《Table 2 EDS point analysis of Ag-Cu-2Ti in Fig.4a (at%)》

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《Ti活度对Al_2O_3/Ag-Cu-Ti/Fe-Ni-Co钎焊接头力学性能和微观组织结构的影响（英文）》

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The increase of Ti content and decrease of Cu content in the brazing alloy，such as Ag-Cu-4Ti，can increase the activity of Ti to 0.939 listed in Table 5.Under this conditions，much more Ti atoms diffuse to the interface between the brazing alloy and Al2O3 ceramic，which may decrease the reaction severity of Ti-Cu；therefore，Ti-Cu intermetallic compounds such as Cu3Ti are formed in the brazing zone and the thickness of the reaction layer increases compared to that of Ag-Cu-2Ti.Consequently，the phase composition in the reaction layer is transformed to Ti3O5 and Ti Al.With the addition of 8 wt%Ti in the Ag-Cu based brazing alloy（Ag-Cu-8Ti），the thermodynamic activity of Ti in the alloy is raised to~1 listed in Table 5，and therefore，the thickness of reaction layer“A”increases to a maximum value.On this occasion，the reaction layer“A”is mainly composed of Ti O and Ti3Al.From these results，it can be concluded that the reaction product in the reaction layer is determined by the activity in the molten brazing alloy，which is dependent on the brazing temperature and the content of Ti and Cu.