Influences of ceramic mating balls on the tribological properties of Cr/a-C coatings with low chromium content in water lubrication

Jin

Ding

et al. 2020

Surface Engineering

Self Cite

In order to optimize the counterpart material and subsequently improve the tribological properties of CrSiBCN coatings on transmission components in sea water, the friction behaviour of CrSiBCN coatings sliding against two ceramics and two metals was investigated. The overall relative index (RI o ) of friction coefficient and wear rate was used as evaluation criterion. Experimental results showed that CrSiBCN/Al 2 O 3 and CrSiBCN/brass tribopairs presented the worse tribological properties than the average level indicated as positive RI o (1.64 and 0.22). In contrast, CrSiBCN/SiC and CrSiBCN/GCr15 tribopairs presented the better tribological properties than the average level indicated as negative RI o (−1.45 and −0.39). On this basis, since the lubrication effect of the silica gel generated from the hydration of SiC, CrSiBCN/SiC tribopair exhibited both lower friction coefficient and lower coatings wear rate than the average values. It was indicated that SiC was the suitable counterpart material matching with CrSiBCN coatings in sea water.

Section: Friction Behavioursupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Friction and wear performance of CrSiBCN coatings sliding against ceramic and metal counterparts in sea water

Jin

Ding

et al. 2020

Surface Engineering

Self Cite

“…In deionized water, Ar-DLC:H coatings deposited at a bias voltage of −3.0 kV (a range from −0.5 to −3.0 kV) exhibited the lowest friction coefficient and coating wear rate (0.1 and 8.0 × 10 −9 mm 3 /Nm) [28], whilst Si-DLC:H (3.9 at % Si)/Si 3 N 4 and Si-DLC:H (7.3 at % Si)/AISI 440C tribopairs presented the lowest friction coefficient of 0.005 and 0.09, respectively [29,30]. In addition, Zhou et al [31][32][33] pointed out that an incorporation of Ti at 0.98 at % could reduce the friction coefficient and wear rate of a-C/Al 2 O 3 tribopair, while an incorporation of Cr at 3.0 at % could shorten the running-in distance of the a-C/stainless steel (SUS440C) tribopair from 150 m to 50 m in deionized water. Nevertheless, a higher doping content of Ti (>0.98 at %) or Cr (>3.0 at %) would deteriorate the tribological properties of a-C coatings under water lubrication; even a premature failure.…”

Section: Architecturementioning

confidence: 93%

Progress in Tribological Properties of Nano-Composite Hard Coatings under Water Lubrication

Zhou

2017

Lubricants

Self Cite

Abstract:The tribological properties, under water-lubricated conditions, of three major nano-composite coatings, i.e., diamond-like carbon (DLC or a-C), amorphous carbon nitride (a-CN x ) and transition metallic nitride-based (TiN-based, CrN-based), coatings are reviewed. The influences of microstructure (composition and architecture) and test conditions (counterparts and friction parameters) on their friction and wear behavior under water lubrication are systematically elucidated. In general, DLC and a-CN x coatings exhibit superior tribological performance under water lubrication due to the formation of the hydrophilic group and the lubricating layer with low shear strength, respectively. In contrast, TiN-based and CrN-based coatings present relatively poor tribological performance in pure water, but are expected to present promising applications in sea water because of their good corrosion resistance. No matter what kind of coatings, an appropriate selection of counterpart materials would make their water-lubricated tribological properties more prominent. Currently, Si-based materials are deemed as beneficial counterparts under water lubrication due to the formation of silica gel originating from the hydration of Si. In the meantime, the tribological properties of nano-composite coatings in water could be enhanced at appropriate normal load and sliding velocity due to mixed or hydrodynamic lubrication. At the end of this article, the main research that is now being developed concerning the development of nano-composite coatings under water lubrication is described synthetically.

“…(State Key Laboratory of Mechanics and Control of Mechanical Structures, NUAA, China) reported that the tribological performance of the amorphous carbon lms with signicant sp 2 carbon could be modied by Cr, which was also affected by different counterparts. 26,27 In addition, a suitable interlayer on the substrate surface could signicantly improve the adhesion force of a GLC lm. The most common metallic candidates for the adhesion interlayer were Ti, Cr and W. 28,29 Field et al also showed that GLC-coated tool steel with a Cr interlayer exhibited high load-bearing capacity and excellent tribological performance in air, water and oil.…”

Section: Introductionmentioning

confidence: 99%

An analysis of the tribological mechanism of GLC film in artificial seawater

Chen

et al. 2016

RSC Adv.