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
4 [% g: U% j( \3 [1 Materials Center Leoben, Department of Physical Metallurgy and Materials
, u" k1 s0 X+ s3 MTesting, University of Leoben
4 d, j( g9 G* ^" ]Franz-Josef-Strasse 18, A-8700 Leoben, Austria
2 Department of Physical Metallurgy and Materials Testing, University of Leoben
! x7 z' ]  N1 u$ D) r: PFranz-Josef-Strasse 18, A-8700 Leoben, Austria
/ j& V) H+ g% `2 |( q1 c2 _Abstract. Hard coatings deposited by Physical Vapor Deposition (PVD) based
2 k& h+ r6 {, g, lon 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
0 h. C& M( [+ f" \+ {; \in the development of deposition and application technology of hard coatings. The
3 H1 J$ N( q& F$ R. Imethods to be applied to optimize coating properties are known from materials
3 {+ E9 D. c1 x0 B  i6 K% Kscience, however, only in the last few years significant attempts have been made
to use them for designing coatings showing the properties required. The aim of
" q6 K1 T9 b  U% M7 U- tthis paper is to show the interrelationships between microstructural parameters
$ i) y8 F0 {" Z1 `) q8 plike grain size or microstress and mechanical coating properties and their thermal
9 ]' {1 I, h( t; ^8 D2 Xstability. This is demonstrated using conventional coating systems like TiN and
/ W, T' I0 T7 F  QCrN as well as nanocomposite coating systems like TiN–TiB2 and TiC–TiB2.