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

2006 ◽  
Vol 416 (1-2) ◽  
pp. 253-260 ◽  
Author(s):  
Aravind Vadiraj ◽  
M. Kamaraj
Keyword(s):  
Titanium Alloys ◽  
Fretting Fatigue ◽  
Damage Characterization ◽  
Surface Modified ◽  
Medical Grade

Fretting Fatigue Studies of Surface Modified Biomedical Titanium Alloys

2007 ◽  
Vol 539-543 ◽  
pp. 681-686
Author(s):  
Aravind Vadiraj ◽  
M. Kamaraj
Keyword(s):  
Friction Coefficient ◽  
Titanium Alloys ◽  
Thermal Oxidation ◽  
Fatigue Damage ◽  
Plasma Nitriding ◽  
Normal Pressure ◽  
Fretting Fatigue ◽  
Laser Nitriding ◽  
Surface Modified

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.

XPS characterization of surface modified titanium alloys for use as biomaterials

Vacuum ◽  
2011 ◽  
Vol 85 (12) ◽  
pp. 1076-1079 ◽  
Author(s):  
M.F. López ◽  
J.A. Jiménez ◽  
A. Gutiérrez
Keyword(s):  
Titanium Alloys ◽  
Xps Characterization ◽  
Surface Modified

Synthesis and Characterization of Nitrogen Implanted Titanium Alloys

2007 ◽  
Vol 29-30 ◽  
pp. 91-94
Author(s):  
B.Y. Choi ◽  
J.K. Jeong ◽  
Y.B. Lim
Keyword(s):  
Wear Resistance ◽  
Titanium Alloys ◽  
Electron Spectroscopy ◽  
Auger Electron ◽  
Wear Track ◽  
Nitrogen Concentration ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Modified

Nitrogen implanted titanium alloys with enhanced wear resistance have been synthesized under the conditions of energy and N++N2 +ion dose in the range of 30keV to 120keV and 3×1017ions/cm2 to 1×1018ions/cm2, respectively. Auger electron spectroscopy and X-ray diffraction show that supersaturated titanium solid solution with the gradient nitrogen concentration and titanium nitride compounds are formed in the surface modified regions of the materials. Enhanced wear resistance of the nitrogen implanted titanium alloy at energy of 120keV and ion dose of 1×1018ions/cm2 has been showed and explained on the basis of observed microstructure including the formation of micropits on the wear track in the present study.

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

2006 ◽  
Vol 22 (9) ◽  
pp. 1119-1125 ◽  
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

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

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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