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Hydroxyapatite-coated Ti–6Al–4V: Part 1: the effect of coating thickness on mechanical fatigue behaviour

Paper ID Volume ID Publish Year Pages File Format Full-Text
13418 855 2002 10 PDF Available
Title
Hydroxyapatite-coated Ti–6Al–4V: Part 1: the effect of coating thickness on mechanical fatigue behaviour
Abstract

The present investigation examines the effect of coating thickness on the fatigue behaviour of hydroxyapatite (HA)-coated Ti–6Al–4V. Uniaxial fatigue tests were conducted on grit blasted Ti–6Al–4V coupons with HA coatings deposited by atmospheric plasma-spray at thicknesses of 0, 25, 50, 75, 100, and 150 μm, as well as on grit blasted specimens that had received a stress relieving heat treatment. Coupons with 150 μm HA coatings were shown to have significantly decreased fatigue resistances, with lives similar to those of the stress relieved specimens, while coatings of thickness 25–100 μm were found to have no affect on fatigue resistance. Residual stresses generated during deposition, cracks propagating towards the substrate from within the coating, and stress relief due to heat inputs from the spraying process were all considered with respect to their potential effects on fatigue behaviour. Stress relief in the substrate due to enhanced heat transfer mechanisms was identified as the most likely source of the observed reductions in substrate fatigue life in the 150 μm coupons.

Keywords
Hydroxyapatite coating; Ti–6Al–4V; Plasma spray; Fatigue; Coating thickness
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 23, Issue 9, May 2002, Pages 1937–1946
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