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Influence of thickness on the properties of hydroxyapatite coatings deposited by KrF laser ablation

Paper ID Volume ID Publish Year Pages File Format Full-Text
13008 827 2001 5 PDF Available
Title
Influence of thickness on the properties of hydroxyapatite coatings deposited by KrF laser ablation
Abstract

The growth of hydroxyapatite coatings obtained by KrF excimer laser ablation and their adhesion to a titanium alloy substrate were studied by producing coatings with thicknesses ranging from 170 nm up to 1.5 μm, as a result of different deposition times. The morphology of the coatings consists of grain-like particles and also droplets. During growth the grain-like particles grow in size, partially masking the droplets, and a columnar structure is developed. The thinnest film is mainly composed of amorphous calcium phosphate. The coating 350 nm thick already contains hydroxyapatite, whereas thicker coatings present some alpha tricalcium phosphate in addition to hydroxyapatite. The resulting coating to substrate adhesion was evaluated through the scratch test technique. Coatings fail under the scratch test by spallating laterally from the diamond tip and the failure load increases as thickness decreases, until not adhesive but cohesive failure for the thinnest coating is observed.

Keywords
Hydroxyapatite; Calcium phosphate coatings; Laser ablation; Adhesion.
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Influence of thickness on the properties of hydroxyapatite coatings deposited by KrF laser ablation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 22, Issue 15, 1 August 2001, Pages 2171–2175
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