20.500.12556/RUL-106728 Influence of the contact parameters and several graphite materials on the tribological behaviour of graphite/copper two-disc electrical contacts This paper reports on the performance and tribological mechanisms in a newly developed design for an electrical sliding contact in terms of sliding velocity, normal force and electrical current during 24-h experiments. Copper discs were run against hard-carbon graphite, electrographite and polymer-bonded graphite. The average wear rates of the copper discs against the three graphite materials were reduced to 10[-8] and 10[-7] mm3/Nm, and the graphite discs to 10[-6] mm3/Nm, which is for 1 and 1-2 orders of magnitude less, than copper slip-rings and carbon brushes in conventional systems, respectively. The coefficient of friction was 0.2-0.4, depending on the conditions, which is comparable to the values of conventional electrical sliding contact. Tribofilms are generated in almost all contacts, and crucially determine the contact performance. The polymer-bonded-graphite/Cu formed the most compliant tribofilms that unify and decrease the local contact pressures and temperatures, and have the largest surface coverage that reduces the wear and contact resistance, which in turn reduces the contact instabilities and so the friction. electrical contacts copper graphite friction wear electrical current električni kontakti baker grafit trenje obraba električni tok true false true Angleški jezik Slovenski jezik Članek v reviji 2019-03-14 09:33:31 2019-03-14 09:33:34 2025-03-04 10:56:01 0000-00-00 00:00:00 2018 0 0 Str. 192-205 Vol. 126 Oct. 2018 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 2022-10-31 539.92:621.8(045) 0301-679X 10.1016/j.triboint.2018.05.024 16085531 26558976 RAZ_Kalin_Mitjan_i2018.pdf RAZ_Kalin_Mitjan_i2018.pdf 1 E9B96926942BD3C85C802DE981E6D005 95cd468f7b7650e8c83440c0f2ed1f0c834abf6470dd2960a50f9a0273b57b37 5d78f90e-a1b6-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=117495 https://www.sciencedirect.com/science/article/pii/S0301679X18302524?via%3Dihub 1 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=117494 Fakulteta za strojništvo 0 0 0