Selective laser sintering/melting of nitinol–hydroxyapatite composite for medical applications
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The layer-by-layer synthesis of 3D parts from nitinol (NiTi intermetallide) and hydroxyapatite additions using selective laser sintering/melting (SLS/SLM) is studied. The effect of different laser parameters on the structure and phase composition of sintered/melted samples is analyzed with optical and scanning electron microscopy, x-ray diffraction, and energy-dispersive x-ray analysis. Optimum SLS/SLM parameters are determined for the synthesis of NiTi + HA to be used in tissue engineering and manufacture of medical devices (pins, nails, porous implants, drug delivery systems). No significant destruction of HA ceramics under laser treatment is observed. The amount of nickel released to the surface of 3D parts decreases owing to the additional oxidation of free titanium during SLS/SLM and the formation of a protective HA layer. Full-density 3D parts are produced from nitinol by SLM including preheating to 300°C.
Keywordsselective laser sintering/melting (SLS/SLM) porous tissue engineering nitinol hydroxyapatite (HA)
The research has been sponsored through the Russian Fundamental Research Fund (Project No. 10-08-00208-a) and a grant under the Program “Fundamental Sciences for Medicine” (Stages 2009–2011) of the Presidium of the Russian Academy of Sciences.
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