The Influence of the Reaction Time in the Micro-Arc Oxidation Process on the Microstructure of the Coatings Deposited on Ti6Al7Nb Alloy

Abstract:

Surface modifications of titanium based biomaterials are of great importance in medical field. In case of permanent implant coatings with bioactive properties are claimed to improve bone-implant connection stability. In the present study the micro-arc oxidation (MAO) is proposed as a method to modify the Ti6Al7Nb alloy surface by depositing porous and rough titanium dioxides layers with incorporated calcium phosphates. The effect of the reaction time on the microstructure of the formed coatings was investigated by means of scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM and SEM-EDS, respectively). The change in coatings thickness was observed, from initial 4-6 μm after 30 seconds of MAO treatment to final 38-44 μm after 10 minutes surface processing. By application of the electrolyte containing calcium and phosphorous ions it was possible to prepare coatings with the outer layer consisted mainly from calcium phosphates. Such phase composition together with rough and porous structure provides the perspective surface for cells attachment and ingrowth to create strong connection between implant and bone tissue.

• Periodical: Key Engineering Materials (Volume 687)
• Pages: 106-110
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.687.106
• Online since: April 2016
• Authors: Joanna Karbowniczek*, Sara Metwally, Grzegorz Cempura, Aleksandra Czyrska-Filemonowicz
• Keywords: Calcium Phosphates, Coatings, Micro-Arc Oxidation, Titanium Alloys

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