Fabrication of TiO₂/SiO₂ Composite Coating via a High-Temperature Self-Organizing Porous TiO₂ Layer on Ti

Abstract

We studied the fabrication of a TiO 2 /SiO 2 composite coating on Ti. At a temperature above 1100 K with oxygen partial pressure, a self organized coating of rutile phase TiO 2 is formed on a Ti substrate. The thick TiO 2 coating > 10 m had a piecrust like multilayer structure, which comprise TiO 2 monolayers and gaps. A composite coating containing SiO 2 was fabricated via a sol gel method in vacuum to improve the exfoliation strength of the brittle, porous TiO 2 coating. Cross sectional SEM images revealed sufficient amounts of SiO 2 in the gaps between the TiO 2 monolayers in the TiO 2 /SiO 2 composite coating, even at the interface between the oxide coating and the substrate. Exfoliation stress of the composite coating was up to 10 -15 times higher than for the self organized TiO 2 coating alone, and the composite coating s failure mode was interfacial compared with cohesive for the self organized TiO 2 coating. doi:10 2320/jinstmet.J2017050 Received October 27, 2017; Accepted December 26, 2017; Published February 16, 2018 Keywords: titanium (Ti), titanium dioxide, vacuum sol-gel method, composite material, dental Cross sectional SEM images revealed composite coating, even at the interface composite coating, even at the interface between the oxide coating and the substrate. Exfoliation stress of the composite coating was up to 10 -15 times higher than for the coating alone, and the composite coating s failure mode was interfacial compared with cohesive for the self

Effect of Nb addition on high-temperature oxidation behavior, oxide layer structure, and its exfoliation resistance of Ti-Nb Alloys

“…Since the structure contains multiple void layers, fracture occurs easily at the void layer by the external force, and the exfoliation stress is as low as about 2 ~ 4 MPa [1,4]. However, by introducing a reinforcing material such as SiO 2 glass into the void layer, it is possible to improve the exfoliation stress to about 15 ~ 20 MPa which is durable for practical use [7,8]. The oxide layer formed on the TNTZ alloy is shown in Fig.…”