Abstract
This study examined the utility of a combination of the thermoplastic green machining (TGM) and micro-arc oxidation (MAO) for the production of porous Ti scaffolds with 3-dimensional (3-D) periodic macrochannels coated with a microporous TiO 2 layer, which would provide high mechanical properties and excellent biocompatibility simultaneously. The TGM technique allowed for the creation of tightly controlled 3-D periodic macrochannels with a diameter of ∼828-837 μm by machining a thermoplastic compound consisting of 70 vol% titanium hydride (TiH 2) powder and 30 vol% thermoplastic binders, followed by heat-treatment in a vacuum. The overall porosity and mechanical properties of the porous Ti scaffolds were controlled by creating various periodic arrays of 6 × 6, 7 × 7, or 8 × 8 macrochannels in each face of a cube. The compressive strength and modulus was decreased from 358 ± 7 to 100 ± 8 MPa and from 5.2 ± 0.66 to 3.5 ± 0.32 GPa, respectively, with increasing porosity from 48 vol% to 64 vol%. The biocompatibility and bioactivity, which was assessed by in vitro cellular assays, were improved remarkably by creating a microporous TiO 2 coating layer using the MAO treatment.
Original language | English |
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Pages (from-to) | 897-902 |
Number of pages | 6 |
Journal | Materials Chemistry and Physics |
Volume | 135 |
Issue number | 2-3 |
DOIs | |
Publication status | Published - 2012 Aug 15 |
Keywords
- Biomaterials
- Mechanical properties
- Metals
- Microporous materials
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics