Adhesion enhancement of DLC on CoCrMo alloy by diamond and nitrogen incorporation for wear resistant applications

Corona-Gomez, J.; Shiri, Sheida; Mohammadtaheri, M.; Yang, Q.

doi:10.1016/j.surfcoat.2017.10.050

Cited by 46 publications

(11 citation statements)

References 27 publications

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“…This was not the case for BSA lubrication, where the boundary absorption layer of proteins could be considered as a main influencing factor. Accordingly, experiments from Corona-Gomez et al [ 45 ] with chemical vapor deposited (CVD) DLC coatings on CoCr disks rubbing against UHMWPE balls under lubrication with distilled water revealed friction and wear reduction. Lately, Rothammer et al [ 46 ] used a metal ring-on-UHMWPE disk tribometer in rotational sliding mode and lubrication by bovine calf serum (BCS) to screen various types of DLC coatings, namely pure, silicon-oxide- and titanium-doped hydrogenated amorphous carbon coatings deposited on CoCr as well as Ti64.…”

Section: Introductionmentioning

confidence: 99%

Amorphous Carbon Coatings for Total Knee Replacements—Part II: Tribological Behavior

et al. 2021

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Diamond-like carbon coatings may decrease implant wear, therefore, they are helping to reduce aseptic loosening and increase service life of total knee arthroplasties (TKAs). This two-part study addresses the development of such coatings for ultrahigh molecular weight polyethylene (UHMWPE) tibial inlays as well as cobalt-chromium-molybdenum (CoCr) and titanium (Ti64) alloy femoral components. While the deposition of a pure (a-C:H) and tungsten-doped hydrogen-containing amorphous carbon coating (a-C:H:W) as well as the detailed characterization of mechanical and adhesion properties were the subject of Part I, the tribological behavior is studied in Part II. Pin-on-disk tests are performed under artificial synovial fluid lubrication. Numerical elastohydrodynamic lubrication modeling is used to show the representability of contact conditions for TKAs and to assess the influence of coatings on lubrication conditions. The wear behavior is characterized by means of light and laser scanning microscopy, Raman spectroscopy, scanning electron microscopy and particle analyses. Although the coating leads to an increase in friction due to the considerably higher roughness, especially the UHMWPE wear is significantly reduced up to a factor of 49% (CoCr) and 77% (Ti64). Thereby, the coating shows continuous wear and no sudden failure or spallation of larger wear particles. This demonstrated the great potential of amorphous carbon coatings for knee replacements.

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Section: Introductionmentioning

confidence: 99%

Amorphous Carbon Coatings for Total Knee Replacements—Part II: Tribological Behavior

et al. 2021

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“…The influence of nitrogen impurities on the structure and properties of DLC and ta-C coatings can be expected during annealing in ambient air and in sliding tests at high temperatures. The increase in the sp 2 bond content, release of the stress, and improvement in the adhesion to Si and CoCrMo alloys were revealed for nitrogen-doped DLC coatings [40,41].…”

Section: Introductionmentioning

confidence: 92%

High-Temperature Tribological Performance of Al2O3/a-C:H:Si Coating in Ambient Air

et al. 2021

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The study investigates thermal stability and high temperature tribological performance of a-C:H:Si diamond-like carbon (DLC) coating. A thin alumina layer was deposited on top of the a-C:H:Si coating to improve the tribological performance at high temperatures. The a-C:H:Si coating and alumina layer were prepared using plasma-activated chemical vapour deposition and atomic layer deposition, respectively. Raman and X-ray photoelectron spectroscopy were used to investigate the structures and chemical compositions of the specimens. The D and G Raman peaks due to sp2 bonding and the peaks corresponding to the trans-polyacetylene (t-Pa) and sp bonded chains were identified in the Raman spectra of the a-C:H:Si coating. Ball-on-disc sliding tests were carried out at room temperature and 400 °C using Si3N4 balls as counter bodies. The a-C:H:Si coating failed catastrophically in sliding tests at 400 °C; however, a repeatable and reproducible regime of sliding with a low coefficient of friction was observed for the Al2O3/a-C:H:Si coating at the same temperature. The presence of the alumina layer and high stress and temperature caused structural changes in the bulk a-C:H:Si and top layers located near the contact area, leading to the modification of the contact conditions, delivering of extra oxygen into the contact area, reduction of hydrogen effusion, and suppression of the atmospheric oxidation.

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“…The Rockwell hardness test (VDI 3198) is often used to evaluate the adhesion of hard coatings to various materials [36][37][38][39][40]. In conformity with the VDI 3198, the adhesive strength quality HF1-HF4 defines strong interfacial adhesion and is usually applied in practice, whereas HF5 and HF6 define poor adhesion and are not acceptable [33].…”

Section: Adhesion Of A-c:h:sio X Filmsmentioning

confidence: 99%

In Vitro Biodegradation of a-C:H:SiOx Films on Ti-6Al-4V Alloy

et al. 2022

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This paper focuses mainly on the in vitro study of a five-week biodegradation of a-C:H:SiOx films of different thickness, obtained by plasma-assisted chemical vapor deposition onto Ti-6Al-4V alloy substrate using its pulsed bipolar biasing. In vitro immersion of a-C:H:SiOx films in a solution of 0.9% NaCl was used. It is shown how the a-C:H:SiOx film thickness (0.5–3 µm) affects the surface morphology, adhesive strength, and Na+ and Cl− precipitation on the film surface from the NaCl solution. With increasing film thickness, the roughness indices are reducing a little. The adhesive strength of the a-C:H:SiOx films to metal substrate corresponds to quality HF1 (0.5 µm in thickness) and HF2-HF3 (1.5–3 µm in thickness) of the Rockwell hardness test (VDI 3198) that defines strong interfacial adhesion and is usually applied in practice. The morphometric analysis of the film surface shows that on a-C:H:SiOx-coated Ti-6Al-4V alloy surface, the area occupied by the grains of sodium chloride is lower than on the uncoated surface. The reduction in the ion precipitation from 0.9% NaCl onto the film surface depended on the elemental composition of the surface layer conditioned by the thickness growth of the a-C:H:SiOx film. Based on the results of energy dispersive X-ray spectroscopy, the multiple regression equations are suggested to explain the effect of the elemental composition of the a-C:H:SiOx film on the decreased Na+ and Cl− precipitation. As a result, the a-C:H:SiOx films successfully combine good adhesion strength and rare ion precipitation and thus are rather promising for medical applications on cardiovascular stents and/or friction parts of heart pumps.

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Adhesion enhancement of DLC on CoCrMo alloy by diamond and nitrogen incorporation for wear resistant applications

Cited by 46 publications

References 27 publications

Amorphous Carbon Coatings for Total Knee Replacements—Part II: Tribological Behavior

Amorphous Carbon Coatings for Total Knee Replacements—Part II: Tribological Behavior

High-Temperature Tribological Performance of Al2O3/a-C:H:Si Coating in Ambient Air

In Vitro Biodegradation of a-C:H:SiOx Films on Ti-6Al-4V Alloy

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