Estimations of load carrying capacity in diamond-like carbon coated systems

H Ronkainen, J Koskinen, S Varjus, K Holmberg

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Diamond-like carbon (DLC) coatings have shown excellent tribological properties in laboratory tests. The coatings have also been introduced to several practical applications. However, the functional reliability of the coatings is often weakened by adhesion and load carrying capacity related problems. In this study the load carrying capacity of the coating-substrate system has been evaluated.

The DLC coatings were deposited on stainless steel, tool steel, cemented carbide and alumina by using two different deposition techniques: the hydrogen-free carbon coatings were deposited by a pulsed vacuum are discharge method and the hydrogenated carbon films by r.f. plasma method. The load carrying capacity of the system was evaluated by using a scratch test, Rockwell-C indentation test and ball-on-disc test. The effect of substrate material, substrate hardness, coating type and coating thickness was studied. An increase in substrate hardness increased the load carrying capacity for the coated systems as expected. The two coating types had different performance under load due to their different mechanical properties. For the load earring capacity evaluations ball-on-disc configuration is suggested.

Original languageEnglish
Title of host publicationCOST 516 TRIBOLOGY SYMPOSIUM
EditorsH Ronkainen, K Holmberg
PublisherTechnical Research Centre of Finland
Number of pages10
ISBN (Print)951-38-4573-7
Publication statusPublished - 1998
MoE publication typeA4 Article in a conference publication
EventCOST 516 Tribology Symposium - Espoo, Finland
Duration: 14 May 199815 May 1998

Publication series

ISSN (Print)0357-9387


ConferenceCOST 516 Tribology Symposium


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