I have attempted to meet request on lightweight functional materials with low friction coefficient and high wear resistance reported by various areas of industry. For this purpose I attempted to combine good tribological properties of MoS2 (Ti,W) coatings base and modified and refined silumin. In addition, under MoS2 (Ti,W) coating the Cr interlayer was deposited having the task to increase the adhesion of the coating to the substrate. In such a composite tribological tests were the major studies. Additionally, for the characterization of deposited coatings the following studies were conducted: qualitative analysis of the phase composition of X-ray diffraction (XRD), linear analysis of the distribution of selected elements (EDS), nano-hardness and Young modulus were measured.
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Purpose: The paper presents results of the selected mechanical and tribological properties of the low friction MoS2(Ti,W) coatings with a Ti interlayer deposited by magnetron sputtering method on silumin. Design/methodology/approach: MoS2(Ti,W) coating was investigated by basic tribological tests and it was characterized by linear distribution analysis of selected chemical elements (EDS), nanohardness and Young’s modulus. Findings: It was established that the total thickness of the produced MoS2(Ti, W) coatings with the Ti layer equaled about 2.5 µm. The MoS2(Ti,W) layers produced on a substrate significantly increase its functional properties, by significantly lowering the friction coefficient and wear, thus improving its mechanical properties (hardness and Young’s modulus). Practical implications: Silumins used as a substrates should be previously refined before coating process to reduce the porosity of the material and to obtain maximum adherence of MoS2(Ti,W) layer. Originality/value: The increasingly accurate knowledge on the subject of the relations between the composition, processing, microstructure characteristics and properties has led to the improvement of aluminium properties. However, there is the need to improve of the tribological properties of these alloys what authors obtained.
Zbadano charakterystyki tribologiczne ślizgowego węzła tarcia typu kula–tarcza pracującego w powietrzu w warunkach tarcia technicznie suchego oraz próżni. Elementami testowymi były tarcze wykonane ze stali 100Cr6 bez powłoki i z naniesionymi powłokami: przeciwzużyciową CrN i niskotarciową MoS2 oraz kulki łożyskowe ze stali 100Cr6 jako przeciwpróbki. Właściwości tribologiczne badanego węzła tarcia oceniano na podstawie przebiegu zmian współczynnika tarcia, intensywności zużywania liniowego, średnicy wytarcia kulki oraz wyglądu wytartych powierzchni. Wykazano istotny wpływ próżni na przebieg tarcia i zużycia badanych skojarzeń ciernych.
EN
Tribological characteristics of coatings were investigated using a ball-on-disc tribosystem without lubrication in the presence of air and in a vacuum. The tests were performed employing friction pairs consisting of 100Cr6 bearing steel balls and a disc (uncoated or CrN and MoS2 coated). The evaluation of tribological properties of the investigated ball-on-disc tribosystem have been done on the basis of friction coefficient, linear wear intensity, wear scar diameters on balls, and microscopy observation of the worn surfaces. The results indicate that the vacuum significantly influences the friction and wear behaviour of investigated friction pairs.
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