TRIBOLOGICAL PROPERTIES OF CrNmod COATINGS ON SMOOTH AND TEXTURED SURFACES

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Abstract
This study presents the results of applying a CrNmod coating to 42CrMo4 steel surfaces with and without spherical surface texturing. The CrNmod thin-film ceramic coating, deposited by a physical vapour deposition (PVD) process, is characterised by excellent wear resistance. As an additional surface engineering modification, spherical dimples were introduced prior to the PVD coating process. Appropriately designed surface textures, in terms of geometry and distribution, can enhance the tribological performance of sliding pairs. The primary objective of this study was to investigate the influence of the CrNmod coating and surface texturing on friction force. Surface topography and selected surface layer properties were characterised before tribological testing. The tribological performance of the specimens was evaluated using a T-11 tribometer operating in a ball-on-disc configuration. To achieve conformal contact, the ball counter-specimen was modified by precision grinding. All tribological tests were performed under lubrication with L-AN 46 mineral oil. The experimental results demonstrated that the application of the CrNmod coating significantly reduced friction compared with the uncoated steel surface. A further reduction in friction force was achieved when the coated surface was additionally modified with spherical surface texturing, indicating a synergistic effect of the combined surface engineering treatments on tribological performance.

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