Reverse freeze casting: A new method for fabricating highly porous titanium scaffolds with aligned large pores

Yook, Se Won; Jung, Hyun‐Do; Park, Chang Hoon; Shin, Kangwon; Koh, Young Hag; Estrin, Yuri; Kim, Hyoun Ee

doi:10.1016/j.actbio.2012.03.020

Cited by 84 publications

(44 citation statements)

References 64 publications

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“…Compressive strength and failure modes (all materials and all solvents reported in the papers analyzed in this meta-analysis): brittle (yellow) [25, 64, 85] or cellular (blue) [25, 26, 28, 33, 40, 41, 51, 58, 64, 65, 70, 85, 90, 91, 94–96, 98, 103, 127, 132, 135]. …”

Section: Resultsmentioning

confidence: 99%

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A meta-analysis of the mechanical properties of ice-templated ceramics and metals

Deville

Meille

Seuba

2015

Science and Technology of Advanced Materials

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Ice templating, also known as freeze casting, is a popular shaping route for macroporous materials. Over the past 15 years, it has been widely applied to various classes of materials, and in particular ceramics. Many formulation and process parameters, often interdependent, affect the outcome. It is thus difficult to understand the various relationships between these parameters from isolated studies where only a few of these parameters have been investigated. We report here the results of a meta analysis of the structural and mechanical properties of ice templated materials from an exhaustive collection of records. We use these results to identify which parameters are the most critical to control the structure and properties, and to derive guidelines for optimizing the mechanical response of ice templated materials. We hope these results will be a helpful guide to anyone interested in such materials.

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Section: Resultsmentioning

confidence: 99%

“…Color code: blue: no defects [26–31, 33, 36, 38, 40, 41, 43, 44, 46, 50–55, 61, 64, 65, 67, 68, 70, 71, 73, 77, 78, 85, 90, 91, 94, 98, 100, 103–110, 113, 115, 118, 124–127, 129, 130, 132, 134, 135, 143], yellow: defects [25, 52, 86, 91, 96], white: cannot tell from the published micrographs [37, 39, 49, 56, 91, 95, 96, 119]. …”

Section: Resultsmentioning

confidence: 99%

A meta-analysis of the mechanical properties of ice-templated ceramics and metals

Deville

Meille

Seuba

2015

Science and Technology of Advanced Materials

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“…Very fast cooling rates can result in the formation of dense material [21] , while large particle sizes can result in particle entrapment by the crystals giving lower porosity (for example 38 % [19] ) and smaller, non-elongated pores. A total porosity of up to 69 % has so far been achieved by this method [22] . …”

Section: Freeze Castingmentioning

confidence: 99%

Open Celled Porous Titanium

Shbeh

Goodall

2017

Adv Eng Mater

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[**] One of the authours (MMS) would like to acknowledge a studentship from the Iraqi Ministry of Higher Education and Scientific Research.Among the porous metals, those made of titanium attract particular attention due to the interesting properties of this element. This review examines the state of research understanding and technological development of these materials, in terms of processing capability, resultant structure and properties and the most advanced applications under development. The impact of the rise of additive manufacturing techniques on these materials is discussed, along with the likely future directions required for these materials to find practical applications on a large scale.

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“…Incomplete sintering was also observed, which affected the pore structure and mechanical properties of resultant titanium foams. As an alternative, a reverse freeze casting technique has been developed, where camphene dendrites initially form a template, before the titanium slurry is introduced in order to overcome rapid sedimentation of the large and heavy titanium powders (Yook et al 2012). However, this is an indirect process which require processing times exceeding 24 h.…”

Section: Introductionmentioning

confidence: 99%

Gelatin freeze casting of biomimetic titanium alloy with anisotropic and gradient pore structure

et al. 2017

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Abstract. Titanium metal and its alloys are materials commonly used for dental and orthopaedic implants. However, due to large difference in properties between the titanium metal and the natural bone, stress shielding has been observed around the surround area, resulting in bone atrophy, and thus has raised concerns of the use of this material. Ideally implant materials should possess similar properties to the surrounding tissues in order to distribute the load as the joint would naturally, while also possessing a similar porous structure to the bone to enable interaction with the surrounding material. In this paper we report the formation of aligned porous titanium alloy scaffolds with the use of unidirectional freeze casting with a temperature gradient. The resulting scaffolds had a dense bottom part with sufficient strength for loading, while the top part remaining porous in order to allow bone growth in the scaffold and fully integrating with the surrounding tissue. The anisotropic nature of the pores within the titanium alloy samples were observed via micro computed tomography, where a gradient structure similar to bone was observed. The compressive strength of the fabricated scaffolds was found to be up to 427 MPa when measured with the pores aligned with the applied load, depending on the pore density. This is within the range of cortical bone.

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Reverse freeze casting: A new method for fabricating highly porous titanium scaffolds with aligned large pores

Cited by 84 publications

References 64 publications

A meta-analysis of the mechanical properties of ice-templated ceramics and metals

A meta-analysis of the mechanical properties of ice-templated ceramics and metals

Open Celled Porous Titanium

Gelatin freeze casting of biomimetic titanium alloy with anisotropic and gradient pore structure

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