Dynamic freeze casting for the production of porous titanium (Ti) scaffolds

Mater Sci Eng C Mater Biol Appl. 2013 Jan 1;33(1):59-63. doi: 10.1016/j.msec.2012.08.004. Epub 2012 Aug 17.

Abstract

This paper proposes dynamic freeze casting as a new manufacturing technique for producing porous Ti scaffolds with a uniform porous structure and good ductility. In this method, Ti/camphene slurries with various initial Ti contents (15, 20, and 25 vol.%) were frozen at 44 °C for 12 h in rotation, which allowed for the extensive growth of camphene crystals and the uniform construction of walls made of Ti particles. All the fabricated samples showed spherical-like pores surrounded by dense Ti walls that were uniformly formed after sintering at 1300 °C for 2 h in a vacuum. The porosity decreased from 71 to 52 vol.% with an increase in Ti content from 15 to 25 vol.%, whereas the pore size decreased from 362 to 95 μm. On the other hand, the compressive strength and stiffness increased considerably from 57±4 to 183±6 MPa and from 1.3±0.5 to 5.0±0.8 GPa, respectively, due to the decrease in the porosity of the samples.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Carbon / analysis
  • Compressive Strength
  • Freezing*
  • Hydrogen / analysis
  • Materials Testing / methods*
  • Microscopy, Electron, Scanning
  • Oxygen / analysis
  • Porosity
  • Spectrometry, X-Ray Emission
  • Tissue Scaffolds / chemistry*
  • Titanium / pharmacology*
  • X-Ray Diffraction

Substances

  • Carbon
  • Hydrogen
  • Titanium
  • Oxygen