Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1584447 | Materials Science and Engineering: A | 2007 | 8 Pages |
Abstract
Fretting wear resistance of uncoated and surface modified biomedical titanium alloys (Ti-6Al-7Nb) in air and Ringer fluid has been investigated in the present work. Laser nitrided specimen has shown superior performance with minimum surface damage and wear rate (<0.1Â ÃÂ 10â6Â mm3/Nm) despite high friction coefficient in air (0.6) compared to uncoated and plasma nitrided (>12Â ÃÂ 10â6Â mm3/Nm) specimens. This is due to presence of TiN dendrites (60-80%) in the laser nitrided layer. Plasma nitrided surface is relatively softer and hence wear rates and surface damage are comparable with uncoated alloys. Friction coefficient is high for uncoated (0.8) and plasma nitrided alloys (0.6) in air as well as Ringer fluid. Fretting induced electrochemical dissolution is responsible for higher wear rates in uncoated and plasma nitrided specimens. The fretting damage resistance is primarily governed by relative hardness and modified layer thickness of the mating components.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Aravind Vadiraj, M. Kamaraj, R. Gnanamoorthy,