Brazing of Titanium with New Biocompatible Brazing Filler Alloys

摘要

Brazing of titanium with new biocompatible brazing filler alloys, using resistance brazing techniques, was investigated for biomedical applications. Several titanium and zirconium based alloys, with iron or manganese as an alloying agent to reduce the liquidus temperature were used. Brazing was conducted at temperatures from 900 to 1300°C and for 30, 60 and 90 seconds in an argon insert gas atmosphere with cp-Ti grade 2 samples. The brazing fillers were used as pastes, made by mixing the powdered alloys with an organic carrier. The influence of a vacuum annealing step below the α/β transition temperature (6 h) / 800°C) following the brazing procedures was also investigated in order to obtain a better distribution of the alloying elements. The microstructure of the joints was metallographically examined. The influence of the brazing time and brazing temperature could also be explained by the development of the microstructure. The solidus and liquidus temperatures and the wetting and erosion behaviour of the brazing filler alloys were also determined.