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Microstructure and mechanical properties of plasma sprayed HA/YSZ/Ti–6Al–4V composite coatings

Paper ID Volume ID Publish Year Pages File Format Full-Text
12906 822 2004 9 PDF Available
Title
Microstructure and mechanical properties of plasma sprayed HA/YSZ/Ti–6Al–4V composite coatings
Abstract

Plasma sprayed hydroxyapatite (HA) coatings on titanium alloy substrate have been used extensively due to their excellent biocompatibility and osteoconductivity. However, the erratic bond strength between HA and Ti alloy has raised concern over the long-term reliability of the implant. In this paper, HA/yttria stabilized zirconia (YSZ)/Ti–6Al–4V composite coatings that possess superior mechanical properties to conventional plasma sprayed HA coatings were developed. Ti–6Al–4V powders coated with fine YSZ and HA particles were prepared through a unique ceramic slurry mixing method. The so-formed composite powder was employed as feedstock for plasma spraying of the HA/YSZ/Ti–6Al–4V coatings. The influence of net plasma energy, plasma spray standoff distance, and post-spray heat treatment on microstructure, phase composition and mechanical properties were investigated. Results showed that coatings prepared with the optimum plasma sprayed condition showed a well-defined splat structure. HA/YSZ/Ti–6Al–4V solid solution was formed during plasma spraying which was beneficial for the improvement of mechanical properties. There was no evidence of Ti oxidation from the successful processing of YSZ and HA coated Ti–6Al–4V composite powders. Small amount of CaO apart from HA, ZrO2 and Ti was present in the composite coatings. The microhardness, Young's modulus, fracture toughness, and bond strength increased significantly with the addition of YSZ. Post-spray heat treatment at 600°C and 700°C for up to 12 h was found to further improve the mechanical properties of coatings. After the post-spray heat treatment, 17.6% increment in Young's modulus (E) and 16.3% increment in Vicker's hardness were achieved. The strengthening mechanisms of HA/YSZ/Ti–6Al–4V composite coatings were related to the dispersion strengthening by homogeneous distribution of YSZ particles in the matrix, the good mechanical properties of Ti–6Al–4V and the formation of solid solution among HA, Ti alloy and YSZ components.

Keywords
Plasma spraying; Hydroxyapatite; Yttria stabilized zirconia; Ti alloy; Mechanical property; Composite coating
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Microstructure and mechanical properties of plasma sprayed HA/YSZ/Ti–6Al–4V composite coatings
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 25, Issue 18, August 2004, Pages 4009–4017
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