TLP brazing of titanium and steel using silver-copper-filler deposited by arc-PVD process

摘要

The application of hybrid material concepts in various fields of engineering becomes increasingly important. In this regard, single material systems using well known engineering materials like titanium or steel cannot satisfy the requested technical standards anymore. Therefore, adequate manufacturing processes are required in order to provide hybrid concepts with tailored properties. Within the presented investigations, brazing of commercially pure titanium (CP Ti) and austenitic CrNi-steel (1.4301) was performed in a high-vacuum furnace using thin silver-copper-films deposited by arc-PVD technique as filler metal. The samples were brazed at 850 and 880℃ with varying dwell times of 30 and 60 min. The microstructure and phase constitution of the bonded joints were analyzed by means of metallography, scanning electron microscope (SEM) and energy dispersive X-ray (EDX). The experimental results showed that sound joints with a good wetting quality, lack of pores and cracks can be achieved. Intermetallic phases were predicted from the chemical analyses. The mechanical properties of brazed joints were determined using measurements of hardness and shear strength. The maximum strength could be obtained for the joint at 880℃ and 60 min dwell time due to better coalescence of the mating surfaces.