Wear of AlCrN and CrAlSiN Coatings Applied to Nonstandard Involute Gears

Wear of nonstandard involute gears with two types coatings, AlCrN and CrAlSiN, was studied. The coatings were applied by cathodic arc deposition. tested using a Niemann tester at graduated load up to the 12th stage compared noncoated gears. Both Biogear S150 gear oil PP90 universal hydraulic during these tests. thickness deposited wear teeth studied SEM their chemical compositions determined EDS analysis. Maximal contact pressure 1350 MPa calculated in region tooth flank stage. frictional stress also on flank. resistance against evaluated based critical weight loss mainly surface roughness exceeded 10th for For CrAlSiN 11th nonuniform along height tooth. characterized fragmentation thin subsequent detaching fragments from steel substrate. substrate worn microcutting, which caused highest surface. On pitch, protrusions smoothed, cracked locally detached subsequently. face, smoothed but remained compact without crack initiations. experimental oils, PP90, proved be suitable tests as temperatures did not exceed limit value 80 °C.