Authors: Tillmann, Wolfgang
Feher, Alexander
Stangier, Dominic
Title: Impact of tungsten incorporation on the tribomechanical behavior of AlCrWxSiN films at room and elevated temperature
Language (ISO): en
Abstract: AlCrWxSiN thin films (0 ≤ x ≤ 17.1 at.%) were synthesized by means of a hybrid magnetron sputtering process, merging direct current (DC) as well as tungsten high power impulse magnetron sputtering (HiPIMS) supplies. The influences of increasing the tungsten contents on the structural as well as the friction and wear behavior at room and high temperatures (500 °C) were elaborated. As a reference, a W61.4N38.6 system served to analyze synergetic effects on the oxidation behavior. Increased tungsten contents in AlCrWxSiN resulted in more distinctive (200)-, (202)-, and (311)- crystal orientations. A W/Cr ratio of ~1 could be correlated with a denser film growth, the highest hardness (24.3 ± 0.7 GPa), and a significantly decreased wear coefficient (<0.3 × 10−5 mm3/Nm). Tribological tests performed at room temperature revealed that the coefficient of friction decreased with higher tungsten contents to µ~0.35. In contrast, at elevated temperatures, the coefficient of friction increased with higher W concentrations due to spotty oxidations in the wear track, which resulted in a locally increased surface roughness. Finally, a phase transformation of the WN film to m-WO3 did not contribute to a friction reduction at 500 °C.
Subject Headings: Chromium-based nitride
Tungsten nitride
Reactive magnetron sputtering
Hybrid process
High temperature tribology
Subject Headings (RSWK): Nitride
Issue Date: 2021-08-27
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Appears in Collections:Lehrstuhl für Werkstofftechnologie

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