Journal
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
Volume 102, Issue 5, Pages 988-1001Publisher
WILEY-BLACKWELL
DOI: 10.1002/jbm.b.33079
Keywords
Ti-Al intermetallics; surface modification; plasma electrolytic oxidation; biomedical applications
Funding
- National Institutes of Health (NIH) [SO6GM-08103]
- National Institute of General Medical Sciences (NIGMS)/ MBRS-SCORE
- University of Puerto Rico, Mayaguez Campus
- National Science Foundation [DMR 0922994]
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In an attempt to enhance the potential of gamma titanium aluminide intermetallic alloy as a biomaterial, its surface characteristics were successfully modified using a calcium and phosphorous rich electrolyte through the application of plasma electrolytic oxidation. Scanning electron microscopy and atomic force microscopy were used to characterize the morphology and topographical features of the resulting coating while X-ray diffraction and energy dispersive spectroscopy were used to determine the surface oxide composition. The mechanical properties of the surface coating were characterized by nanoindentation studies. The results observed show the formation of a submicron scale porous structure and a concomitant increase in the surface roughness. The surface oxide was composed of rutile and anatase phases. Composition gradients of Ca and P were also present which can possibly enhance the biomaterial application potential of this treated surface. Nanoindentation measurements indicate the formation of a fairly compact oxide during the process. (C) 2013 Wiley Periodicals, Inc.
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