Mechanical Property Enhancement of Ti-6Al-4V by Multilayer Thin Solid Film Ti/TiO 2 Nanotubular Array Coating for Biomed
- PDF / 1,741,604 Bytes
- 13 Pages / 593.972 x 792 pts Page_size
- 15 Downloads / 160 Views
ITANIUM and its alloys exhibit the most suitable characteristics for biomedical applications owing to their high biocompatibility, specific strength, and corrosion resistance.[1] They are currently utilized as metallic structural biomaterials in implants such as artificial hip joints and dental roots; they are mainly used in implants that replace hard tissue. They are also required to possess high strength and long fatigue life, that is, high fatigue strength. Nowadays, a low Young’s modulus equivalent to that of cortical bone is simultaneously required in order to inhibit bone absorption.[2] Porous titanium and its alloys have also been developed for the fabrication of titanium alloys with low Young’s modulus. In addition, functionalities such as superelasticity ERFAN ZALNEZHAD, is with the Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50630 Kuala Lumpur, Malaysia, and also with the Faculty of Engineering, Islamic Azad University, Chalous Branch, Iran. Contact e-mail: [email protected]. my SAEID BARADARAN, Ph.D. Student, and A.R. BUSHROA, Senior Lecturer, are with the Department of Mechanical Engineering, Faculty of Engineering, University of Malaya. AHMED A.D. SARHAN, Senior Lecturer, is with the Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, and also with the Department of Mechanical Engineering, Faculty of Engineering, Assiut University, Assiut 71516, Egypt. Manuscript submitted April 10, 2013. Article published online October 23, 2013 METALLURGICAL AND MATERIALS TRANSACTIONS A
and shape memory characteristics are currently essential for titanium alloys used in biomedical applications. The mechanism of superelastic behavior of some titanium alloys in biomedical applications is still unknown.[3] Wear loss occurs, for example, between the stem and bone, along with loosening. There is a possibility of fretting fatigue taking place in the contact area of two bodies, for example, between the bone plate and screw. Therefore, the wear and fretting fatigue characteristics are also very important factors for titanium alloys employed in biomedicine.[1,2] Young’s modulus as well as tensile strength, ductility, fatigue life, fretting fatigue life, wear properties, functionalities, etc., should be controlled in such a manner that they are at levels suitable for structural biomaterials in implants that replace hard tissue. These factors may be collectively referred to as mechanical biocompatibilities in a broader sense. Several sorts of coatings exist with the potential to develop the mechanical properties of metallic materials. Some methods such as chemical vapor deposition (CVD), hard anodizing (HA), plasma spray, physical vapor deposition (PVD), electrophoretic, dipping and electrochemical deposition, pulsed laser deposition, ion beam dynamic mixing, and ion beam deposition have been explored with respect to improving thin coatings of metals.[4–11] However, a number of these techniques have limitations like poor adhesion, microcracks, phase VOLUME 45A, FEB
Data Loading...
