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Influence of abrasion on the surface characteristics of thermally sprayed hydroxyapatite coatings

Paper ID Volume ID Publish Year Pages File Format Full-Text
13583 882 2002 7 PDF Available
Title
Influence of abrasion on the surface characteristics of thermally sprayed hydroxyapatite coatings
Abstract

The surface condition of hydroxyapatite thermal sprayed coatings can be measured in terms of smooth melted and unmelted regions. Both these areas collectively contribute to abrasion resistance of a coated implant. The purpose of this work was to determine the influence of abrasion on the surface characteristics of coatings. Coatings with three degrees of roughness (Ra of 7, 10 and 24 μm) were produced by thermal spraying. These coatings were subjected to abrasion in a pin-on-disk test. It was found that the majority of weight loss occurs within the first minute of the abrasion. Raised areas from the coating are removed and the bone analogue pin spreads amongst the elevated areas to produce a smoother coating. Further, abrasion is dependent upon the applied load. Small loads produce a smaller or negligible increase in coating loss, however, a higher load is able to displace more material from the coating surface. It is expected that the coating loss from plasma sprayed coatings amounts to a value of less than 3 wt% during the insertion into bone. Modification of the coating surface from abrasion is dependent upon the surface roughness of the coating.

Keywords
Abrasion; Hydroxyapatite coatings; Thermal spraying; Roughness; Weight loss
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Influence of abrasion on the surface characteristics of thermally sprayed hydroxyapatite coatings
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 23, Issue 24, December 2002, Pages 4731–4737
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