Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/12572
Title: Characterization and corrosion studies of titania-coated NiTi prepared by sol-gel technique and steam crystallization
Authors: Chiu, KY
Wong, MH
Cheng, FT
Man, HC 
Keywords: Corrosion resistance
Crystallization
NiTi
Sol-gel coating
TiO2
Issue Date: 2007
Publisher: North-Holland
Source: Applied surface science, 2007, v. 253, no. 16, p. 6762-6768 How to cite?
Journal: Applied surface science 
Abstract: Nickel titanium (NiTi) was dip-coated with titania via the sol-gel route using titanium butoxide (Ti(OC4H9)4) as precursor. The as-coated titania film was crystallized to form anatase by treatment in steam at 105 °C. The crystallized film was relatively thick (about 750 nm) and even. Atomic force microscopy (AFM) revealed that the film was dense with a surface roughness of about 3 nm, and was composed of particles of about 100 nm. X-ray diffractometry (XRD) showed that these particles were composed of nanocrystallites of a few nanometers. Nanoindentation tests of the titania film indicated that the film was tough, possibly due to the nano-size of the crystallites. The mean hardness H and elastic modulus E of the coating were about 1.5 and 70 GPa, respectively. Direct pull-off test recorded a mean coating-substrate bonding strength larger than 17 MPa. Electrochemical impedance spectroscopic (EIS) study and cyclic polarization tests showed that the corrosion resistance of the coated NiTi samples in Hanks' solution was increased by about two orders of magnitude compared with the substrate. Taken together, the present study showed that steam crystallization is a feasible low-temperature treatment method for sol-gel derived titania coating on NiTi in biomedical applications.
URI: http://hdl.handle.net/10397/12572
ISSN: 0169-4332
EISSN: 1873-5584
DOI: 10.1016/j.apsusc.2007.01.121
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

40
Last Week
0
Last month
0
Citations as of Sep 8, 2017

WEB OF SCIENCETM
Citations

35
Last Week
0
Last month
0
Citations as of Sep 20, 2017

Page view(s)

36
Last Week
1
Last month
Checked on Sep 18, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.