Journal
SURFACE & COATINGS TECHNOLOGY
Volume 200, Issue 5-6, Pages 1702-1708Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2005.08.088
Keywords
TiAlN/CrN; cathodic arc evaporation; mechanical properties
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Multilayered TiAlN/CrN as well as monolayered CrN and TiAlN coatings were synthesized by cathodic arc evaporation with plasma enhanced duct equipment, using Cr and Ti50Al50 alloy cathodes. Optical emission spectra including atomic and ionized Ti, atomic Al and Cr, excited and ionized nitrogen (N-2, N-2(+), and N-2(+)) revealed that excitation, ionization and charge transfer reactions of the Ti-Al-N and Cr-N plasma occurred during the multilayered TiAlN/CrN coating process. The preferred orientation was changed from (200) in CrN and TiAlN monolayered coatings to (111) plane in the multilayered TiAIN/CrN coatings. The multilayered TiAIN/CrN films had smaller crystallite size than the monolayered CrN and TiAlN films. The multilayered TiAIN/CrN coating with periodic thickness of 18 nm exhibited the highest H-3/E*(2) ratio value of 0.193 GPa, indicating the best resistance to plastic deformation, among the studied CrN, TiAlN and multilayered TiAlN/CrN coatings. The multilayered TiAIN/CrN coatings also showed the best adhesion strength during scratch tests. It has been found that the structural and mechanical properties of the films were correlated with the multiple cathode design and nanolayer thickness. (c) 2005 Elsevier B.V. All rights reserved.
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