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Design of low-friction PVD coating systems with enhanced running-in performance - carbon overcoats on TaC/aC coatings
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Tribomaterialgruppen, Tribomaterials group)
Nagoya University, Department of Mechanical Science and Engineering, Nagoya, Japan. (Advanced Materials and Manufacturing Laboratory)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Tribomaterialgruppen, Tribomaterials group)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Tribomaterialgruppen, Tribomaterials group)
2012 (English)In: Nordtrib 2012, 15th Nordic Symposium on Tribology: Final papers, 2012Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

The widespread use of low friction PVD coatings on machine elements is limited by the high costs associated with fulfilling the demands on the surface quality of both the supporting substrate and the counter surface. In this work, an attempt is made at lowering these demands, by adding a sacrificial carbon overcoat to a TaC/aC low friction coating. Both coatings were deposited by planar magnetron DC sputtering, as separate steps in a single PVD-process. Coatings were deposited on substrates of two different surface roughnesses, in order to test the ability of this coating system to function on rougher substrates. Reciprocating ball on disc tests were performed, using balls with two different surface roughnesses. The worn surfaces were investigated using 3-D profilometry and SEM. The ability of the different overcoats to initially reduce the roughness of both the coated surface and the counter surface and to produce stable, low-friction conditions was examined for the different initial roughnesses. The implications for design of efficient run-in coatings for various systems are discussed.

Place, publisher, year, edition, pages
2012.
Keyword [en]
Low friction coatings, surface roughness, running in, PVD DLC
National Category
Tribology
Research subject
Engineering Science with specialization in Tribo Materials; Engineering Science with specialization in Materials Science
Identifiers
URN: urn:nbn:se:uu:diva-181805OAI: oai:DiVA.org:uu-181805DiVA: diva2:559585
Conference
Nordtrib 2012, 15th Nordic Symposium on Tribology, 12-15 June 2012, Trondheim, Norway
Available from: 2012-10-09 Created: 2012-10-01 Last updated: 2012-10-31

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Nyberg, HaraldWiklund, UrbanJacobson, Staffan

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