Authors: Kokalj, David
Debus, Jörg
Stangier, Dominic
Moldenhauer, Henning
Nikolov, Alexander
Wittig, Alexandra
Brümmer, Andreas
Tillmann, Wolfgang
Title: Controlling the structural, mechanical and frictional properties of MoSx coatings by high-power impulse magnetron sputtering
Language (ISO): en
Abstract: Tribology, as the science and technology of interacting surfaces, typically relies on liquid lubricants which reduce friction and wear. For environmentally friendly tribological purposes and applications requiring a liquid-free performance, solid lubricants, such as MoS2 coatings, play an essential role. It is crucial to understand the interplay between the parameters of the coating synthesis and the characteristics of the coating. The impact of the deposition parameters on the structural, mechanical and frictional properties of MoSx thin films, which are synthesized by high-power impulse magnetron sputtering, are studied. The morphology, topography and stoichiometry (2.02 < x < 2.22) of the films are controlled by, in particular, the bias-voltage and heating power applied during the sputtering process. In combination with a low pulse frequency the hardness and elastic stiffness of the MoSx films are enhanced up to 2 and 90 GPa, respectively. This enhancement is assigned to a shortening of the Mo-S bonding lengths and a strengthening in the interatomic coupling as well as to a formation of small-sized crystallites at the surface. The friction coefficient reduces to µ = 0.10 for films with an initial (100) orientation and the mean roughness of the MoSx films decreases below 15 nm by shortening the cathode pulses.
Subject Headings: Molybdenum disulfide
High-power impulse magnetron sputtering
Thin films
Inelastic light scattering
Subject Headings (RSWK): Molybdän
Dünne Schicht
Dynamische Lichtstreuung
Issue Date: 2020-08-03
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Appears in Collections:Lehrstuhl für Werkstofftechnologie

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