About the Structure Cu-Al₂O₃ Joints Obtained by Diffusion Bonding

Abstract

The joint copper-alumina obtained at a solidification condition of Cu/Cu2O eutectic was studied. Experiments involved many different techniques, such as scanning electron microscopy (SEM), X-ray diffractometry, X-ray microanalysis, and transmission electron microscopy (TEM). It was observed that a thin inhomogeneous interfacial layer is present between Cu and Al2O3 ceramics and it consists of two sublayers: the first is nanocrystalline complex oxide CuAlO2. This layer changes progressively into a crystalline CuAl2O4 sublayer. A model of liquid phase bonding between copper and alumina is proposed.

Controlling the density of CNTs by different underlayer materials in PECVD growth

“…It is also suspected that there was some reaction between Cu and Al2O3, and several papers [19], [20], [21], [22] researching into the Cu-Al2O3 interface verify our guess in figure 4. It is discussed that there are several new species of substance between the interface, such as CuAlO2 and CuAl2O4 during high temperature which can be reached during the CNT growth.…”

Rotary friction welding of Al/Al2O3 Composites with Aluminium Alloys

“…This problem is difficult due to the high hardness and brittleness of composite materials [8,9]. Thus, obtaining a high-quality metal-composite joint comes down to shaping an appropriate transition layer between these materials [10,11].…”