Novel sphene coatings on Ti–6Al–4V for orthopedic implants using sol–gel method

Wu, Chengtie, Ramaswamy, Yogambha, Gale, David, Yang, Wenrong, Xiao, Keqin, Zhang, Liangchi, Yin, Yongbai and Zreiqat, Hala 2008, Novel sphene coatings on Ti–6Al–4V for orthopedic implants using sol–gel method, Acta biomaterialia, vol. 4, no. 3, pp. 569-576, doi: 10.1016/j.actbio.2007.11.005.

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Title Novel sphene coatings on Ti–6Al–4V for orthopedic implants using sol–gel method
Author(s) Wu, Chengtie
Ramaswamy, Yogambha
Gale, David
Yang, WenrongORCID iD for Yang, Wenrong
Xiao, Keqin
Zhang, Liangchi
Yin, Yongbai
Zreiqat, Hala
Journal name Acta biomaterialia
Volume number 4
Issue number 3
Start page 569
End page 576
Total pages 8
Publisher Elsevier B.V.
Place of publication Amsterdam, The Netherlands
Publication date 2008-05
ISSN 1742-7061
Keyword(s) sphene
titanium alloy
surface chemistry modification
Summary Hydroxyapatite (HAp) is commonly used to coat titanium alloys (Ti–6Al–4V) for orthopedic implants. However, their poor adhesion strength and insufficient long-term stability limit their application. Novel sphene (CaTiSiO5) ceramics possess excellent chemical stability and cytocompatibility. The aim of this study is to use the novel sphene ceramics as coatings for Ti–6Al–4V. The sol–gel method was used to produce the coatings and the thermal properties, phase composition, microstructure, thickness, surface roughness and adhesion strength of sphene coatings were analyzed by differential thermal analysis–thermal gravity (DTA–TG), X-ray diffraction (XRD), scanning electron microscopy (SEM), atom force microscopy (AFM) and scratch test, respectively. DTA analysis confirmed that the temperature of the sphene phase formation is 875 °C and XRD analysis indicated pure sphene coatings were obtained. A uniform structure of the sphene coating was found across the Ti–6Al–4V surface, with a thickness and surface roughness of the coating of about 0.5–1 μm and 0.38 μm, respectively. Sphene-coated Ti–6Al–4V possessed a significantly improved adhesion strength compared to that for HAp coating and their chemical stability was evaluated by testing the profile element distribution and the dissolution kinetics of calcium (Ca) ions after soaking the sphene-coated Ti–6Al–4V in Tris–HCl solution. Sphene coatings had a significantly improved chemical stability compared to the HAp coatings. A layer of apatite formed on the sphene-coated Ti–6Al–4V after they were soaked in simulated body fluids (SBF). Our results indicate that sol–gel coating of novel sphene onto Ti–6Al–4V possessed improved adhesion strength and chemical stability, compared to HAp-coated Ti–6Al–4V prepared under the same conditions, suggesting their potential application as coatings for orthopedic implants.
Language eng
DOI 10.1016/j.actbio.2007.11.005
Field of Research 100703 Nanobiotechnology
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2007, Acta Materialia
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