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Activity of plasma sprayed yttria stabilized zirconia reinforced hydroxyapatite/Ti–6Al–4V composite coatings in simulated body fluid

Paper ID Volume ID Publish Year Pages File Format Full-Text
12420 792 2004 9 PDF Available
Title
Activity of plasma sprayed yttria stabilized zirconia reinforced hydroxyapatite/Ti–6Al–4V composite coatings in simulated body fluid
Abstract

Hydroxyapatite (HA)/yttria stabilized zirconia/Ti–6Al–4V bio-composite coatings deposited onto Ti–6Al–4V substrate through a plasma spray technique were immersed in simulated body fluid (SBF) to investigate their behavior in vitro. Surface morphologies and structural changes in the coatings were analyzed by scanning electron microscopy, thin-film X-ray diffractometer, and X-ray photoelectron spectroscopy. The tensile bond strength of the coatings after immersion was also conducted through the ASTM C-633 standard for thermal sprayed coatings. Results showed that carbonate-containing hydroxyapatite (CHA) layer formed on the surface of composite coatings after 4 weeks immersion in SBF solution, indicating the composite coating possessed excellent bioactivity. The mechanical properties were found to decrease with immersion duration of maximum 56 days. However, minimal variation in mechanical properties was found subsequent to achieving supersaturation of the calcium ions, which was attained with the precipitation of the calcium phosphate layers. The mechanical properties of the composite coating were found to be significantly higher than those of pure HA coatings even after immersion in the SBF solution, indicating the enhanced mechanical properties of the composite coatings.

Keywords
Biomaterials; Simulated body fluid; Hydroxyapatite; Composite coating; Plasma spraying
First Page Preview
Activity of plasma sprayed yttria stabilized zirconia reinforced hydroxyapatite/Ti–6Al–4V composite coatings in simulated body fluid
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 25, Issue 16, July 2004, Pages 3177–3185
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering