Effect of oxygen on segregation and chemical activity of titanium in silver-copper brazing alloys

Thermodn. of Ti-O interaction in the Ti-Al2O3 diffusion couples and in liq. Ag-Cu alloys were studied. In spite of strong Ti-O interaction in the Ti-Al2O3 diffusion couples Ti-oxides are not formed due to dissolved aluminum. Results indicate that there is a large liq. miscibility gap in the Ag-Cu-Ti system, which divides the liq. into high-Ti and low-Ti, high Ag solns. In Ag-rich Ag-Cu-Ti alloys a-Ti[O] or lower Ti-oxides may form due to high oxygen and Ti activities. Several other phase equil. and the isoactivities of dissolved Ti and O in both systems are presented. The present thermodn. description gives a good basis for further studies on chem. interactions in diffusion bonded or in brazed oxide-metals joints. [on SciFinder (R)