Nanodiamond-based tribosystems

Amaral, M.; Abreu, C.S.; Fernandes, A.J.S.; Oliveira, F.J.; Gomes, J.R.; Silva, Rui

doi:10.1016/j.surfcoat.2009.11.015

Cited by 16 publications

(5 citation statements)

References 25 publications

(41 reference statements)

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“…A normal load from small to large was applied to the diamond film, and the dry friction and wear tests were carried out for 30 min. If the film delamination was observed, the test was ended [ 24 , 25 ]. As shown in Figure 7 , the normal loads of film separation of A1, A3, D1, and D3 were 27.5 N, 40 N, 30 N, and 80 N, respectively.…”

Section: Resultsmentioning

confidence: 99%

Tribological Performance of Diamond Films with Different Roughnesses of Silicon Nitride Substrates and Carbon Source Concentrations

et al. 2022

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Diamond films were deposited on silicon nitride (Si3N4) substrates with three different roughnesses using the method of hot-filament chemical vapor deposition (HFCVD). The tribological properties of the film were studied by changing the deposition time, deposition distance, and methane (CH4) concentration. The friction coefficient, delamination threshold load, and wear rate of the diamond films were tested and calculated using the reciprocating friction and wear test under dry friction conditions. The results show that, when the deposition time is 12 h, the bonding force of the film is the lowest and the friction coefficient is the largest (0.175, 0.438, and 0.342); the deposition distance has little effect on the friction performance. The friction coefficients (0.064, 0.107, and 0.093) of nano-diamond films (NCD) prepared at a 40 sccm CH4 concentration are smaller than those of micro-diamond films (MCD) prepared at a 16 sccm CH4 concentration. The load thresholds before delamination of Ra 0.4 μm substrate diamond film are as high as 40 N and 80 N, whereas the diamond films deposited on Ra 0.03 μm substrates have lower wear rates (4.68 × 10−4 mm3/mN, 5.34 × 10−4 mm3/mN) and low friction coefficients (0.119, 0.074, 0.175, and 0.064). Within a certain load range, the deposition of a diamond film on a Ra 0.03 μm Si3N4 substrate significantly reduces the friction coefficient and improves wear resistance. Diamond film can improve the friction performance of a workpiece and prolong its service life.

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Section: Resultsmentioning

confidence: 99%

Tribological Performance of Diamond Films with Different Roughnesses of Silicon Nitride Substrates and Carbon Source Concentrations

et al. 2022

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“…The ND composites are deposited in the pits during sliding, resulting in a smoother surface and contributing to sustain the oil film. Thus, the friction and wear of the friction pair can be reduced [46].…”

Section: Resultsmentioning

confidence: 99%

Tribological performance of nano-diamond composites-dispersed lubricants on commercial cylinder liner mating with CrN piston ring

Huang

Wang

Yuan

et al. 2020

Nanotechnology Reviews

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AbstractThis work investigated the effect of nanodiamond (ND) additives on the tribological properties of CrN-coated piston ring mating with the chromium-plated and BP alloy iron cylinder liners, which is one of the key friction pairs in the internal combustion engines. To enhance the dispersion of the NDs in the base oil, the surface of ND particles was modified with polyaniline via in situ polymerization. The friction and wear as well as the scuffing characteristics of the friction pair lubricated with different contents of ND composite-added base oil were evaluated by using the reciprocating tribotests, which are close to the actual conditions. The wear surface morphologies and elements distribution were analyzed to explore the wear behaviors and the associated mechanisms of friction pairs under the lubrication incorporated with the ND composites. The results show that the ND additive is beneficial for the pair of Cr liner and CrN-coated piston ring in the friction and wear as well as scuffing properties, and the best concentration of ND additive is expected to be around 1 wt%. But for the BP liner, the developed nanocomposite has a negative impact. The friction force and the wear loss of the pair lubricated by the ND composite-added oil are even worse than that tested with the base lubricating oil.

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“…Amaral diamond; steady-state friction coeffi cients of 0.01-0.05 in unlubricated environments and water-lubricated environments were observed. 18 The wear rate under water lubrication was 1.9 × 10 −10 mm 3 N −1 m −1 ; testing in Hank's balanced salt solution revealed similar friction (0.06) and wear data. Testing in dilute fetal bovine serum revealed a higher coeffi cient of friction (0.10); this fi nding was associated with protein attachment.…”

Section: Introductionmentioning

confidence: 84%