Rolling performance of carbon nitride-coated bearing components in different lubrication regimes

Abstract The performance of carbon nitride ( CN x ) coated roller bearings is investigated, using a micropitting rig. The rolling performance is evaluated using Stribeck test, with a continuously varying rolling speed (0.2 – 2 m/s). Rolling contact fatigue tests with constant speeds (0.5, 1, 2, and 3.5 m/s) are also conducted in order to study the high-cycle performance of the rollers. The obtained Stribeck curve shows that the presence of coatings eliminates run-in, resulting in low friction coefficients ( ∼ 0.08 ). Raman spectroscopy, performed at the wear tracks, reveals that CN x maintain stable chemical state. Coatings show abrasion although the wear rate is not detrimental for the performance of the rollers, since a CN x -to-steel contact is retained during the entire rolling contact fatigue test.

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