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Vilutis, Almontas
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article
Frictional behavior of wood-plastic composites against PVD-coated cemented carbide
Abstract
Wood-plastic composites (WPC) are becoming increasingly popular due to many benefits, including the abilityto use recycled raw materials that conserve natural resources and solve environmental problems. Since the tool and theworkpiece are in contact during machining, the optimization of friction processes requires significant attention. This workinvestigates the dry friction parameters of two different WPCs with a WC-Co hard alloy coated with PVD layers of differentcompositions. The tests with a tribometer were conducted using the rotating disc (WPC) - flat plate (WC-Co + PVD)scheme. The sliding distance, the normal force and the contact temperature were measured. The results of the regressionanalysis showed that the data obtained are best approximated by a complete second-degree polynomial model (adjustedcoefficient of determination R2 >0.99). The most important factors examined are the normal force F and the contacttemperature T. The coated cemented carbide tools had an average coating thickness of 1.61±0.13 m and an increase inroughness of 10.8%. Compared to WPC-B samples, the average volumetric wear was 4.6 times higher for WPC-A samples.Due to the lower thermal conductivity of PVD coatings, heat could not be dissipated effectively in the cemented carbidesubstrate. With all PVD coatings, the dynamic coefficient of friction of WPC-A was 48% lower than with the uncoatedblade. In contrast, the coefficient of friction of WPC-B with three different coatings was 14% higher than that of theuncoated blade. The change in roughness, coefficient of friction values, and wear rate of the PVD coatings, on the otherhand, was smaller with WPC-B. With both composites, the C1-coded coating was the best for overall friction and weareffects. Surfaces were also examined using SEM, as well as EDS analysis.