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Transmission electron microscopy of coatings formed by plasma electrolytic oxidation of titanium

Paper ID Volume ID Publish Year Pages File Format Full-Text
1538 85 2009 11 PDF Available
Title
Transmission electron microscopy of coatings formed by plasma electrolytic oxidation of titanium
Abstract

Transmission electron microscopy and supporting film analyses are used to investigate the changes in composition, morphology and structure of coatings formed on titanium during DC plasma electrolytic oxidation in a calcium- and phosphorus-containing electrolyte. The coatings are of potential interest as bioactive surfaces. The initial barrier film, of mixed amorphous and nanocrystalline structure, formed below the sparking voltage of 180 V, incorporates small amounts of phosphorus and calcium species, with phosphorus confined to the outer ∼63% of the coating thickness. On commencement of sparking, calcium- and phosphorus-rich amorphous material forms at the coating surface, with local heating promoting crystallization in underlying and adjacent anodic titania. The amorphous material thickens with increased treatment time, comprising almost the whole of the ∼5.7-μm-thick coating formed at 340 V. At this stage, the coating is ∼4.4 times thicker than the oxidized titanium, with a near-surface composition of about 12 at.% Ti, 58 at.% O, 19 at.% P and 11 at.% Ca. Further, the amount of titanium consumed in forming the coating is similar to that calculated from the anodizing charge, although there may be non-Faradaic contributions to the coating growth.

Keywords
Titanium; Anodizing; Plasma electrolytic oxidation; Transmission electron microscopy
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Transmission electron microscopy of coatings formed by plasma electrolytic oxidation of titanium
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 5, Issue 4, May 2009, Pages 1356–1366
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
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