Titanium Nitride Coatings on Ti Alloys by PIRAC for Orthopedic Implants

In the present work, Ti and Ti-6Al-4V were PIRAC nitrided at the relatively low temperatures of 700-850°C. To obtain thicker TiN layers, 3 stage PIRAC based coating was applied: (1) PIRAC nitriding followed by (2) PIRAC titanizing followed by (3) additional PIRAC nitriding. The microstructure and ph...

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Bibliographic Details
Published in:Key engineering materials 2010-01, Vol.434-435, p.481-484
Main Authors: Gutmanas, Elazar Y., Wu, Shou Jun, Gotman, I.
Format: Article
Language:English
Subjects:
Adhesion
Adhesion tests
Bend tests
Chemical analysis
Coatings
Delaminating
Delamination
Diffraction
Microhardness
Microstructure
Nitriding
Orthopedics
Phase composition
Scanning electron microscopy
Surface layer
Surgical implants
Titanium
Titanium base alloys
Titanium nitride
X-rays
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Summary:In the present work, Ti and Ti-6Al-4V were PIRAC nitrided at the relatively low temperatures of 700-850°C. To obtain thicker TiN layers, 3 stage PIRAC based coating was applied: (1) PIRAC nitriding followed by (2) PIRAC titanizing followed by (3) additional PIRAC nitriding. The microstructure and phase composition of the obtained surface layers were characterized employing X-ray diffraction and scanning electron microscopy with chemical analysis (SEM/EDS). Bending test was employed to evaluate the coatings adhesion to the substrate. Lower PIRAC nitriding temperatures yielded smoother TiN coatings with a more gradual microhardness decrease from the surface to the bulk. All PIRAC TiN based coatings have excellent adhesion to substrate – no delamination of the coating in bending tests was observed. The best combination of microhardness and adhesion was obtained using 3 stage PIRAC process.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.434-435.481