Abstract
The studies on surface morphology of an anodically oxidized pure titanium and a titanium alloy (Ti-15V-3Cr-3Sn-3Al). as well as its changes during vacuum heat treatments, were carried out in order to obtain an improved bonding ability of the surfaces of these materials. The anodically oxidized titanium and the titanium alloy showed oxide films accompanied by the numerous holes and grooves, respectively. These oxide films included phosphorus which is a constituent of the solution used for the anodic oxidation. During the vacuum heat treatment at higher temperatures, such as 1173K, the oxide films disappeared by diffusion of oxygen atom into the titanium bulk which has a large oxygen solubility. At the same time, Ti3P particles were preferentially precipitated in the holes or grooves. It is worth to note that, these specimens showed appreciably higher bonding strength than the original materials polished by #150 polishing paper. Such an improvement of these specimens in bonding strength presumes to be the results of anchoring effects of the glue in the holes and grooves of the surfaces.
