Abstract
We investgated the spreading area of silver solder Ti at 800℃ or 900℃ using KHF2-LiF-NaCl-KCl fluxes and tested the joint strength of Ti bonded with resistance brazing.We also observed the surface of a fractured joint by SEM and analyzed a brazed joint with EPMA.When the concentration of NaCl+KCl was 0, 10, 20, 30, 40 and 50%, the spreading areas increased with increasing LiF/KHF2 and was the maximum at the ratio of 1.5 for 0% NaCl+KCl, 0.43〜0.46 for 10 to 40%, and 0.06〜1.5 for 50%.No significant differences in the joint strengths were obtained with the fluxes of the maximum spreading for any NaCl+KCl composition.The strength was also not significantly different with the LiF/KHF2 for 30% NaCl+KCl.TiCu and TiCu2 were found in the solder at the boundary of the joint. Fractures occurred near the boundary of the joints and the fracture surface was brittle. These fluxes had a broad effective range for the Ag solder-brazing of Ti with resistance brazing.
