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Evaluation of Wetting and Intermetallic Formation on alumina to titanium Gold Based Brazing
Keywords: Brazing, titanium, cofired alumina
Platinum pin/alumina/titanium feedthrough assemblies have been used for many years in implantable devices. However, new devices, especially neural stimulators, require much higher outputs This work evaluates the braze process required to braze a high temperature cofired alumina feedthrough assembly to a titanium housing. Brazing of thin film coated alumina ceramic with CP titanium by pure gold. Vacuum brazing was done by resistance heating using a tantalum heating element. The alumina was metalized with a thin film adhesion layer by thin film deposition. The interaction of both the gold alloys with titanium and various thin film adhesion layers was evaluated for intermetallic formation, wetting and dissolution. These reactions and resulting microstructures were characterized by transmission electron microscopy using FIB extracted thin sections, SEM and EDS.
Shadab Saddiqui , Ph.D. Candidate
Florida International University
Miami, FL

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