Affiliation:
1. Kielce University of Technology, Faculty of Mechatronics and Mechanical Engineering
2. Warsaw University of Technology, Faculty of Civil Engineering, Mechanics and Petrochemistry
Abstract
This article defines the effect of surface roughness on a selection of tribological properties of systems withAlTiN coatings. Friction-wear tests were carried out on a tribological tester, which operates as a sphere anddisc assembly in a frictional, sliding motion. The tests were conducted under a load of 10 N over a frictiondistance of 1,000 m. Steel discs made of HS6-5-2C with an AlTiN coating and steel balls made of 100Cr6were used for the test Trials were carried out under lubrication conditions with polyalphaolefin oil PAO 8 andpolyalphaolefin oil containing 1.5% zinc dialkyldithiophosphate (ZDDP). The chemical composition of theAlTiN coating was studied using a scanning electron microscope, and the wear marks on the discs and sphereswere observed. The geometric structure of the samples was analysed before and after the geometric structureof the samples using a interferometer, and after tribological tests. Research has shown that surface roughnessaffects tribological properties. For samples with a higher surface roughness (Sa = 0.61 μm) – unpolished discs– lower linear wear values were obtained than for polished discs (Sa = 0.08 μm). After the introduction of thePAO 8 additive with ZDDP, a reduction in linear wear of 33% and 24% was observed for both polished andunpolished surfaces, respectively.