Some Materials Science Aspects of PVD Hard Coatings

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1. Some Materials Science Aspects of PVD Hard Coatings

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Christian Mitterer1 and Paul H. Mayrhofer2
/ u6 M- T5 h+ x# ?0 ~# y1 Materials Center Leoben, Department of Physical Metallurgy and Materials
& D: R/ N, z$ @Testing, University of Leoben
+ S) D6 t4 h1 M; m. ]Franz-Josef-Strasse 18, A-8700 Leoben, Austria
2 Department of Physical Metallurgy and Materials Testing, University of Leoben
Franz-Josef-Strasse 18, A-8700 Leoben, Austria
Abstract. Hard coatings deposited by Physical Vapor Deposition (PVD) based
on the transition element nitrides are nowadays widely applied to reduce wear and
corrosion of tools. In the last two decades, tremendous advances have been achieved
: q" J' [  }, j4 |5 e& j' Rin the development of deposition and application technology of hard coatings. The
) u* Y- h( l. E" w; k/ Nmethods to be applied to optimize coating properties are known from materials
science, however, only in the last few years significant attempts have been made
! [, Y+ {- n6 e( j& t. \3 m3 ~to use them for designing coatings showing the properties required. The aim of
this paper is to show the interrelationships between microstructural parameters
* l, Y& P$ g' O3 [: K3 H2 Q6 Qlike grain size or microstress and mechanical coating properties and their thermal
stability. This is demonstrated using conventional coating systems like TiN and
CrN as well as nanocomposite coating systems like TiN–TiB2 and TiC–TiB2.