bulk (Figures 1b and 2a).…”

Section: Resultsmentioning

confidence: 99%

“…The ice‐templating technique offers a viable approach for creating unidirectional micropores in materials, and has been widely employed in various material systems, e.g., ceramics, polymers, metals, and their composites. [ 23,24,33,34,42–44 ] Recent attempts have also been devoted in ice‐templating cement materials. [ 45,46 ] It is critical for preserving the ice‐templated architectures by avoiding the collapse or re‐melting of the frozen body during the removal of ice.…”

Section: Discussionmentioning

confidence: 99%

“…This invariably necessitates a freeze‐drying treatment to sublimate the ice, which requires long time processing of evacuation combined with refrigeration. [ 24 ] For example, it typically takes more than 3 days to achieve an adequate drying of laboratory‐scale samples of tens of millimeters in dimension. [ 42–46 ] The considerable energy consumption and time cost, together with the strict size limit by the vacuum chamber for freeze drying, make the ice‐templating technique inapplicable for the mass production in engineering.…”

Section: Discussionmentioning

confidence: 99%

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Wood‐Inspired Cement with High Strength and Multifunctionality

Wang

Jiao

et al. 2020

Advanced Science

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Taking lessons from nature offers an increasing promise toward improved performance in man‐made materials. Here new cement materials with unidirectionally porous architectures are developed by replicating the designs of natural wood using a simplified ice‐templating technique in light of the retention of ice‐templated architectures by utilizing the self‐hardening nature of cement. The wood‐like cement exhibits higher strengths at equal densities than other porous cement‐based materials along with unique multifunctional properties, including effective thermal insulation at the transverse profile, controllable water permeability along the vertical direction, and the easy adjustment to be water repulsive by hydrophobic treatment. The strengths are quantitatively interpreted by discerning the effects of differing types of pores using an equivalent element approach. The simultaneous achievement of high strength and multifunctionality makes the wood‐like cement promising for applications as new building materials, and verifies the effectiveness of wood‐mimetic designs in creating new high‐performance materials. The simple fabrication procedure by omitting the freeze‐drying treatment can also promote a better efficiency of ice‐templating technique for the mass production in engineering and may be extended to other material systems.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Wood‐Inspired Cement with High Strength and Multifunctionality

Wang

Jiao

et al. 2020

Advanced Science

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“…Also, compressive strength of these materials measured along the growth direction of ice crystals is significantly higher compared to that of open-cell porous ceramics. Our recent studies revealed that the compressive response of these materials is strongly influenced by strain rate regime (quasistatic vs. dynamic), and properties under dynamic loading conditions could improve by about 100% depending on the porosity and morphology [34][35][36]. Also, under dynamic loading conditions, these materials exhibit progressive crushing type failure attributing energy-absorbing ability irrespective of porosity and morphology, which is in sharp contrast to their quasistatic response.…”

Section: Discussionmentioning

confidence: 99%

Role of Microstructure on Impact Response and Damage Morphology of Ice-Templated Porous Ceramics

Akurati

Terrones

Ghosh

2020

J. dynamic behavior mater.

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The central focus of this study is to investigate the influence of microstructure and direction of impact (relative to the growth direction of ice crystals) on the impact behavior of ice-templated sintered alumina materials and understand the relationship between dynamic compressive strength and impact response. All materials were fabricated using alumina suspensions of the same solid loading but at three different freezing front velocity (FFV) regimes; very-high FFV, moderately-high FFV, and low FFV. Lamella wall thickness, pore size, and pore aspect ratio decreased, and wall connectivity increased with FFV. Materials also exhibited a structural gradient along the growth direction of ice crystals. As the templated microstructure became finer with FFV, the impact resistance of the materials increased, and radius of damage crater, depth-of-penetration, and mass loss decreased. Materials also exhibited radial cracking, and the materials fabricated at very-high FFV showed a greater propensity for radial cracking for impact along the growth direction. The impact process evolved in three phases; penetration phase, dwell phase and rebound phase. Analysis of high-speed videos revealed that modifying the microstructure affected not only the impact resistance but also the duration of these phases. Variation in microstructure caused a change in the mechanism of damage evolution during impact. Dynamic compressive strength increased with FFV, and the results revealed a direct relationship between impact response and strength. For both impact and dynamic compression, energy absorption per unit volume increased with FFV, further reinforcing the relationship between impact behavior and the dynamic compressive response of ice-templated materials.

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