MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Fabrication of TiO2/SiO2 Composite Coating via a High-Temperature Self-Organizing Microporous TiO2 Layer on Ti
Eri Miura-FujiwaraYoshinobu TanakaHiroshi HaradaTakeyuki KikuchiThoru Yamasaki
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2016 Volume 57 Issue 12 Pages 2008-2014

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Abstract

We studied the fabrication of a TiO2/SiO2 composite coating on Ti. At a temperature above 1100 K with oxygen partial pressure, a self-organized coating of rutile phase TiO2 is formed on a Ti substrate. The thick TiO2 coating (> 10 μm) had a “piecrust-like” multilayer structure, which comprise TiO2 monolayers and gaps. A composite coating containing SiO2 was fabricated via a sol-gel method in vacuum to improve the exfoliation strength of the brittle, porous TiO2 coating. Cross-sectional SEM images revealed sufficient amounts of SiO2 in the gaps between the TiO2 monolayers in the TiO2/SiO2 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 TiO2 coating alone, and the composite coating's failure mode was interfacial compared with cohesive for the self-organized TiO2 coating.

Fig. 1 Basic concept of SiO2/TiO2 composite coating fabrication using a vacuum sol-gel method. Top: piecrust-like TiO2 coating made via high-temperature oxidation on Ti; middle: after implantation of SiO2 gel; bottom: TiO2/SiO2 composite coating after sintering. Fullsize Image
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© 2016 The Japan Institute of Metals and Materials
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