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ICMCTF - 2015
Helmut Riedl (H. Riedl)
Talk
"Mechanical and tribological properties of arc evaporated Ti1-xAlxN/Mo1-x-ySixBy multilayer coatings"
H. Riedl (a), J. Kalas (b), P. Polcik (c) and P. H. Mayrhofer (a,d)

(a) Christian Doppler Laboratory for Application Oriented Coating Development at the Institute of Materials Science and Technology, Vienna University of Technology, A-1040 Vienna, Austria
(b) Oerlikon Balzers Coating AG, FL-9496 Balzers, Liechtenstein
(c) Plansee Composite Materials GmbH, D-86983 Lechbruck am See, Germany
(d) Institute of Materials Science and Technology, Vienna University of Technology, A-1040 Vienna, Austria
Previous studies in the field of PVD processed low friction coatings pointed out the possibilities of architectural designs, such as multilayer or nanocomposite coatings (e.g. TiAlN/VN, TiC-C), to combine particular properties and hence gain superior tribological performance. To follow this concept we investigated the mechanical and tribological properties of arc evaporated Ti1-xAlxN and Mo1-x-ySixBy multilayer coatings. The combination of Ti1-xAlxN —as a well-established thin film showing high hardness and thermal stability—and Mo1-x-ySixBy—as a Mo based coating system with excellent thermal stability and the ability to form lubricious Magnéli phase oxides such as MonO3n-1—aims for excellent wear behavior at elevated temperatures. A chemical variation of the Mo1-x-ySixBy layers allows designing a high thermal stability and high oxidation resistance by forming stable borosilica scales and the necessary oxidation to form MonO3n-1 Magnéli phase oxides.
Further modifications of the coating architecture are obtained by varying the bilayer period between 20 and 120 nm. The individual coating characteristics, such as hardness, wear rate, coefficient of friction, and thermal stability are correlated with detailed transmission electron microscopy studies.
 


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