Raman analysis of DLC coated engine components with complex shape: Understanding wear mechanisms

Jaoul, Cédric; Jarry, O.; Tristant, Pascal; Merle-Méjean, Thérèse; Colas, Maggy; Dublanche-Tixier, Christelle; Jacquet, Jean-Marie

doi:10.1016/j.tsf.2009.09.110

Cited by 28 publications

(10 citation statements)

References 17 publications

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“…Generation of ferrous wear particles from the worn CI counterbody along with the scratches with positive edges on the surface, decrease the contact area and increase the contact pressure significantly. Thus, subsequently reduces the temperature required for initiation of graphitisation and accelerate the graphitisation process [48,49]. Estimation of the phase transformation temperature for DLC coating has also been reported elsewhere [39,50] showing the important role of contact pressure on structural changes of a-C:15H.…”

Section: Eqmentioning

confidence: 75%

“…The high contact pressure exerted by positive edges of the scratches [48] and "micro-size" iron particles coming from the counterbody [50] could be responsible for graphitisation of the a-C:15H surface which consequently could lead to severe delamination of the a-C:15H coating. It is interesting that the pin wear provided by PAO was less than those of fully formulated oils.…”

Section: Eqmentioning

confidence: 99%

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Tribological performance and tribochemical processes in a DLC/steel system when lubricated in a fully formulated oil and base oil

Kosarieh

Morina

Lainé

et al. 2013

Surface and Coatings Technology

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Abstract:Diamond-like carbon (DLC) coatings show extremely good promise for a number of applications in automotive components as they exhibit excellent tribological properties such as low friction and good wear resistance. This can impact on improved fuel economy and durability of the engine components. Much work has been reported on the dry sliding of DLC coatings with less so in lubricated contacts and, as such, there is a need to further understand the tribochemistry of lubricated DLC contacts. Commercially-available oils are normally optimized to work on ferrous surfaces. Previous studies on DLC lubricated contacts have tended to use model oil systems rather than fully formulated lubricants and from this an interesting picture of lubrication mechanisms is emerging. Optimising compatibility between a surface and a set of lubricant additives may lead to excellent durability (wear) as well as increased fuel economy (low friction). In this work, the friction and wear properties of a DLC coating under boundary lubrication conditions have been investigated and the tribological performance compared with that of an uncoated steel system. A pin-on-plate tribotester was used to run the experiments using High speed steel (HSS) M2 grade plates coated with 15 at.% hydrogenated DLC (a-C:15H) sliding against cast iron pins. A Group III mineral base oil, fully synthetic Group IV PAO and four different fully formulated oils were used in this study. Furthermore optical and scanning electron microscopes (SEM) were used to observe the wear scar and to assess the durability of the coatings. Energy-Dispersive X-ray analysis (EDX), X-ray Photoelectron Spectroscopy (XPS) and Raman spectroscopy analyses were performed on the tribofilms to understand the tribochemical interactions between oil additives and the a-C:15H coating.This study show that the durability of the a-C:15H coating strongly depends on the selected additive package in the oils. In addition the effect of detergent, dispersant and antioxidants on the performance of the Molybdenum-based friction modifier (Mo-FM) and ZDDP anti-wear additive were investigated and results are reported in this paper.

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Section: Eqmentioning

confidence: 75%

Section: Eqmentioning

confidence: 99%

Tribological performance and tribochemical processes in a DLC/steel system when lubricated in a fully formulated oil and base oil

Kosarieh

Morina

Lainé

et al. 2013

Surface and Coatings Technology

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“…DLC is a combination of sp 2 and sp 3 hybridized bonds, where tribological outcomes of these coatings depend on the sp 2 /sp 3 bonding ratio [23, 38]. The relative ratio of the D peak and G peak ( I d / I g ) plays a significant role in Raman spectra to characterize the sp 2 /sp 3 bonding ratio [23].…”

Section: Resultsmentioning

confidence: 99%

“…The I d / I g ratio is high (0.81) at 131 MPa, which confirms a high degree of graphitization. Graphite-like sp2 type content has a low shear strength, and, hence, coated materials are progressively removed from the surface [38]. Interestingly, the friction coefficient increases rapidly over the all lubricants at 151 MPa, because the transfer film also moves from the contact area due to higher load.…”

Section: Resultsmentioning

confidence: 99%

Tribological investigation of diamond-like carbon coated micro-dimpled surface under bovine serum and osteoarthritis oriented synovial fluid

Ghosh

Choudhury

Roy

et al. 2015

Science and Technology of Advanced Materials

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Osteoarthritis-oriented synovial fluid (OASF), i.e., that typical of a patient with osteoarthritis, has different physical and biological characteristics than bovine serum (BS), a lubricant widely used in biotribological investigations. Micro-dimpled and diamond-like carbon- (DLC) coated surfaces are key emerging interfaces for orthopedic implants. In this study, tribological performances of dimpled surfaces, with and without DLC coating, have been investigated under both BS and OASF. The friction tests were performed utilizing a pin on a disk tribometer, whereas contact pressure, speed, and temperature were simulated to a ‘medium walking gait’ of hip joint conditions. The mechanical properties of the specimen and the physical properties of the lubricant were characterized before the friction test. Raman analysis was conducted to identify the coating condition both before and after the test. The DLC-coated dimpled surface showed maximum hardness and residual stress. A DLC-coated dimpled surface under an OASF lubricated condition yielded a lower friction coefficient and wear compared to those of plain and dimpled specimens. The higher graphitization of coated materials with increasing load was confirmed by Raman spectroscopy.

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“…The graphitic structure is well known to be responsible for the low friction coefficient of DLC films. 30 Indeed, since graphite easily shears the structure promotes friction reduction. Hydrogen incorporation led to an improvement of the sliding behavior with a decrease in the friction coefficient.…”

Section: à3mentioning

confidence: 99%

Microstructure and mechanical properties of Ti/AlTiN/Ti-diamondlike carbon composite coatings on steel

et al. 2010

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Ti/AlTiN/Ti-diamondlike carbon (DLC) composite coatings were deposited by midfrequency magnetron sputtering and Hall ion source-assisted deposition on high-speed steel W 18 Cr 4 V substrates. The coating microstructure and mechanical properties, including hardness, elastic modulus, coefficient of friction, and wear properties were investigated by scanning electron microscopy, Raman spectroscopy, scratch and ball-ondisk friction tests, respectively. Fairly smooth composite coating with strong interfacial adhesion and good mechanical properties was produced. The substrate bias increases sp 3 bonds contents in the DLC layer, thus coating hardness increased from 14 to 24 GPa and elastic modulus from 190 to 230 GPa with the increased substrate bias. Adhesion of interfaces between Ti-DLC and AlTiN layer, AlTiN and the steel substrate decreased with the substrate bias. The coefficient of friction is between 0.10 and 0.15, except when the substrate bias is 500 V, it is 0.2. Composite coating wear resistance increased with the substrate bias.

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Raman analysis of DLC coated engine components with complex shape: Understanding wear mechanisms

Cited by 28 publications

References 17 publications

Tribological performance and tribochemical processes in a DLC/steel system when lubricated in a fully formulated oil and base oil

Tribological performance and tribochemical processes in a DLC/steel system when lubricated in a fully formulated oil and base oil

Tribological investigation of diamond-like carbon coated micro-dimpled surface under bovine serum and osteoarthritis oriented synovial fluid

Microstructure and mechanical properties of Ti/AlTiN/Ti-diamondlike carbon composite coatings on steel

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