Room‐Temperature Freeze Casting for Ceramics with Nonaqueous Sublimable Vehicles in the Naphthalene–Camphor Eutectic System

Araki, Kiyoshi; Halloran, John W.

doi:10.1111/j.1151-2916.2004.tb06353.x

Cited by 99 publications

(72 citation statements)

References 13 publications

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“…For an equivalent initial slurry concentration, the final total porosity decreases when the low local radius of curvature decreases. For green bodies where the pores are very small and intricate 8 , the porosity can be completely removed by densification.…”

Section: Resultsmentioning

confidence: 99%

Influence of surface tension, osmotic pressure and pores morphology on the densification of ice-templated ceramics

Deville

Bernard‐Granger

2011

Journal of the European Ceramic Society

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We attempt here to clarify the influence of the nature of the solvent on the ice-templating process, based on literature experimental results of porosity and suspension concentration. In particular, we compare the relative influence of surface tension, osmotic pressure and the pore size and radius of curvature on the densification of the green bodies. Variations of the osmotic pressure when changing the solvent can yield significantly different behaviour during the freezing stage and therefore significantly affect the densification behaviour, an effect not apparent when using the Shanti model. In addition, and equally important, a modification of the macropores morphology is induced by the evolution of the solvent crystals morphology, and resulting in smaller and more intricate crystals and macropores which facilitates the densification. The radius of curvature is probably also an essential parameter controlling the densification of ice-templated ceramics.

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Section: Resultsmentioning

confidence: 99%

Influence of surface tension, osmotic pressure and pores morphology on the densification of ice-templated ceramics

Deville

Bernard‐Granger

2011

Journal of the European Ceramic Society

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“…It is well established that the pore structure of freezecast materials is a direct replica of the solidified solvent structure [40][41][42]. As camphene tends to solidify in a dendritic fashion [43], its use as the solvent in freeze-casting gave rise to materials with dendritic pore channels [44][45][46]. It can be noticed from micrographs 5A to 5C that camphene dendrites grew macroscopically with a preferential orientation similar to the freezing direction, leading to elongated aligned pores and short secondary channels in the sintered body.…”

Section: Characterizationmentioning

confidence: 99%

Effect of titania addition on the properties of freeze-cast alumina samples

Silva

Nunes

Souza

et al. 2015

Ceramics International

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This work investigated the behavior of TiO 2 -containing α-Al 2 O 3 samples prepared by the freeze-casting technique. Camphene and liquid nitrogen were used as the solvent and cooling fluid, respectively. Camphene resulted in the formation of dendritic pores, in the direction of the freeze-casting cold front during sample preparation. The formation of β-Al 2 TiO 5 phase occurred at 1300 °C, and became more evident as the sintering temperatures reached 1500 °C. The TiO 2 loading did not affect the sample porosity at a given temperature, but it was detrimental in the case of mechanical properties under certain conditions. For instance, the flexural strength slightly improved with increasing the TiO 2 loading and sintering temperature from 1100 to 1300 °C. This effect was attributed to the occurrence of a more effective sintering of alumina.However, as the heat treatment temperature was raised from 1300 to 1500 °C, the flexural strength did not increase as a function of the TiO 2 loading, even though the densification occurred with loss of porosity. The loss of mechanical strength was found to be associated with the formation of microcracks which stemmed from the formation of β-Al 2 TiO 5 phase for TiO 2 loadings in excess of 4 wt% at these high sintering temperatures.

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“…This is why all classes of materials and composites made from them can, in principle, be prepared by freezing polymer solutions, metal or ceramic particle suspensions or novel micro-and nanocomposites consisting of polymer, ceramic or metal fibres and particles in a polymer solution. While the majority of freeze-cast materials is still prepared using aqueous solutions or slurries, other liquid vehicles, such as camphene (Sofie & Dogan 2001;Araki & Halloran 2005;Shanti et al 2006;Lee et al 2007a,b;Yoon et al 2007;Yook et al 2008Yook et al , 2009), camphene-naphthalene (Araki & Halloran 2004a) and tert-butyl alcohol (Chen et al 2007), are also increasingly being used. Important in the choice of the liquid carrier are properties such as its crystal structure and type of growth during solidification and its interaction with the solids dissolved or suspended in it.…”

Section: Processing Biomaterials By Freeze Castingmentioning

confidence: 99%

Biomaterials by freeze casting

Wegst

Schecter

Donius

et al. 2010

Phil. Trans. R. Soc. A.

307

254

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The functional requirements for synthetic tissue substitutes appear deceptively simple: they should provide a porous matrix with interconnecting porosity and surface properties that promote rapid tissue ingrowth; at the same time, they should possess sufficient stiffness, strength and toughness to prevent crushing under physiological loads until full integration and healing are reached. Despite extensive efforts and first encouraging results, current biomaterials for tissue regeneration tend to suffer common limitations: insufficient tissue-material interaction and an inherent lack of strength and toughness associated with porosity. The challenge persists to synthesize materials that mimic both structure and mechanical performance of the natural tissue and permit strong tissue-implant interfaces to be formed. In the case of bone substitute materials, for example, the goal is to engineer high-performance composites with effective properties that, similar to natural mineralized tissue, exceed by orders of magnitude the properties of its constituents. It is still difficult with current technology to emulate in synthetic biomaterials multi-level hierarchical composite structures that are thought to be the origin of the observed mechanical property amplification in biological materials. Freeze casting permits to manufacture such complex, hybrid materials through excellent control of structural and mechanical properties. As a processing technique for the manufacture of biomaterials, freeze casting therefore has great promise.

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Room‐Temperature Freeze Casting for Ceramics with Nonaqueous Sublimable Vehicles in the Naphthalene–Camphor Eutectic System

Cited by 99 publications

References 13 publications

Influence of surface tension, osmotic pressure and pores morphology on the densification of ice-templated ceramics

Influence of surface tension, osmotic pressure and pores morphology on the densification of ice-templated ceramics

Effect of titania addition on the properties of freeze-cast alumina samples

Biomaterials by freeze casting

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