Synthesis Characterization and Properties of Ti Zr Cu Ni Based Metallic Glasses and Their Use as Filler Materials for Brazing Joints

Abstract

Development of brazing materials for joining titanium based alloy is a current topic of newlineinterest due to the expanding use of these alloys in aerospace, chemical apparatuses, heat newlineexchangers etc. The Ti based brazing alloys as filler materials are generally brittle and are newlineused in the form of powders, pastes, sprays which will be spread prior to the joining newlineoperation. This may lead to porous joint because of the entrapped air in the powder. The main newlineproblem in the brazing of titanium is the formation of brittle intermetallic compounds newlinebetween titanium and filler metal elements at the base metal-filler metal interface resulting in newlinebrittle joints and high galvanic corrosion. The above problem can be overcome by using newlineamorphous titanium-zirconium-based alloys in the form of ribbons produced through melt newlinespinning technique. They possess several advantages over the conventional crystalline filler newlinematerials such as better diffusivity of elements in amorphous state, good ductility, newlinecompositional homogeneity, accelerated interfacial reaction by improving wetting conditions newlineetc. Therefore, the usage of fluxes (which modify the wetting properties) can be avoided and newlinecleaner joints can be achieved. newline