Performing a Calcium-Phosphate Layer on Porous NiTi Alloy for Using in Orthopedic Applications

Subject Areas :

Nahid  Hasanzadeh ¹ (Assistant Professor, Department of Mechanical Engineering, Islamic Azad University, Science and Research Branch, Tehran,)
Sayed Khatibolah  Sadrnezhad ² (Professor, Department of materials science and engineering, Sharif University of Technology)
Negar  Afra ³ (M.Sc. Student, Department of Mechanical Engineering, Islamic Azad University, Science and Research Branch, Tehran)

Received: 2015-11-24 Accepted : 2015-11-24 Published : 2013-11-01

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Abstract :

Porous NiTi alloys has a series of unique properties such as shape memory effect, superelastic behavior and energy absorbability that make them usable in a wide range of medical and industrial appliances. But the more probability of Ni release from a porous NiTi compare to the nonporous one has restricted it’s uses in implants. In the present research for resolving the problem, performing a calcium-phosphate layer on an Iranian porous alloy was considered. For this purpose all of the samples were immersed in SBF for 3 and 5 days. Some of them passed the dipping in SBF stage after 30% HNO3 and 1.2 M NaOH solution treatments. All the samples were characterized using SEM equipped with EDS and light microscopy. The results show that the chemical treated samples had better and more uniform calcium-phosphate layer forming ability than the untreated ones. The obtained results could be used in orthopedic applications.