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

Se Won Yook, Hyun Do Jung, Chang Hoon Park, Kwan Ha Shin, Young-Hag Koh, Yuri Estrin, Hyoun Ee Kim

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

Highly porous titanium with aligned large pores up to 500 μm in size, which is suitable for scaffold applications, was successfully fabricated using the reverse freeze casting method. In this process we have newly developed, the Ti powders migrated spontaneously along the pre-aligned camphene boundaries at a temperature of 45.5 °C and formed a titanium-camphene mixture with an aligned structure; this was followed by freeze drying and sintering. As the casting time increased from 24 to 48 h, the initial columnar structures turned into lamellar structures, with the porosity decreasing from 69 to 51%. This reduction in porosity caused the compressive yield strength to increase from 121 to 302 MPa, with an elastic modulus of the samples being in the range of 2-5 GPa. In addition, it was demonstrated that reverse freeze casting can also be successfully applied to various other raw powders, suggesting that the method developed in this work opens up new avenues for the production of a range of porous metallic and ceramic scaffolds with highly aligned pores.

Original languageEnglish
Pages (from-to)2401-2410
Number of pages10
JournalActa Biomaterialia
Volume8
Issue number6
DOIs
Publication statusPublished - 2012 Jul 1

Fingerprint

Porosity
Camphene
Titanium
Scaffolds
Powders
Casting
Compressive Strength
Freeze Drying
Elastic Modulus
Ceramics
Lamellar structures
Temperature
Yield stress
Drying
Sintering
Elastic moduli
camphene

Keywords

  • Aligned pores
  • Freeze casting
  • Mechanical properties
  • Scaffold
  • Titanium (Ti)

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering
  • Biotechnology
  • Biochemistry
  • Molecular Biology

Cite this

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, Kwan Ha; Koh, Young-Hag; Estrin, Yuri; Kim, Hyoun Ee.

In: Acta Biomaterialia, Vol. 8, No. 6, 01.07.2012, p. 2401-2410.

Research output: Contribution to journalArticle

Yook, Se Won ; Jung, Hyun Do ; Park, Chang Hoon ; Shin, Kwan Ha ; Koh, Young-Hag ; Estrin, Yuri ; Kim, Hyoun Ee. / Reverse freeze casting : A new method for fabricating highly porous titanium scaffolds with aligned large pores. In: Acta Biomaterialia. 2012 ; Vol. 8, No. 6. pp. 2401-2410.
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