Effect of bilayer numbers on structural, mechanical, tribological and corrosion properties of TiO₂-SiO₂ multilayer film-coated β-type Ti45Nb alloys

Protective films with excellent tribological performance and good corrosion resistance are needed in general because titanium implants are used in aggressive environments and always suffer from severe wear and corrosion. In this study, TiO2-SiO2 multilayer films were deposited with different numbers of bilayers (2, 4, and 8) on beta-type Ti45Nb alloy substrates by physical vapour deposition. The influence of number of bilayers on microstructure, wettability, mechanical features, tribological performance and electrochemical behaviour of TiO2-SiO2 multilayer films were comparatively observed via XRD, XPS, SEM, AFM, nanoindentation tester, contact angle measurement system, reciprocating tribo-tester, and electrochemical corrosion media. The surface hardness, wear and corrosion resistance values of multilayer film-coated substrates were higher than the untreated substrate values. These properties and adhesion resistance and hydrophobicity of coated samples also increased with increase in number of bilayers due to the smaller grain size, increased layered interfaces and high structural density.

Journal

CERAMICS INTERNATIONAL

Year

2023

Volume

49

Issue

2

Pages

3007-3015

ISSN

0272-8842

eISSN

1873-3956

DOI

10.1016/j.ceramint.2022.09.285

WoS UID

WOS:000934002400001