Abstract
Bonding of Al2O3 coated with Cu2O+Cu obtained by vacuum vaporized deposition of Cu in O2 flow to steel using Ag-Cu-Ti brazing filler metal was proposed and its joint properties were investigated.
Spreadability of Ag-Cu-Ti brazing filler metal to Al2O3 coated with Cu2O+Cu was investigated in a vacuum furnace in comparison with no treated Al2O3.
Metallurgical joint properties of bonding of Al2O3 to steel (29Ni-16Co steel) using this proposed method were observed with XPS analyser.
From spreadability test, it was found that excellent spreadability of Ag-Cu-Ti brazing filler metal to Al2O3 was obtained in Cu2O+Cu coated Al2O3.
XPS revealed that joint fracture occured in Ag-Cu layer containing TiO2, Cu2O, CaO and TiO2, Cu2O existed at bonding interface of Al2O3.
It was suggested that joint properties were affected with Ag-Cu layer containing TiO2, Cu2O, CaO and bonding was due to oxide reaction between TiO2, Cu2O in Ag-Cu layer and Al2O3 containing SiO2, CaO fluxing oxides.
