Characterization of the porous structures of the green body and sintered biomedical titanium scaffolds with micro-computed tomography

Budi Arifvianto, Sander Leeflang, Jie Zhou

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)

Abstract

The present research was aimed at gaining an understanding of the porous structure changes from the green body through water leaching and sintering to titanium scaffolds. Micro-computed tomography (micro-CT) was performed to generate 3D models of titanium scaffold preforms containing carbamide space-holding particles and sintered scaffolds containing macro- and micro-pores. The porosity values and structural parameters were determined by means of image analysis. The result showed that the porosity values, macro-pore sizes, connectivity densities and specific surface areas of the titanium scaffolds sintered at 1200 °C for 3 h did not significantly deviate from those of the green structures with various volume fractions of the space holder. Titanium scaffolds with a maximum specific surface area could be produced with an addition of 60–65 vol% carbamide particles to the matrix powder. The connectivity of pores inside the scaffold increased with rising volume fraction of the space holder. The shrinkage of the scaffolds prepared with > 50 vol% carbamide space holder, occurring during sintering, was caused by the reductions of macro-pore sizes and micro-pore sizes as well as the thickness of struts. In conclusion, the final porous structural characteristics of titanium scaffolds could be estimated from those of the green body.
Original languageEnglish
Pages (from-to)48-60
JournalMaterials Characterization
Volume121
DOIs
Publication statusPublished - 2016

Keywords

  • Titanium scaffold
  • Space holder
  • Porous structure
  • Green body
  • Sintering

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