Porous titanium cylinders obtained by the freeze- casting technique: Influence of process parameters on porosity and mechanical behavior

Paloma Trueba, Ana M. Beltrán*, José Manuel Bayo, José Antonio Rodríguez-ortiz, Diego F. Larios, Esteban Alonso, David C. Dunand, Yadir Torres

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The discrepancy between the stiffness of commercially pure titanium and cortical bone tissue compromises its success as a biomaterial. The use of porous titanium has been widely studied, however, it is still challenging to obtain materials able to replicate the porous structure of the bones (content, size, morphology and distribution). In this work, the freeze-casting technique is used to manufacture cylinders with elongated porosity, using a home-made and economical device. The relationship between the processing parameters (diameter and material of the mold, temperature gradient), microstructural features and mechanical properties is established and discussed, in terms of ensuring biomechanical and biofunctional balance. The cylinders have a gradient porosity suitable for use in dentistry, presenting higher Young’s modulus at the bottom, near the cold spot and, therefore better mechanical resistance (it would be in contact with a prosthetic crown), while the opposite side, the hot spot, has bigger, elongated pores and walls.

Original languageEnglish (US)
Article number188
JournalMetals
Volume10
Issue number2
DOIs
StatePublished - Feb 2020

Keywords

  • Bone replacement
  • Freeze-casting
  • Mechanical behavior
  • Porous titanium
  • Stressshielding
  • Temperature control

ASJC Scopus subject areas

  • Materials Science(all)

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