Effect of carburizing treatment on microstructural, mechanical and tribological performances of Cr doped DLC coating deposited on Ti6Al4V alloy

Weicheng, Kong; Zhou, Yu; Hu, Jun

doi:10.1016/j.ceramint.2021.08.355

Cited by 27 publications

(7 citation statements)

References 47 publications

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“…It follows from Figure 6 that the coating B had the highest friction coefficient, which had the highest wear and the most intense transition from a diamond-like structure to a graphite-like structure. This was inconsistent with the assumption that DLC graphitization leads to an improvement in tribological characteristics [15,16].…”

Section: Resultsmentioning

confidence: 75%

“…It is often postulated that friction is reduced by the formation of a solid lubricant on the DLC surface due to graphitization [15,16] or coating doping with various elements [16,17]. Graphitization of surface layers, as one of the main mechanisms for reducing friction in contact with DLC, occurs due to the amorphization of surface carbon layers and the formation of clusters with a graphite-like structure under the action of high pressures and temperatures in real contact zones [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Effect of sp3–sp2 Transformation on the Wear Rate of the DLC Coating

et al. 2022

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Based on the methods of non-equilibrium thermodynamics, it was found that the implementation of spontaneous processes with positive entropy production during friction leads to an increase in the wear intensity. Non-spontaneous processes with negative entropy production lead to a decrease in wear intensity. The tribological characteristics of diamond-like carbon (DLC) with different silicon content were studied. The wear intensity practically does not correlate with the friction coefficient. It is shown that DLC with the highest content of diamond-like inclusions (sp3) in the coating has the highest wear rate. In the same DLC, the most intense sp3–sp2 transformation during friction was observed. The sp3–sp2 transformation is a spontaneous process.

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Section: Resultsmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Effect of sp3–sp2 Transformation on the Wear Rate of the DLC Coating

et al. 2022

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“…The carbon for the DLC is obtained both from a graphite target using sputtering, and from an acetylene plasma discharge. A low activity on the Cr target during this last step provides the Cr-doping to obtain what is known as a-C:H: Cr (Chromium doped hydrogenated amorphous carbon) [19][20][21].…”

Section: Methodsmentioning

confidence: 99%

Tribological behaviour of a multilayer CrN/DLC coating obtained using PVD-MS

Delfin¹,

Brühl²

2022

Surf. Topogr.: Metrol. Prop.

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Diamond-like Carbon (DLC) coatings are used as protective layers for steel components due to their hardness, chemical inertia and interesting tribological properties. Reducing wear and friction coefficient is of great importance for industries today in order to increase energy efficiency and reduce harmful emissions to the environment. In this paper, a multilayer CrN/DLC coating is analysed. It was deposited using a commercial Plasma Enhanced Magnetron Sputtering over nitrided and not nitrided mild-alloy steel AISI 4140, produced for the first time in Argentina, at the firm Coating.Tech by Flubetech-Tantal. The base of the coating is an anchor layer made of CrN and the top layer is a chromium-dopped hydrogenated amorphous carbon (a-C:H:Cr), which provides excellent tribological properties. Wear tests were carried out in a Pin-on-Disk apparatus, using an Al2O3 ball as counterpart, with Hertzian contact stress from 1370 up to 1460 MPa. The friction coefficient was μ~0.1, which is 80% less than the untreated steel and the wear volume loss was reduced eight times. The adhesion was evaluated by means of Scratch Test, where major improvement was noticed in the samples which were nitrided as pre-treatment, increasing critical load from 25 N up to 65 N.

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“…The D-peak ('disorder') related to the carbon disordered structure (lower wave number at 1335 ~ 1455 cm − 1 ) corresponded to the breathing vibration mode of the sp 2 sites in aromatic rings. The G-peak ('graphite') at a higher wave number (1552 ~ 1580 cm − 1 ) of graphitic carbon was assigned to the bond stretching vibration for all pairs of sp 2 carbon elements in both the aromatic rings and carbon atomic chains [27,32]. A higher ratio of metallic doping resulted in decreased scattering intensity of the DLC lms, which should cause increased sp 2 and less sp 3 content in the metal-doped DLC lm [33].…”

Section: Surface Morphologies and Microstructurementioning

confidence: 99%

Characteristics of DLC films doped with multi-element alloy

Chen

Tsao

et al. 2022

Int J Adv Manuf Technol

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Multi-element alloy doped diamond-like carbon (DLC) lms were coated using sputtering with a (AlCrNbSiTiV) target. TEM and XRD results indicated DLC lm had an amorphous compound feature incorporating poly-crystalline phases around the face-center-cubic structure, which were embedded into the amorphous carbon matrix. The Raman spectra and mechanical characteristics of the DLC lm sample were associated with concentration changes in the carbon and the multi-element alloy doped in the DLC lms, which depended on the DC power. This investigation indicated that improved mechanical properties, including hardness and the elastic recovery rate, can be obtained from the multi-element alloy doped DLC lm coated with proper DC sputtering power. These results demonstrated a proper DC power modi es the structure of multi-element alloy doped DLC lm and improves its mechanical performance. This study should pave the way for the development of DLC lm and elevate its application in various industries.Code availability: Not applicable.

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Effect of carburizing treatment on microstructural, mechanical and tribological performances of Cr doped DLC coating deposited on Ti6Al4V alloy

Cited by 27 publications

References 47 publications

Effect of sp3–sp2 Transformation on the Wear Rate of the DLC Coating

Effect of sp3–sp2 Transformation on the Wear Rate of the DLC Coating

Tribological behaviour of a multilayer CrN/DLC coating obtained using PVD-MS

Characteristics of DLC films doped with multi-element alloy

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