Fabrication of nano-structured HA/CNT coatings on Ti6A14V by electrophoretic deposition for biomedical applications

Bokai Zhang, Chi Tat Kwok, Fai Tsun Cheng, Hau Chung Man

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

3 Citations (Scopus)

Abstract

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 Ti6A14V followed by sintering at 800 °C. Nano-sized HA powder was used in the EPD process to produce dense coatings. Moreover, multi-walled 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 composite coatings of HA with different CNT contents (5 to 20%) on Ti6A14V were investigated by scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray 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 coated Ti6A14V had a thickness of about 10 μm without cracks, 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.
Original languageEnglish
Title of host publicationINEC 2010 - 2010 3rd International Nanoelectronics Conference, Proceedings
Pages813-814
Number of pages2
DOIs
Publication statusPublished - 5 May 2010
Event2010 3rd International Nanoelectronics Conference, INEC 2010 - Hongkong, China
Duration: 3 Jan 20108 Jan 2010

Conference

Conference2010 3rd International Nanoelectronics Conference, INEC 2010
Country/TerritoryChina
CityHongkong
Period3/01/108/01/10

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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