Characterization of fretting fatigue damage of PVD TiN coated biomedical titanium alloys

Fretting fatigue is a form of adhesive wear damage caused due to tangential micro motion of two contact bodies under normal pressure and cyclic load. Biomedical implants such as hip joints and bone plates undergo fretting fatigue damage leading to premature in-vivo failure and revision surgeries. Surface modification of implants delays the process of fretting and thereby improves the life of these medical devices. This work involves investigation of fretting fatigue damage of surface treated titanium alloys couple. The surface treatment involves PVD TiN coating, Plasma nitriding, Ion Implantation, Laser nitriding and thermal oxidation. Fretting of all surface treated alloys have shown both adhesive and abrasive mode of contact damage. Friction coefficient of all the surface treated pairs is less compared to uncoated alloys. Plasma nitrided pairs have shown the best performance in terms of fretting fatigue life and friction coefficient compared to all other coatings. Ion implanted pairs have shown little improvement in fretting fatigue lives due to shallow modified layer. PVD TiN coated pairs have irregular friction pattern due to abrasive particles at contact. Thermal oxidation and Laser nitriding have shown poor fretting fatigue performance due to high case thickness.

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Nondestructive Characterization of Fretting Fatigue Damage

Journal of Nondestructive Evaluation ◽

10.1007/s10921-004-0821-5 ◽

2004 ◽

Vol 23 (4) ◽

pp. 153-162 ◽

Cited By ~ 4

Author(s):

C. L. Neslen ◽

S. Mall ◽

S. Sathish

Keyword(s):

Fatigue Damage ◽

Fretting Fatigue ◽

Nondestructive Characterization

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Effect of surface modified layers on fretting fatigue damage of biomedical titanium alloys

Materials Science and Technology ◽

10.1179/174328406x109212 ◽

2006 ◽

Vol 22 (9) ◽

pp. 1119-1125 ◽

Cited By ~ 9

Author(s):

A. Vadiraj ◽

M. Kamaraj ◽

U. Kamachi Mudali ◽

A. K. Nath

Keyword(s):

Titanium Alloys ◽

Fatigue Damage ◽

Fretting Fatigue ◽

Surface Modified ◽

Effect Of Surface

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Damage characterization of unmodified and surface modified medical grade titanium alloys under fretting fatigue condition

Materials Science and Engineering A ◽

10.1016/j.msea.2005.10.030 ◽

2006 ◽

Vol 416 (1-2) ◽

pp. 253-260 ◽

Cited By ~ 12

Author(s):

Aravind Vadiraj ◽

M. Kamaraj

Keyword(s):

Titanium Alloys ◽

Fretting Fatigue ◽

Damage Characterization ◽

Surface Modified ◽

Medical Grade

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Effect of surface treatments on fretting fatigue damage of biomedical titanium alloys

Tribology International ◽

10.1016/j.triboint.2006.02.064 ◽

2007 ◽

Vol 40 (1) ◽

pp. 82-88 ◽

Cited By ~ 49

Author(s):

Aravind Vadiraj ◽

M. Kamaraj

Keyword(s):

Titanium Alloys ◽

Fatigue Damage ◽

Fretting Fatigue ◽

Surface Treatments ◽

Effect Of Surface

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TEM characterization of reaction zone in a SiC fiber-reinforced titanium alloy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100105758 ◽

1988 ◽

Vol 46 ◽

pp. 738-739

Author(s):

G. Das ◽

R. E. Omlor

Keyword(s):

Titanium Alloys ◽

Reaction Zone ◽

Carbon Layer ◽

Fiber Reinforced ◽

Reaction Products ◽

Sic Fibers ◽

Sic Fiber ◽

The Matrix ◽

Immense Potential

Fiber reinforced titanium alloys hold immense potential for applications in the aerospace industry. However, chemical reaction between the fibers and the titanium alloys at fabrication temperatures leads to the formation of brittle reaction products which limits their development. In the present study, coated SiC fibers have been used to evaluate the effects of surface coating on the reaction zone in the SiC/IMI829 system.IMI829 (Ti-5.5A1-3.5Sn-3.0Zr-0.3Mo-1Nb-0.3Si), a near alpha alloy, in the form of PREP powder (-35 mesh), was used a茸 the matrix. CVD grown AVCO SCS-6 SiC fibers were used as discontinuous reinforcements. These fibers of 142μm diameter contained an overlayer with high Si/C ratio on top of an amorphous carbon layer, the thickness of the coating being ∽ 1μm. SCS-6 fibers, broken into ∽ 2mm lengths, were mixed with IMI829 powder (representing < 0.1vol%) and the mixture was consolidated by HIP'ing at 871°C/0. 28GPa/4h.

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