Friction and contact temperature in dry rolling-sliding contacts with MoS2-bonded and a-C:H:Zr DLC coatings

Abstract Gearboxes are usually lubricated with oil or grease to reduce friction and wear dissipate heat. However, gearbox applications that cannot be grease, for example in the space food industry, commonly solid lubricants. Especially lubricants a lamellar sliding mechanism like graphite molybdenum disulfide (MoS 2 ) diamond-like carbon (DLC) coatings can enable very low coefficients of friction. This study investigates temperature behavior surface rolling-sliding contacts application dry gears. In an experimental setup on twin-disk test rig, case-hardened steel 16MnCr5E (AISI5115) is considered as substrate material together amorphous, hydrogenated, metal-containing a-C:H:Zr DLC coating (ZrC g MoS -bonded -BoC). The curves show reduced significantly increased operating area both coatings. Due sufficient electrical insulation -BoC, thin-film measurement-known from contacts-was successfully transfered contacts. results contact measurements reveal pronounced thermal which interefere by accelerated oxidation. shows gears under ambient air conditions challenging tribological requires tailored