Friction and Wear Properties of Micro Textured DLC Coated Surfaces in Boundary Lubricated Sliding

Pettersson, Ulrika; Jacobson, Staffan

doi:10.1023/b:tril.0000044504.76164.4e

Cited by 254 publications

(130 citation statements)

References 10 publications

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“…After measuring film thickness in the reciprocating contact using a capacitance technique, they concluded that the addition of certain patterns can increase film thickness at given loads. A further notable observation, in agreement with experimental measurements, reported by the current authors [9] and Petterson and Jacobson [20], was that pockets parallel to the direction of sliding result in higher friction and lower film thickness.…”

Section: Introductionsupporting

confidence: 79%

The Transient Friction Response of a Laser-Textured, Reciprocating Contact to the Entrainment of Individual Pockets

et al. 2016

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To shed light on the mechanisms with which surface texture improves the tribological performance of piston-liner contacts, we have measured the transient friction response as individual pockets pass through a reciprocating sliding contact. Tests were performed at different sliding speeds and results compared to those from a non-textured, reference specimen under different lubrication regimes. At low speed when the contact is in the boundary regime, friction force falls abruptly as each pocket leaves the contact zone, before gradually returning to an approximately steady-state value. This suggests that each pocket acts to temporarily increase the film thickness, which then decays to its non-textured value as oil is squeezed out. At higher speeds, friction is seen to reduce in a stepwise fashion, since the period between pockets being entrained is less than the time taken for the film to decay. In addition, friction results obtained when the contact is operating in the middle of the mixed regime point to a temporary film thickness collapse as the pocket enters the contact, and this agrees with recent modelling predictions. At higher speeds, the compound effect of successive pockets is to shift the contact to the right on Stribeck curve. These results imply that each pocket gives rise to an increase in film thickness that is both short-lived and small in magnitude (we estimate a few tens of nm). However, the resulting effect on friction can be significant (up to 82 % in this study) for two reasons: (1) provided the pocket frequency is sufficiently high, each successive pocket entrainment builds the film up without there being time for it to reduce back to its steady-state value; (2) when the contact is in the mixed regime, the Stribeck curve is at its steepest and friction is therefore most sensitive to film thickness changes. This has important practical implications in that pocket spacing on piston liners should be varied as a function of reciprocating sliding speed.

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Section: Introductionsupporting

confidence: 79%

The Transient Friction Response of a Laser-Textured, Reciprocating Contact to the Entrainment of Individual Pockets

et al. 2016

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“…To gain insights into these effects, which cannot be explained by the lubricant replenishment mechanisms described above, individual entrainments of different pocket geometries were observed. In the case of pockets oriented parallel to the direction of sliding, known to increase friction relative to a non-textured reference [13,58,59], oil could be seen draining out of the contact as the pocket forms a connection between the high pressure inlet and the sub-ambient cavitated region thus collapsing the film. However, during the entrainment of texture oriented transverse to the direction of sliding, cavitation bubbles were observed within each pocket, which supports the mechanism of inlet suction, previously identified by Olver and Fowell [28,29].…”

Section: Discussionmentioning

confidence: 99%

Looking into a laser textured piston ring-liner contact

Vlădescu

Ciniero

Tufail

et al. 2017

Tribology International

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“…If the grooves were parallel to the motion direction, the friction coefficient increased, with poor wear resistance. Pettersson and Jacobson [22] researched the effect of the angle of the groove on the tribological behavior using a ball-on-disc friction testing machine under boundary lubrication conditions. The results showed that when the grooves were parallel with the direction of movement, the friction force and wear loss were much larger than when the grooves were perpendicular to the direction of motion.…”

Section: Introductionmentioning

confidence: 99%

“…"Stick-slip" friction phenomena can be observed during sliding, depending on the surface topological pattern. To improve the wear resistance of mechanical parts, great efforts have been theoretically and experimentally made to investigate the orientation effects between frictional motion direction and surface texture units or patterns, on the tribological behavior under different lubrication conditions [18][19][20][21][22][23]. Yuan et al [20] studied the orientation effects of grooves on the friction performance.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Rotating Direction on the Tribological Behavior of Grey Cast Iron with Curve Distributed Pit Textured Surface

Sun

Xie

Kelly

et al. 2017

Mathematical Problems in Engineering

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To investigate the influence of surface features, in the form of pits, on the wear resistance of grey cast iron (GCI), a finite element model of the pin-on-disc friction system, with pits distributed in a curved radial direction, was developed using APDL programming and the tribological behavior of textured surfaces was studied. The influence of relative rotation direction between the disc and the pin on the thermal behavior of the friction system under dry wear conditions was researched. GCI and C30E steel samples with pit textured surfaces were manufactured using laser marking equipment and tested using a tribology wear testing rig. The mass losses were measured and the worn surfaces were characterized. The influence of different rotation directions on the tribological behavior of the pit textured surfaces was also investigated. The simulation and test results revealed that rotation direction was a crucial parameter in determining the tribological behavior of surfaces with these features, regardless of the material. Under the conditions tested, when the pin rotated anticlockwise, the samples showed better friction and wear behavior than when the pin rotated clockwise. These results can provide important guidance for the optimization of the design of heavy-load brake systems and other similar applications.

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Friction and Wear Properties of Micro Textured DLC Coated Surfaces in Boundary Lubricated Sliding

Cited by 254 publications

References 10 publications

The Transient Friction Response of a Laser-Textured, Reciprocating Contact to the Entrainment of Individual Pockets

The Transient Friction Response of a Laser-Textured, Reciprocating Contact to the Entrainment of Individual Pockets

Looking into a laser textured piston ring-liner contact

The Influence of Rotating Direction on the Tribological Behavior of Grey Cast Iron with Curve Distributed Pit Textured Surface

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