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Plasma sprayed wollastonite/TiO2 composite coatings on titanium alloys

Paper ID Volume ID Publish Year Pages File Format Full-Text
13174 838 2002 13 PDF Available
Title
Plasma sprayed wollastonite/TiO2 composite coatings on titanium alloys
Abstract

Wollastonite/TiO2 composite coatings were prepared using plasma spraying technology onto Ti-6Al-4V substrate. The composite coatings exhibit obvious lamellar structure with alternating wollastonite coating and TiO2 coating. No obvious cracks exist on the interface between coatings and substrate. In the case of composite coatings, the primarily crystalline phases of the coatings are wollastonite and rutile, indicating wollastonite and TiO2 did not react during plasma spraying process. Some of rutile in the powders transforms into anatase due to plasma spraying. The mean bond strength of the composite coatings is higher than 30 MPa. The Vickers microhardness of coatings increase with the increase in the content of TiO2. Wollastonite/TiO2 composite coatings were soaked in simulated body fluid to examine their bioactivity. Carbonate-containing hydroxyapatite (CHA) layer was formed on the surface of the wollastonite and W7T3 coatings soaked in simulated body fluid, while was not formed on the surface of the TiO2 and W3T7 coatings after immersion. In addition, a rich-silica layer appeared at the interface of CHA and wollastonite and W7T3 coatings. In order to investigate the cytocompatibility of the coatings, osteoblast was seeded onto the surface of the coatings. The scanning electron microscopy observation showed that the addition of wollastonite promote the proliferation of osteoblast. It is enough to prove that the wollastonite and wollastonite/TiO2 composite coatings possess excellent cytocompatibility.

Keywords
Wollastonite/TiO2 composite coatings; Plasma spraying; Bonding strength; Bioactivity; Cytocompatibility
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Plasma sprayed wollastonite/TiO2 composite coatings on titanium alloys
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 23, Issue 20, October 2002, Pages 4065–4077
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us