Oxidative corrosion of adhesive interlayers
Abstract
The influence of excess oxygen on the interfacial bonding and adhesion at metal/ceramic boundaries was studied theoretically by means of electronic-structure calculations based on the local density functional theory. The model systems investigated were the weakly adhesive Ag(001)/MgAl2O4(001) interface and the interface Ag(001)/Ti/MgAl2O4(001), in which the reactive element Ti increases the strength of adhesion considerably. O insertion is exothermic at both interfaces due to a stabilising ion–ion interaction with the spinel surface. Ti reacts more readily than Ag even up to the formation of TiO. Ag shows a preference for Ag2O. However, the adhesion enhancement by the Ti interlayer is diminished by internal