Materials

Wissenschaftliche Publikation

Effect of the type of elastomeric substrate on the microstructural, surface and tribological characteristics of diamond-like carbon (DLC) coatings

Publikation aus Materials

Thirumalai S., Hausberger A., DI DDr. mont. Jürgen Lackner, DI Dr. mont. Wolfgang Waldhauser, Schwarz Th.

Surface and Coatings Technology Volume 302, Pages 244-254 , 6/2016

Abstract:

Diamond-like carbon (DLC) coatings are deposited by a hybrid process involving plasma-assisted chemical vapor deposition (PACVD) and pulsed direct-current (DC) magnetron sputtering on three different elastomer substrates, namely, nitrile butadiene rubber (NBR), fluoroelastomer (FKM) and thermoplastic polyurethane (TPU), under self-biased conditions. These DLC coatings and the corresponding elastomer substrates are characterized using confocal optical microscopy, scanning electron microscopy, atomic force microscopy and a contact angle goniometer. Tribological tests are performed using ball-on-disc configuration at a fixed load of 1 N under ambient conditions. Friction reduction after deposition of DLC coatings is highly effective in NBR (56.4%), followed by that in FKM (49.8%) and TPU (28.8%) substrates. Best wear resistance was shown by DLC-coated FKM, which was followed by DLC-coated NBR and TPU. Transfer film formation is believed to be the main tribological mechanism favoring better frictional properties of DLC-coated elastomers. This study elucidates the possible reasons for the differing frictional and wear performance of the three different DLC-coated elastomers under consideration.