181 0

Optimized fabrication and characterization of TiO2-Nb2O5-Al2O3 mixed oxide nanotube arrays on Ti-6Al-7Nb

Title
Optimized fabrication and characterization of TiO2-Nb2O5-Al2O3 mixed oxide nanotube arrays on Ti-6Al-7Nb
Author
Zal Nezhad, Erfan
Keywords
HIGH-ASPECT-RATIO; SIMULATED BODY-FLUID; BIOACTIVE TITANIUM METAL; IN-VITRO EVALUATION; TIO2 NANOTUBES; NB2O5 NANOTUBES; ELECTROCHEMICAL ANODIZATION; BIOMEDICAL APPLICATIONS; BIOMIMETIC APATITE; ANODIC-OXIDATION
Issue Date
2016-01
Publisher
ROYAL SOC CHEMISTRY
Citation
RSC ADVANCES, v. 6, NO 13, Page. 10527-10540
Abstract
Highly oriented arrays of TiO2-Nb2O5-Al2O3 mixed oxide nanotubes were fabricated via physical vapor deposition (PVD) to sputter a niobium film on Ti-6Al-7Nb (Ti67) and subsequent electrochemical anodization in ethylene glycol/ammonium fluoride/ionized water (5 wt%) electrolyte. Parametric optimization for higher adhesion strength and microhardness was conducted using Taguchi experimental design methodology. The highest adhesion strength and microhardness of the as-deposited Nb film was achieved at 350 W DC power, 20 sccm argon flow rate and a 90 V bias voltage. The microstructural features were found to depend on the anodization time and subsequent thermal treatment. The anodization of Nb/Ti67 for 4 h resulted in a homogeneous ordering of the mixed oxide nanotubes. Upon annealing at a low heating and cooling rate of 1 degrees C at 440 degrees C for 30 min in an atmospheric furnace, a highly ordered nanotube array contained a mixture of TiO2, Al2O3 and Nb2O5 phases, wherein the composition of the oxide nanotubes was strongly influenced by the chemistry of the phases present in Ti67. The results of in vitro bioactivity indicated that the crystallized mixed oxide nanotubes could induce a quick apatite formation after immersion in simulated body fluid (SBF). The above findings may contribute to the development of novel nanostructured materials for metallic orthopedic implants.
URI
http://pubs.rsc.org/en/Content/ArticleLanding/2016/RA/C5RA20493C#!divAbstracthttp://hdl.handle.net/20.500.11754/31735
ISSN
2046-2069
DOI
10.1039/c5ra20493c
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

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

BROWSE