Nanoscale deformation mechanism of TiC/a-C nanocomposite thin films

Chen, C. Q.; Pei, Yu; Shaha, K. P.; Hosson, J.Th.M. De

doi:10.1063/1.3130123

Cited by 30 publications

(7 citation statements)

References 28 publications

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“…It is likely this approach could be successfully extrapolated to more complex DLC-based coatings. 51,52 V. CONCLUSIONS Simulation studies show that in uncoated silicon the hydrostatic stresses developed beneath the indenter are significantly higher than the shear stresses, consistent with observations that phase transformation is the dominant deformation mechanism. The presence of the DLC coating above Si provides load shielding and alters the distribution of stresses experienced by the substrate, lowering both the hydrostatic and the shear stresses.…”

Section: Discussionsupporting

confidence: 67%

Correlation of nanoindentation-induced deformation microstructures in diamondlike carbon coatings on silicon substrates with simulation studies

et al. 2010

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The effect of the presence of diamondlike carbon coatings deposited on (100) Si substrates on the deformation mechanisms operating in the silicon substrate during contact loading have been investigated by both cross-sectional transmission electron microscopy and modeling of the stresses generated beneath the indenter tip. The observed subsurface microstructures were correlated to the Tresca shear stress and the hydrostatic stress generated in the silicon substrate beneath the indenter tip. The presence of the coating altered the stresses generated in the substrate, and changed the deformation mechanism from one of principally phase transformation in uncoated Si to predominantly dislocation motion in the silicon substrate for the diamondlike C-Si system. The magnitude and distribution of the shear and hydrostatic stresses in the substrate were found to depend on both the indentation load and the thickness of the coating. Furthermore, the observed width of deformation, parallel to the interface, which was found to increase with coating thickness, was correlated to the wider distribution of the Tresca shear stress in the substrate brought about by the presence of the coating.

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Section: Discussionsupporting

confidence: 67%

Correlation of nanoindentation-induced deformation microstructures in diamondlike carbon coatings on silicon substrates with simulation studies

et al. 2010

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“…According to previous work, H 3 /E 2 and H/E are suggested as an indicator of toughness, namely the resistance to plastic deformation and wear resistance, respectively. 9,28,29 The film with high H 3 /E 2 and H/E values indicates that nanomultilayer deposited under graded bias voltage may display high toughness.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Properties and in Vitro and in Vivo Biocompatibility of a-C/a-C:Ti Nanomultilayer Films on Ti6Al4V Alloy as Medical Implants

Bai

Wang

et al. 2017

ACS Appl. Mater. Interfaces

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Hydrogen-free a-C/a-C:Ti nanomultilayer films are deposited on medical Ti6Al4V alloy using a closed field unbalanced magnetron sputtering under graded bias voltage. The mechanical and tribological properties of the nanomultilayer films are performed on the nanoindentor, Rockwell and scratch tests, and ball-on-disk tribometer. The biological properties are evaluated by cell cytotoxicity, genotoxicity, subchronic systemic toxicity and implant. The hard a-C/a-C:Ti nanomultilayer films on medical alloy exhibit high adhesion strength and excellent tribological properties in both ambient air and Hank's solution. Biocompatibility results reveal the film no cytotoxity, no genotoxicity, no subchronic systemic toxicity and no contraindications in implant systems. Because of excellent mechanical properties and biosafety, the carbon-based films on medical alloy unveils a prospective application in medical implants.

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“…Diamond like carbon (DLC) films are of significant interest because of their unique combination of chemical-physical properties, high wear resistance and low friction [5]. Nanocomposite coatings based on dispersion of TiC nanocrystalline phases in solid lubricant phases like amorphous carbon (a-C) or amorphous hydrocarbon (a-C:H) have been shown to enhance the hardness and toughness while maintaining the low coefficient of friction [6][7][8][9][10]. Such films show great potential for exploitation as a protective and lubricant layer to enhance the wear resistance of many tribological applications in ambient air or in vacuum.…”

Section: Introductionmentioning

confidence: 99%

Effect of process parameters on mechanical and tribological performance of pulsed-DC sputtered TiC/a-C:H nanocomposite films

Shaha

Pei

Martínez-Martínez

et al. 2010

Surface and Coatings Technology

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Mechanical, structural, chemical bonding (sp 3 /sp 2), and tribological properties of films deposited by pulsed-DC sputtering of Ti targets in Ar/C 2 H 2 plasma were studied as a function of the substrate bias voltage, Ti-target current, C 2 H 2 flow rate and pulse frequency by nanoindentation, Raman spectroscopy and ball-on-disc tribometry. The new findings in this study comprise: dense, column-free, smooth, and ultra-low friction TiC/a-C:H films are obtained at a lower substrate bias voltage by pulsed-DC sputtering at 200 and 350 kHz frequency. The change in chemical and phase composition influences the tribological performance where the TiC/a-C:H films perform better than the pure a-C:H films. In the case of TiC/a-C:H nanocomposite films, a higher sp 2 content and the presence of TiC nanocrystallites at the sliding surface promote formation of a transfer layer and yield lower friction. In the case of a-C:H films, a higher sp 3 content and higher stress promote formation of hard wear debris during sliding, which cause abrasive wear of the ball counterpart and yield higher friction.

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Nanoscale deformation mechanism of TiC/a-C nanocomposite thin films

Cited by 30 publications

References 28 publications

Correlation of nanoindentation-induced deformation microstructures in diamondlike carbon coatings on silicon substrates with simulation studies

Correlation of nanoindentation-induced deformation microstructures in diamondlike carbon coatings on silicon substrates with simulation studies

Mechanical Properties and in Vitro and in Vivo Biocompatibility of a-C/a-C:Ti Nanomultilayer Films on Ti6Al4V Alloy as Medical Implants

Effect of process parameters on mechanical and tribological performance of pulsed-DC sputtered TiC/a-C:H nanocomposite films

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