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
6 k( n' d$ |; @1 }! ]! |% V1 Materials Center Leoben, Department of Physical Metallurgy and Materials
Testing, University of Leoben
Franz-Josef-Strasse 18, A-8700 Leoben, Austria
4 ]9 ^+ P/ Z" ^9 V  `# a/ P2 R2 Department of Physical Metallurgy and Materials Testing, University of Leoben
! w# R( e, C  Z* i4 T5 E, OFranz-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
" }( W+ s9 [! Y, B& v' Icorrosion of tools. In the last two decades, tremendous advances have been achieved
) w) h' W8 M+ B1 ?$ z6 A8 a; fin the development of deposition and application technology of hard coatings. The
& ~! B6 e: q, x; f7 jmethods to be applied to optimize coating properties are known from materials
# b. A3 S+ ~' @8 ]: J1 Uscience, 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
this paper is to show the interrelationships between microstructural parameters
7 ~: l3 W( R) W6 T2 v- M8 olike grain size or microstress and mechanical coating properties and their thermal
  y7 b- z/ Y  T9 o0 fstability. This is demonstrated using conventional coating systems like TiN and
CrN as well as nanocomposite coating systems like TiN–TiB2 and TiC–TiB2.