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A protocol to develop crack-free biomimetic coatings on Ti6Al4V substrates

Published online by Cambridge University Press:  31 January 2011

Sahil Jalota ,
Sutapa Bhaduri ,
Sarit B. Bhaduri  and
A. Cuneyt Tas
Sahil Jalota*
Affiliation:
School of Materials Science and Engineering, Clemson University, Clemson, South Carolina 29634
Sutapa Bhaduri
Affiliation:
School of Materials Science and Engineering, Clemson University, Clemson, South Carolina 29634
Sarit B. Bhaduri
Affiliation:
School of Materials Science and Engineering, Clemson University, Clemson, South Carolina 29634
A. Cuneyt Tas
Affiliation:
Department of Biomedical Engineering, Yeditepe University, Kayisdagi/Kadikoy, Istanbul 34755, Turkey
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Biomimetic coating of titanium and related alloys with carbonated apatitic calcium phosphate is an important area of research in implantology. While this paper specifically refers to coating Ti6Al4V, the results are valid with other related alloys as well. One step in the protocol involves an intermediate alkali treatment of Ti6Al4V to form a sodium titanate layer on the alloy surface. This pretreatment enhances the formation of the coating from simulated body fluid (SBF) solutions. Many papers in the biomimetic coating literature demonstrate the presence of cracks in coatings, irrespective of the SBF compositions and placement of the substrates. The presence of cracks may result in degradation and delamination of coatings. To the best of our knowledge, this issue remains unresolved. Therefore, the aim of this study was: (i) to examine and understand the reasons for cracking and (ii) based on the results, to develop a protocol for producing crack-free apatitic calcium phosphate coatings on Ti6Al4V substrates. In this study, the authors focused their attention on the alkali treatment procedure and the final drying step. It is hypothesized that these two steps of the process affect the crack formation the most. In the first case, the surfaces of alkali-treated substrates were examined with/without water-soaking treatment before immersing in SBF. This water treatment modifies the sodium titanate surface layer. In the second case, two different drying techniques (after soaking in SBF) were used. In one procedure, the coated substrates were dried rapidly, and in the other they were dried slowly. It was observed that the water treatment, irrespective of the drying method, provides a surface, which on subsequent soaking in SBF forms a crack-free apatitic calcium phosphate coating. Based on these results, the authors suggest a protocol incorporating a water-soaking treatment after the alkali treatment and prior to the SBF soaking treatment to obtain crack-free coatings.

Keywords

CeramicCoatingTi
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 6 , June 2007 , pp. 1593 - 1600
Copyright
Copyright © Materials Research Society2007

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