Characterization of a new polysiloxane-based titanium surface treatment for resin titanium bonding

Abstract

Purpose: To characterize the polysiloxane-coated titanium surface with thermal treatment by XPS and AFM. Such a novel coating might significantly enhance resin bonding. Methods and materials: A layer (∼2mm) of silicone grease (Dow Corning Co., Michigan, USA) was applied on two titanium plates (Permascand, Ljungaverk, Sweden) followed by a thermal treatment at two temperatures, 800 and 1100 ◦C, respectively. Another titanium plate was surface treated by sandblasting. The atomic composition of titanium surfaces and change of chemical states of Ti2p, Si2p and O1s were examined by X-ray photoelectron spectroscopy (XPS). The surface morphology and surface roughness were examined by atomic force spectroscopy (AFM). Results: Change in binding energies for Si2p and O1s peaks were observed after surface treatment by sandblasting and a polysiloxane coating with thermal treatment (Table 1). No observable changes in binding energies for Ti2p was obtained. There was a change in atomic composition of titanium surfaces after different surface treatments. There were changes in surface morphology of titanium after surface treatments. The average surface roughness, Ra (m), of titanium was increased after sandblasting and thermal treated of polysiloxane-coating: polished (0.179 ± 0.027), sandblasted (0.642 ± 0.033), polysiloxane-coated at 800 and 1100 ◦C (0.316 ± 0.056 and 0.898 ± 0.064). Conclusion: Both the physical and chemical characteristics of the titanium surfaces were changed by the surface modification using a polysiloxane coating with thermal treatment. These changes on the titanium surface might affect the resin titanium bonding.