Scratch resistance of superhard carbon coatings – A new approach to failure and adhesion evaluation

Zawischa, Martin; Makowski, Stefan; Schwarzer, Norbert; Weihnacht, Volker

doi:10.1016/j.surfcoat.2016.07.109

Cited by 30 publications

(11 citation statements)

References 17 publications

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“…In the present case, the first critical load corresponds to the formation of the first hairline cracks inclined at 30-40 • with respect to the track direction on the coating surface (Figure 6a). This is consistent with previously described deformation modes [28]. This first critical load is normally associated with the first damage mechanisms appearance due to the scratch of the indenter.…”

Section: Resultssupporting

confidence: 92%

Wear and Fretting Behavior of Cold Sprayed IN625 Superalloy

Cavaliere

Rizzo

Valerini

et al. 2020

Metals

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The wear and fretting behaviour of IN625 cold spray coatings was analysed and the results are presented. The cold spray conditions were selected in order to obtain coatings with minimum porosity and maximum particles splat. This leads to compact and hard deposited material able to resist wear damaging and to dissipate energy during fretting. The coating’s strength was evaluated through nanoindentation that revealed an increased hardness from the surface toward the substrate. This different hardening behaviour from the coating surface toward the substrate leads to increased resistance to fretting and wear as the maximum stresses increase. This was revealed by scratch tests performed at linearly increasing loads that allowed identifying of the damage mechanisms acting on the coating as the triaxial stresses increase. The hardening behaviour of the coating also influenced the fretting behaviour revealed by the weight loss experienced by varying the fretting maximum load.

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Section: Resultssupporting

confidence: 92%

Wear and Fretting Behavior of Cold Sprayed IN625 Superalloy

Cavaliere

Rizzo

Valerini

et al. 2020

Metals

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“…Therefore, to be comparable with results from other works, all the parameters should be identical. Besides, the critical load does not indicate the extension and mode of the adhesive or cohesive failure 15 . Thus, image evaluation of scratch tests performed using different parameters of the deposition process is more valuable than the critical load itself.…”

Section: Resultsmentioning

confidence: 98%

“…The bending cracks at the center of the track are responsible for the adhesion failure of the coating and are caused by the plastic deformation of the substrate and by the tensile stress in front of the indenter. The inclined hair cracks at the edge of the track are formed ahead of the sliding indenter contributing for the coating detachment 15 .…”

Section: Resultsmentioning

confidence: 99%

Wear behavior of Diamond-like Carbon Deposited on Ti6Al4V Prepared with Surface Mechanical Attrition Treatment

et al. 2019

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Surface modification by deposition of hard coatings is a way to overpass the poor wear resistance of some metallic materials and one potential material is the Diamond-Like Carbon (DLC). We investigated the wear behavior, and the adhesion of the DLC deposited on a Ti6Al4V (Ti64) alloy after Surface Mechanical Attrition Treatment (SMAT). The SMAT was applied using 100Cr6 steel balls, and the DLC was deposited through the sputtering method. The nano-hardness was evaluated using a MTS Nano Indenter XP. The adhesion of the DLC was evaluated using a CSM Revetest, and the wear tests were performed in a reciprocating linear tribometer from CSM Instruments. The mean wear rate for the Ti64 was 437x10-6 mm 3 /N/m against 5x10-6 mm 3 /N/m for the Ti64+SMAT+DLC. The SMAT reduced the wear rate of the DLC coating, showing that the SMAT might be a viable treatment with promising results regarding the DLC wear resistance.

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“…The critical load was determined from the AE intensity signals against the normal loads; radial (angular) cracks, lateral (circular) cracks, chipping and breakthrough along the scratch groove were identified in the high magnification of SEM micrographs, while the crack propagation along grain boundaries was observed in the ultrahigh magnification of SEM micrographs. Zawischa et al [57] have studied the adhesion failure of 13 m super-hard carbon coatings on softer steel substrates by using scratch testing. Their view was that the adhesion failure of an ultra-hard thin coating on softer substrate is caused by plastic flow of the substrate and they calculated the stress distribution at the critical load based on Hertz contact mechanics model.…”

Section: Micro-and Nano-scratch Testingmentioning

confidence: 99%

Advances in test and measurement of the interface adhesion and bond strengths in coating-substrate systems, emphasising blister and bulk techniques

et al. 2019

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In this paper, recent advances in the minimum-destructive testing of the adhesion of coating-substrate systems are reviewed, focusing on key techniques such as micro-and nano-scale levels of indentation, scratching, laser-induced wave shock, as well as the blister and buckle approach. Along with adhesion failure tests, the latest and most extensive applications of the adhesion test methods in nano-, micro-and bulkcoating technology and the associated techniques to determine the minimum damage defects left on the coatings are discussed and their use reviewed.

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Scratch resistance of superhard carbon coatings – A new approach to failure and adhesion evaluation

Cited by 30 publications

References 17 publications

Wear and Fretting Behavior of Cold Sprayed IN625 Superalloy

Wear and Fretting Behavior of Cold Sprayed IN625 Superalloy

Wear behavior of Diamond-like Carbon Deposited on Ti6Al4V Prepared with Surface Mechanical Attrition Treatment

Advances in test and measurement of the interface adhesion and bond strengths in coating-substrate systems, emphasising blister and bulk techniques

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