Friction and wear behavior of hydrogenated diamond-like carbon coating against titanium alloys under large normal load and variable velocity

Liu, Jun; Zhang, Zhinan; Ji, Zhe; Xie, Youbai

doi:10.1108/ilt-08-2016-0188

Cited by 9 publications

(6 citation statements)

References 31 publications

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“…The ratio of the intensity of the D-spectrum peak to the G-spectrum peak (I D /I G ) for the petroleum coke was as high as 1.36, indicating a poor orientation of its internal structure. However, the I D /I G value of the granular graphite was 0.33, indicating that it had a higher degree of internal ordering than the petroleum coke (Liu et al, 2017). The contents of impurity elements in carbon are given in Table 2.…”

Section: Structure and Composition Of Carbon Materialsmentioning

confidence: 99%

The synergistic effect of carbon materials on properties of copper-based friction materials

Lin

Liu

Wang

et al. 2020

ILT

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Purpose This study aims to investigate the effect of combined use of granular graphite and petroleum coke on the properties of copper-based friction materials and the friction and wear mechanisms. Design/methodology/approach Copper-based friction materials with different proportions of petroleum coke and granular graphite were prepared by using powder metallurgy. The friction surfaces were analyzed. Findings Changing the ratio of petroleum coke/granular graphite affects the formation of oxides and sulfides on the surface of the materials. Increasing the petroleum coke promotes the production of metal sulfide and sulfate in the friction materials and reduces coefficient of friction (COF) and wear. Increasing petroleum coke also increases the amount of carbonic oxide (CO) released during the braking process and promotes the reduction process of iron oxide on the friction surface. Originality/value The synergistic effect of carbon materials on copper-based friction materials was studied in terms of the tribological chemical reaction. This research provides useful information for the selection of carbon materials in friction materials. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-02-2020-0075/

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Section: Structure and Composition Of Carbon Materialsmentioning

confidence: 99%

The synergistic effect of carbon materials on properties of copper-based friction materials

Lin

Liu

Wang

et al. 2020

ILT

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“…The mechanical wear during single SCD grit scratching process is principally produced by grit-workpiece contact form, grit quality, counterpart material, crystallographic orientations and so on (Liu et al, 2017). The influences of contact form on the mechanical wear for steel (Zmitrowicz, 2006) and polymer (Friedrich, 1986) have been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Influence of contact form on mechanical wear characteristics of single diamond scratching on Ta12W

Huang

2020

ILT

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Purpose Mechanical wear is the main wear form of abrasive single crystal diamond (SCD) grit. The mechanical wear of SCD grit has a significant influence on the tool life and machining quality. This paper aims to investigate the influence of grit–workpiece contact form on the mechanical wear characteristics of SCD grit. Design/methodology/approach Three different grit–workpiece contact forms, which involved point/line/face contact forms, are investigated to reveal the wear mechanism of SCD grit scratching on Ta12W. The wear morphology, wear volume and scratching forces are measured, and the stress models of different contact forms are analyzed. Findings The results show that mechanical wear mainly occurs in the grit–workpiece contact area and increases gradually from contact area to entire SCD grit. The scratching forces vary with the mechanical wear progress of SCD grits. The SCD grit with point contact form is the most prone to produce wear. The SCD grit with face contact form can remove more material volume than the other two SCD grits, and it is the most wear resistant. The stress state is closely related with the mechanical wear of SCD grit. The contact form has a significant influence on the mechanical wear of SCD grit. Originality/value The results of this study can provide a theoretical basis for the fabrication of abrasive tools.

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“…The transfer layer is formed by the softer material and transfers to the harder material [18][19][20]. However, oxidation of some materials like aluminum alloy has been proven to affect the friction coefficient and wear rate of DLC film [17,[21][22][23][24].…”

Section: Contentmentioning

confidence: 99%

“…Under oil-lubricated conditions, the hydrogen-free DLC films with lower sp 3 content show higher friction coefficients. This is because the dangling bonds of DLC coatings which adsorb the oiliness agent to reduce the friction are in proportion to the sp 3 content [16,17]. For different types of DLC films, the properties change according to sp 3…”

Section: Introductionmentioning

confidence: 99%

Effect of sp3 Content on Adhesion and Tribological Properties of Non-Hydrogenated DLC Films

Huang

Yuan

2020

Materials

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Non-hydrogenated diamond-like carbon (DLC) films with various ratios of sp3/sp2 were prepared on cemented carbide YG8 with DC magnetron sputtering technology. A pure graphite target was selected as the carbon source. Before DLC deposition, a surface etching pretreatment was carried out by mid-frequency magnetron sputtering method, using Ti atoms to improve adhesion strength. The ratios of sp3/sp2 were adjusted by bias voltages. In order to investigate the effect of the ratio of sp3/sp2 on adhesion and tribological properties, Raman spectra, XPS spectra, adhesion scratch test and ball-on-disk dry friction tests were applied. The results indicated that the ratio of sp3/sp2 fluctuated with bias voltage, increasing in the range of 0.74 to 0.98. The adhesion strength decreased from 31.5 to 18.4 N with the increasing ratio of sp3/sp2, while the friction coefficient rose in DLC-Si3N4 and dropped in DLC-Ti6Al4V. For DLC-Ti6Al4V, the oxidation of Ti6Al4V had a greater influence than graphitization of DLC. The hard oxides of Ti6Al4V broke the graphite transfer layer leading to a high friction coefficient. The wear rate was approximately linearly related to bias voltage. The coefficients of the linear regression equation were influenced by different friction materials. The adhesion strength and the friction coefficient were fitted as a function of the ratio of sp3/sp2.

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Friction and wear behavior of hydrogenated diamond-like carbon coating against titanium alloys under large normal load and variable velocity

Cited by 9 publications

References 31 publications

The synergistic effect of carbon materials on properties of copper-based friction materials

The synergistic effect of carbon materials on properties of copper-based friction materials

Influence of contact form on mechanical wear characteristics of single diamond scratching on Ta12W

Effect of sp3 Content on Adhesion and Tribological Properties of Non-Hydrogenated DLC Films

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