Evaluation of the friction of WC/DLC solid lubricating films in vacuum

Liu, Y.; Gubisch, M.; Haensel, Thomas; Spieß, Lothar; Schaefer, J.A.

doi:10.1016/j.triboint.2006.02.061

Cited by 22 publications

(14 citation statements)

References 16 publications

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“…The type of oscillations observed for this sample is not without precedent in carbonaceous films. Multilayer films composed of carbon and other tribological materials also show this behavior 39–42 . The true cause of the uneven friction coefficient is not agreed upon, but an oft‐quoted theory suggests the formation of a thin transfer layer on the countermedium 40 .…”

Section: Discussionmentioning

confidence: 99%

“…Multilayer films composed of carbon and other tribological materials also show this behavior. [39][40][41][42] The true cause of the uneven friction coefficient is not agreed upon, but an oft-quoted theory suggests the formation of a thin transfer layer on the countermedium. 40 More experimentation would be needed to locate the lubricating layer in this case.…”

Section: Number Of Revolutions Coefficient Of Frictionmentioning

confidence: 99%

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Tribology–Structure Relationships in Silicon Oxycarbide Thin Films

Ryan

Colombo

Howell

et al. 2009

Int J Applied Ceramic Tech

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Silicon oxycarbide is a versatile material system that is attractive for many applications because of its ability to tune properties such as chemical compatibility, refractive index, electrical conductivity, and optical band gap through changes in composition. One particularly intriguing application lies in the production of biocompatible coatings with good mechanical properties. In this paper, we report on the wide range of mechanical and tribological property values exhibited by silicon oxycarbide thin films deposited by reactive radio frequency magnetron sputtering. Through a change in oxygen partial pressure in the sputtering plasma, the composition of the films was controlled to produce relatively pure SiO2, carbon-doped SiC, and compositions between these limits. Hardness values were 8–20 GPa over this range and the elastic modulus was measured to be between 60 and 220 GPa. We call attention to the fit of the mechanical data to a simple additive bond-mixture model for property prediction. Tribological parameters were measured using a ball-on-disk apparatus and the samples exhibited the same general trends for friction coefficient and wear rate. One film is shown to produce variable low friction behavior and low wear rate, which suggests a solid-state self-lubrication process because of heterogeneity on the nanometer scale

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Section: Discussionmentioning

confidence: 99%

Section: Number Of Revolutions Coefficient Of Frictionmentioning

confidence: 99%

Tribology–Structure Relationships in Silicon Oxycarbide Thin Films

Ryan

Colombo

Howell

et al. 2009

Int J Applied Ceramic Tech

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“…A certain type of WC/C multilayer coating was designed especially for nanopositioning applications [9]. Preliminary tribological tests of this coating on single crystal silicon substrates with a RMS surface roughness of less than 1 nm were conducted under ambient [10] and vacuum conditions [11]. These tests demonstrated the potential of this type of coating for nanopositioning systems.…”

Section: Introductionmentioning

confidence: 99%

Friction and Wear Properties of WC/C Nano-Scale Multilayer Coatings on Technical Surfaces

et al. 2011

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This article reports on the tribological performance of a WC/C multilayer coating with a periodicity WC/C = 15/5 nm deposited on bearing steel substrates. These substrates were initially polished to achieve different RMS roughness values ranging from 15 to 900 nm. Tribological tests were performed using a precision reciprocating microtribometer under ambient conditions with a steel ball as a counter-sample. The worn sample surfaces were examined by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDAX). The results indicate that the combined effects of the real contact area, lubricating effect of the coating, as well as the formation of a transfer layer and its subsequent removal, all contribute to a dependence of surface roughness on the coefficient of friction (CoF).

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“…The high friction coefficient for the bare TiC/a-C:H film in high vacuum conditions demonstrated that the high vacuum environment was not beneficial for the formation of stable transfer films [50]. However, it was expected that the solid-liquid duplex lubricating coating could overcome this problem by improving the synergy lubrication effect between the solid lubricant and the liquid lubricant.…”

Section: Raman Characterizations On the Worn Track Of Coatings And Trmentioning

confidence: 99%