Abstract
Effects of active filler metal composition on the shear strength and reaction products of Al2O3-Hovar joints were studied. The variation of microstructures of reaction products formed at the interface between Al2O3 and active filler metal was investigated by scanning electron microscopy, auger electron microscopy.
Increasing of Cu component in the active filler metal (Ag-35mass%Cu-2mass%Ti) improves shear strength about 210-240MPa of Al2O3-Kovar joints brazed at 1123K for 900s and thickness change of active filler metal do not influenced on the shear strength of Al2O3-Kovar joint.Reaction layer Ti2.9 (Cu, Al) 1.9O1.3 were formed in the interface between active filler metal and Al2O3. High shear strengh of Al2O3-Kovar joints are attributed to the formation of these reaction layers.
