20.500.12556/RUL-144648 Influence of graphite content on the tribological properties of plasma sprayed alumina-graphite coatings The main aim of this research was to investigate the influence of graphite as an additive to a plasma-sprayed alumina coating matrix for tribological trends. For the deposition process, pure alumina and alumina with graphite (5%, 10% and 15%) weight percentage powders were used. The graphite-modified alumina coatings were formed on steel substrates by atmospheric plasma spraying using an air-hydrogen plasma. The influence of graphite content on the elemental composition, phase structure, friction coefficient, and specific wear rate was investigated. It was obtained that the addition of graphite enhanced the γ-Al2O3 phase content in the as-sprayed coatings. The highest γ-Al2O3 phase fraction was obtained when the amount of graphite in the feedstock powders was 10 wt.%. The elemental composition results indicated that the concentration of carbon in the alumina-graphite coatings was up to six times lower in comparison to the initial feedstock, and had varied from ∼1.7 to 2.45 wt.%. The incorporation of graphite slightly reduced the friction coefficient of the composite coatings due to the formation of a self-lubricating layer under dry-sliding conditions. The specific wear rates were in the range of ∼10−6 mm3/(Nm) for the alumina-graphite composite coatings, which were similar to the alumina coating, and were an order lower compared to the wear rate of steel. plasma spraying aluminium oxide alumina-graphite coatings friction wear resistance raman spectroscopy plazemsko pršenje aluminijev oksid alumina-grafitne prevleke trenje odpornost proti obrabi ramanska spektroskopija true false true Angleški jezik Slovenski jezik Članek v reviji 2023-03-07 08:04:48 2023-03-07 08:04:55 2023-03-08 03:33:15 0000-00-00 00:00:00 2023 0 0 13 str. Vol. 38, art. 102763 Jun. 2023 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 2024-02-24 531.43:539.92 2468-0230 10.1016/j.surfin.2023.102763 144060931 Marcinauskas_...-_Influence_of_graphite_content_on_the_tribological_properties_of_plasma_sprayed_alumina-graphite_coatings.pdf Marcinauskas_...-_Influence_of_graphite_content_on_the_tribological_properties_of_plasma_sprayed_alumina-graphite_coatings.pdf 1 A7094273C0B9113BCD3CA602EDD3F103 39f964f91c974865bf9b562b686f4d41cb4ff492c25acdefc2a3e4a0d6651e96 8e750519-bcb7-11ed-a314-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=167089 https://www.sciencedirect.com/science/article/pii/S2468023023001335 1 5583c79f-bcb6-11ed-a314-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=167088 Fakulteta za strojništvo 0 0 0