Hard and superhard Zr-Ni-N nanocomposite films

J. Musil, P. Karvánková, J. Kasl

Research output: Contribution to journalArticle

103 Citations (Scopus)

Abstract

This article reports on the relationship between the structure and mechanical properties of Zr-Ni-N nanocomposite films prepared by d.c.-reactive magnetron sputtering of a ZrNi (90/10 at.%) alloyed target in a mixture of Ar and N2 onto steel substrates using a planar round unbalanced magnetron with a diameter of 100 mm. The Zr-Ni-N nanocomposite films represent a new material of the type nc-MeN/metal composed of a hard nc-ZrN phase and a soft Ni phase, where nc- denotes the nanocrystalline phase of zirconium nitride. It was found that (i) there is a strong correlation between the structure of the film, the content of Ni in the nanocomposite and the film properties; (ii) Zr-Ni-N films can form superhard films with a high hardness up to 57 GPa; and (iii) Zr-Ni-N films with the same hardness (H > 40 GPa) can exhibit different structures and strongly differ in the size of nc-ZrNx grains of which they are composed. Therefore, the superhard coatings with a hardness of H > 40 GPa are characterized either by the strong reflection from large (20-50 nm) ZrNx grains with a preferential orientation or by many weak reflections from small, approximately 10 nm, ZrNx grains. General relationships between the microhardness H, the reduced Young's modulus E* = E/(1 - v2), and the elastic recovery We, determined from loading/unloading curves measured using a Fisherscope microhardness tester are given; here E and v are the Young's modulus and the Poisson's ratio, respectively. The ratio H3/E*2, which represents the resistance of the material to plastic deformation, is also given.

Original languageEnglish
Pages (from-to)101-109
Number of pages9
JournalSurface and Coatings Technology
Volume139
Issue number1
DOIs
Publication statusPublished - 1 May 2001

Keywords

  • Magnetron sputtering
  • Mechanical properties
  • Ne-ZrN/Ni Nanocomposite films
  • Structure

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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