Fabrication of Nano-structured HA/CNT Coatings on Ti6Al4V by Electrophoretic Deposition for Biomedical Applications
Bokai Zhang1; Chi Tat Kwok1; Fai Tsun Cheng2; Hau Cheung Man3
Conference Name2010 3rd International Nanoelectronics Conference (INEC)
Source PublicationJournal of Nanoscience and Nanotechnology
Conference Date3-8 Jan. 2010
Conference PlaceHong Kong, China

In order to improve the bone bioactivity and osteointegration of metallic implants, hydroxyapatite (HA) is often coated on their surface so that a real bond with the surrounding bone tissue can be formed. In the present study, cathodic electrophoretic deposition (EPD) has been attempted for depositing nanostructured HA coatings on titanium alloy Ti6Al4V followed by sintering at 800 °C. Nano-sized HA powder was used in the EPD process to produce dense coatings. Moreover, multiwalled carbon nanotubes (CNTs) were also used to reinforce the HA coating for enhancing its mechanical strength. The surface morphology, compositions and microstructure of the monolithic coating of HA and nanocomposite coatings of HA with different CNT contents (4 to 25%) on Ti6Al4V were investigated by scanning-electron microscopy, energy-dispersive X-ray spectroscopy and Xray diffractometry, respectively. Electrochemical corrosion behavior of the various coatings in Hanks' solution at 37 °C was investigated by means of open-circuit potential measurement and cyclic potentiodynamic polarization tests. Surface hardness, adhesion strength and bone bioactivity of the coatings were also studied. The HA and HA/CNT coatings had a thickness of about 10 μm, with corrosion resistance higher than that of the substrate and adhesion strength higher than that of plasma sprayed HA coating. The properties of the composite coatings were optimized by varying the CNT contents. The enhanced properties could be attributed to the use of nano-sized HA particles and CNTs. Compared with the monolithic HA coating, the CNT-reinforced HA coating markedly increased the coating hardness without deteriorating the corrosion resistance or adhesion strength. 

KeywordCarbon Nanotube Electrophoretic Deposition Hydroxyapatite Metal Implants Nanocomposite Coating
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Document TypeConference paper
CollectionUniversity of Macau
Affiliation1.Department of Electromechanical Engineering, University of Macau
2.Department of Applied Physics
3.Department of Industrial & Systems Engineering, The Hong Kong Polytechnic University, China
First Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
Bokai Zhang,Chi Tat Kwok,Fai Tsun Cheng,et al. Fabrication of Nano-structured HA/CNT Coatings on Ti6Al4V by Electrophoretic Deposition for Biomedical Applications[C]:IEEE,2011:10740-10745.
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