研究目的
Developing an alternative approach for printing integrated communication system on implants, in order to endow the implant with intrinsic capacities.
研究成果
The micro-wires produced by laser technology presented low electrical resistance values, comparable with the wire printed on the zirconia substrate. Laser demonstrated to be a competitive approach to oxidizing the surface and also for consolidating the micro-wires on Ti6Al4V surface.
研究不足
The main issue about laser sintering is related to a very steep temperature gradient that is generated due to the fast heating and cooling rate during the process. This can lead to convective motions and high internal stresses, resulting in delamination and cracks formation.
1:Experimental Design and Method Selection:
Laser technology was applied as a versatile tool for preparing the surface of Ti6Al4V in a subtractive way, by creating micro-cavities, or for printing smart components, in an additive way. Laser was also applied for thermal-chemical treatments, by creating an oxide layer to act as electrical insulation of communication wires.
2:Sample Selection and Data Sources:
Ti6Al4V titanium alloy target was used to produce micro-cavities. Silver powder was used to print micro-wires.
3:List of Experimental Equipment and Materials:
Nd:YAG laser (OEM Plus), SEM (FEI Nova 200), XRD (Bruker D8 Discover), AFM (Bruker), silver powder (≥99% pure, Metalor Technologies-USA).
4:Experimental Procedures and Operational Workflow:
Micro-cavities were produced by laser scanning. Silver powder was deposited and compacted into the cavities. Two techniques were performed to consolidate the powder: laser sintering (LS) and hot-pressing (HP).
5:Data Analysis Methods:
Electrical measurements were performed using the four-point probe method. The morphology of the oxidized films was analyzed using SEM and the phase composition was analyzed by XRD.
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