Akademik Veri Yönetim Sistemi
Journal Of Biomechanics, cilt.43, ss.56-57, 2010 (SCI-Expanded)
M-13
Determination of Wear Behaviour of Titanium Alloys Implant
Materials Blasted With Mixture of Zirconia/Silica/Hydroxyapatite
Powders
A.B. Hazar1, D. Uzunsoy1, H. Ek ¸sio˘glu1, O. Sen1, H. Demir1, V. Om ¨url ¨u ¨ 1, A. Koyun1.
1Yıldız Technical University, Turkey
Titanium (Ti) and titanium alloys are widely used in biomedical
applications as well as in cardiac and cardiovascular applications,
Oral and Poster Presentations / Journal of Biomechanics 43S1 (2010) S23–S74 S57
especially as hard tissue replacements, because of their desirable
properties, such as relatively low modulus, good fatigue
strength, formability, machinability, corrosion resistance, and
biocompatibility. However, titanium and its alloys cannot meet
sufficiently all of the clinical requirements. Therefore, in order to
improve the biological, chemical, and mechanical properties, surface
modification is often performed. In recent years, many research
efforts have been concentrated on the development of surface
modification techniques like mechanical, laser, thermal, sol–gel,
chemical and electrochemical treatments etc. for titanium and its
alloys [1]. Recent works have shown that the wear resistance,
corrosion resistance, and biological properties of titanium and
titanium alloys can be improved selectively by appropriate surface
treatment techniques while the desirable bulk attributes of the
materials are retained [2].
Ti6Al4V alloy has been widely used as a suitable material for
surgical implants such as artificial hip joints. These materials
possess outstanding corrosion resistance due to a dense and passive
oxide film on the surface. Although this alloy is biocompatible,
its wear resistance is inadequate. Therefore, grid-blasting method
as one of the mechanical modification techniques is used to
obtain specific surface topographies and roughness, remove surface
contamination, improve the mechanical and biological adhesion in
hard tissues. The blasting materials like alumina (Al2O3), zirconia
(ZrO2), silica (SiO2), hydroxyapatite (HA) etc. are frequently used
as a blasting media to obtain improved surface properties. The
blasting process applied for the surface properties of titanium based
implant materials is widely used in medical applications. Nowadays,
ZrO2/SiO2 and HA blasting powders are performed extensively, the
surfaces of Ti-based implant materials to modify surface topography
and to improve biocompatibility of the Ti-based implant materials.
In this study, the surfaces of Ti6Al4V (Grade 5) samples are blasted
by different ratio of ZrO2/HA powders. The blasted samples are
characterized by several techniques such as scanning electron
microscopy (SEM) with energy dispersive X-ray (EDX), X-ray
diffractiometry (XRD), X-ray fluorescence spectrometry (XRF), and
profilometry. The blasting process leads to an improvement in the
chemical, topographical and biocompatibility characteristics of the
samples. The dry sliding wear test of the samples is performed using
pin-on disc equipment. The worn surfaces are characterized by SEM
to determine the wear characteristic of Ti-based blasted material.
Reference(s)
[1] Xuanyong Liu, Paul K. Chu, Chuanxian Ding, “Surface modification
of titanium, titanium alloys, and related materials for biomedicals
applications”, Materials Science and Engineering: R: Reports 47(3–4):
pp. 49–121.
[2] Yukari Iwaya, Miho Machigashira, Kenji Kanbara, Motoharu Miyamoto,
Kazuyuki Noguchi, Yuichi Izumi and Seiji Ban, “Surface Properties and
Biocompatibility of Acid-etched-Titanium”, Dental Materials Journal
2008; 27(3): pp. 415–421.