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5397 |
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Wednesday, June 07, 2017, Hall 14 12:10 PM Medical Industry I |
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Functionalized coatings by cold gas spray for biomedical applications |
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Nuria Cinca / University of Barcelona, Spain Anna M. Vilardell / Thermal Spray Centre (CPT). Universitat de Barcelona. , SPAIN Irene G. Garcia Cano*/ University of Barcelona, Spain Sergi Dosta/ Thermal Spray Centre (CPT). Universitat de Barcelona. , SPAIN Josep M. Guilemany/ Thermal Spray Centre (CPT). Universitat de Barcelona. , SPAIN |
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The cold spray technology has been lately studied to produce coatings for the biomedical industry since the use of conventional technologies requires high temperatures and vacuum conditions to spray oxygen and temperature-sensitive materials. The present work is aimed at presenting porous and rough titanium coatings for cementless prosthesis, as well as the top deposition of a bioactive layer either obtained by an alkaline treatment or deposition of hydroxyapatite, HA. The titanium coating was optimized to overcome the mechanical ASTM standard specifications. The deposition of a ceramic like HA by cold spray has been challenging due to the low deformability of this material but it has been observed that depending on the feedstock powder structure, the build up of the layer can be more feasible. Thus, sintered powders are able to deposit just as a monolayer by the cracking and crushing of the impinging particles, while nanoagglomerated powders allow higher deposition efficiencies through the compaction of the crystallites. The top surface morphology resulting from the different coating systems will be determinant for cell adhesion since the topographic features are very different; in this terms, the use of sintered powders leads to submicrometric grains while the alkaline treatment and the use of agglomerated powders results in nanofeatured morphologies. |