Cathodic arc plasma deposition of nano-multilayered Zr-O/Al-O thin films

Sun Kyu Kim, Vinh Van Le, R. L. Boxman, V. N. Zhitomirsky, Jeong Yong Lee

Research output: Contribution to journalArticlepeer-review

Abstract

Thin films of Zr-O/Al-O were deposited on SKD 11 tool steel substrate using Zr and Al cathodes in a cathodic arc plasma deposition system. The substrates were mounted on a rotating holder which alternatively exposed them to plasma from the two cathodes. The influence of the Zr and Al cathode arc currents and the substrate bias on the mechanical and the structural properties of the films were investigated. Films with a nano-layered structure of alternating Al-rich and Zr-rich layers were obtained. The Zr layers contained nano-crystallites of (101) oriented t-ZrO structure. Crystallites with α-Al2O3 structure were observed only when the substrate was negatively biased in the 100-150 V range. The hardness of the film decreased with the increase of Zr cathode current from 60 to 80 A, increased when the Al cathode current increased from 25 to 30 A, and decreased when the Al cathode current increased from 30 to 35 A. The hardness of the film increased with the increase of bias voltage up to - 150 V and then decreased with further increase of the negative bias. The film structure was elucidated by HRTEM microscopy. Good correlation between the residual stress and the hardness enhancement of the films was observed.

Original languageEnglish
Pages (from-to)1697-1701
Number of pages5
JournalSurface and Coatings Technology
Volume204
Issue number11
DOIs
StatePublished - 25 Feb 2010

Keywords

  • Alumina
  • Cathodic arc plasma deposition
  • Nano-layered films
  • Zirconia

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