The influence of carbon based coatings and surface finish on the tribological performance in high-load contacts

The effect of surface finish with two types of carbon based coatings was evaluated in rolling contact twin disc tests. The surface finish grades represented the ground surface, and two polished surfaces providing average surface roughness values of Ra 0.128µm and 0.030µm. The twin disc test paramete...

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Bibliographic Details
Published in:Tribology international 2016-04, Vol.96, p.402-409
Main Authors: Ronkainen, H., Elomaa, O., Varjus, S., Kilpi, L., Jaatinen, T., Koskinen, J.
Format: Article
Language:English
Subjects:
Carbon
Coating
Coatings
Contact
Contact pressure
Disks
Friction
Polishing
Surface finish
Surface roughness
Ultrasonic testing
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Summary:The effect of surface finish with two types of carbon based coatings was evaluated in rolling contact twin disc tests. The surface finish grades represented the ground surface, and two polished surfaces providing average surface roughness values of Ra 0.128µm and 0.030µm. The twin disc test parameters were selected to represent the contact parameters of practical gear contacts with the maximum contact pressure of 1.7GPa. The micropitting could be prohibited by polishing the surfaces or by using surface coatings. With the optimised combination of surface roughness and carbon coating the reduction of 27% in friction coefficient could be achieved with improved wear performance in twin disc tests. •We studied the effect of surface roughness on thin film performance.•Smooth surface roughness reduces friction in rolling contact.•Smooth surface improved the coating performance in rolling contact.•Friction reduction of about 27% was achieved with optimised coated surface.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2015.04.019