A comparative study of apatite coating and apatite/collagen composite coating fabricated on NiTi shape memory alloy through electrochemical deposition

2011 ◽  
Vol 65 (17-18) ◽  
pp. 2575-2577 ◽  
Author(s):  
Tao Sun ◽  
Wing-Cheung Lee ◽  
Min Wang
Keyword(s):  
Shape Memory Alloy ◽  
Comparative Study ◽  
Shape Memory ◽  
Composite Coating ◽  
Electrochemical Deposition ◽  
Niti Shape Memory Alloy ◽  
Apatite Coating

Fabrication of an Apatite/Collagen Composite Coating on the NiTi Shape Memory Alloy through Electrochemical Deposition and Coating Characterisation

2009 ◽  
Vol 618-619 ◽  
pp. 319-323 ◽  
Author(s):  
Parama Chakraborty Banerjee ◽  
Tao Sun ◽  
Jonathan H.W. Wong ◽  
Min Wang
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Composite Coating ◽  
Electrochemical Deposition ◽  
Room Temperature ◽  
Composite Coatings ◽  
Deposition Process ◽  
Niti Shape Memory Alloy ◽  
X Ray ◽  
Niti Sma

To improve the biocompatibility and bioactivity of NiTi shape memory alloy (SMA), apatite/collagen composite coatings were fabricated on the surface of NiTi SMA at room temperature using the electrochemical deposition technique. Spherical apatite particles and fibrous collagen that formed the composite coating were visible under scanning electron microscope (SEM). The Ca/P ratio of the apatite component in the coating, as determined by energy dispersive X-ray spectroscopy (EDX), was about 1.38 which is slightly higher than that of octocalcium phosphate (OCP). X-ray diffraction result showed that the apatite was amorphous, which was due to the low temperature (i.e., room temperature) deposition process. The structure of the composite coatings was further characterized using Fourier transform infrared reflection spectroscopy (FTIR). It was also found that, compared to bare NiTi SMA samples, the wettability of as-deposited samples was increased because of the formation of the composite coating.

Electrochemical Deposition of Apatite/Collagen Composite Coating on NiTi Shape Memory Alloy and Coating Properties

2009 ◽  
Vol 1239 ◽  
Author(s):  
Min Wang ◽  
Tao Sun
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Composite Coating ◽  
Electrochemical Deposition ◽  
Composite Coatings ◽  
Surface Characteristics ◽  
Corrosion Current ◽  
Niti Shape Memory Alloy ◽  
Niti Sma ◽  
Transmission Electron

AbstractIn this investigation, an apatite/collagen composite coating was formed at 37C on a NiTi shape memory alloy (SMA) through electrochemical deposition using double-strength simulated body fluid (2SBF) which contained dissolved collagen. Surface characteristics, wettability and stability of the composite coating were subsequently studied. Scanning electron microscope (SEM) examination of the surface of composite coatings revealed that many collagen fibers were embedded in apatite with flake-like structure and apatite nanocrystals nucleated and grew on collagen fibrils. Energy dispersive X-ray (EDX) spectroscopy analysis showed that the Ca : P ratio of the composite coating was about 1.35, which is close to that of octocalcium phosphate. Transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR) analysis were also conducted for the composite coating. Compared to bare NiTi SMA samples, the potentiodynamic polarization curves of NiTi SMA samples with the composite coating displayed lower corrosion current density, more positive corrosion and breakdown potential, suggesting that the composite coating was chemically stable and provided corrosion resistance for NiTi SMA.

Characteristics and in vitro biological assessment of (Ti, O, N)/Ti composite coating formed on NiTi shape memory alloy

2011 ◽  
Vol 519 (15) ◽  
pp. 4623-4628 ◽  
Author(s):  
Tao Sun ◽  
Lang-Ping Wang ◽  
Min Wang ◽  
Ho-Wang Tong ◽  
William W. Lu
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Composite Coating ◽  
Biological Assessment ◽  
Niti Shape Memory Alloy

Biomimetic deposition process of an apatite coating on NiTi shape memory alloy

2006 ◽  
Vol 60 (24) ◽  
pp. 3002-3006 ◽  
Author(s):  
C.L. Chu ◽  
Y.P. Pu ◽  
L.H. Yin ◽  
C.Y. Chung ◽  
K.W.K. Yeung ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Deposition Process ◽  
Niti Shape Memory Alloy ◽  
Apatite Coating ◽  
Biomimetic Deposition

Formation of bonelike apatite–collagen composite coating on the surface of NiTi shape memory alloy

2006 ◽  
Vol 54 (1) ◽  
pp. 89-92 ◽  
Author(s):  
Cai Yanli ◽  
Liang Chunyong ◽  
Zhu Shengli ◽  
Cui Zhenduo ◽  
Xianjin Yang
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Composite Coating ◽  
Niti Shape Memory Alloy ◽  
Bonelike Apatite
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