http://www.paper.edu.cn
-1-
Colloidal-sol gel derived rough Mn-TCP/FHA coatings
with high adhesion strength
1
Ren Changbao
1
, Lin Jun
2
, Cheng Kui
1
, Weng Wenjian
1
, Miao Shundong
1
, Siqian
Liu
1
1 Department of Materials Science and Engineering, Zhejiang University, Hangzhou(310027)
2 The 1st Affiliated Hospital, Zhejiang University, Hangzhou(310000)
Email: junlin2@126.com; chengkui@zju.edu.cn
Abstract
In thiswork, composite calcium phosphate coatings containing Manganese ions are prepared
through a colloidal-sol gel method. Mn containing -tricalcium phosphate powders are embedded
in a fluoridated hydroxyapatite (FHA) matrix to form Mn-TCP-FHA composites via colloidal-sol
gel method. This composite layer is deposited on top of a FHA layer to form a Mn-TCP-FHA/FHA
biphasic coating. The powder incorporation not only impart the coatings with Mn releasing ability,
but also greatly increases the surface roughness. However, due to the mismatch of coefficients of
thermale expanion (CTE), some cracks could be observed in the coatings. Despite that, the bottom
FHA layer effectively buffered such mismatch, the adhesion strength of the coatings with the
substrate remains virtually constant: over 400 mN in scanning scratch test.
Keywords: Mn-TCP/FHA coatings, composite, colloidal-sol gel, roughness, adhesion strength
1. Introduction
The text must be confined within a rectangle 8.5 inches wide and 11 inches long. The left
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Please pay special attention to the instructions in section 3 regarding figures, tables,
acknowledgements, and references.
Hydroxyapatite (HA) is one of the best coating candidates on metallic biomedical
implants to improve the interaction between the implant and host tissue. However, pure HA
coating has relatively large solubility in vivo that leads to long-term stability concern [1]-[2].
Although incorporation of fluorine into the HA structure to form fluoridated hydroxyapatite
(FHA) [3]-[5] renders dissolution resistance, the cell activities are adversely affected owing to
the reduced Ca
2+
and PO
4
3-
ion concentration at the vicinity of the implant, because these ions
help cell activities and osteointegration [6]-[8].
In recent years, some researchers have tried to incorporated certain metal ions in calcium
phosphate coatings owing to their unique effects on human enzyme systems [9]. E.g.,
Manganese is reported to be able to activate integrin and thus promote the attachment of living
1
Support by Research Fund of the Doctoral Program of Higher Education of China (20050335040 and
200703351015), Scientific Research Foundation for Returned Scholars (JIAO WAI SI LIU 2008–890).
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