ISSN 0004-881X

Formation of Anatase on the Surface of Cold Sprayed Titanium by Anodising

by C. Oh, S. Gulizia, M. Jahedi, C. Tang, S. Zahiri

CSIRO Materials Science and Engineering
Normanby Road, Clayton, Vic. 3168, Australia

Abstract

It has been shown from the literature that anodising of titanium produces the anatase phase of TiO₂ on the surface, which is capable of the photocatalytic inhibition of microbial adhesion under near-UV light illumination. Commercially pure titanium sheet (or titanium foil) has been used for test specimens in most of the research work published in the literature. In this work, the titanium test specimens were directly fabricated from titanium powder using cold spray technology. The formation of anatase on the surface of cold sprayed titanium specimens was investigated. The phases formed on the surface of anodised cold sprayed specimens were compared with those produced on anodised commercially pure titanium using glancing incidence X-ray diffraction technique. Small titanium coupons from commercially pure titanium sheet and cold sprayed titanium were prepared and anodised in an orthophosphoric acid solution at 30V for 24hrs. Some of anodised specimens were heat treated at 300 deg C for 3hrs and 500 deg C for 3hrs in air to investigate phase change at high temperatures. It was identified from this study that anatase was formed on the surface of cold sprayed titanium as well as on the commercially pure titanium sheet. The anatase phase was stable up to 300 deg C. However, at 500 deg C significant quantities of the rutile phase was identified on both specimens.

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