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Evaluation of duplex (Zr,Al)CN coatings with improved tribological performance

C. COTRUT1, A. VLADESCU2, V. BRAIC2, M. BRAIC2,* , M. BALACEANU2, F. MICULESCU1

Affiliation

  1. University Politehnica of Bucharest, 313 Sp.Independentei, Bucharest, Romania
  2. National Institute for Optoelectronics, 409 Atomistilor, Magurele, Romania

Abstract

Duplex coatings consisting of nitrided HSS steel substrates and (Zr,Al)CN layers were produced. Plasma nitriding of the steel was carried out for 3 h in an atmosphere of N2 (30%) and H2 (70%) gases, at 480°C. The (Zr,Al)CN coatings were deposited by cathodic arc technique on the nitrided steel surfaces. For the nitrided layer, a thickness and surface microhardness of about 60 µm and 1580HV0.02, respectively, were measured. The (Zr,Al)CN coatings, with a highly over stoichiometric composition ((C+N)/(Zr+Al) ~ 2) and single solid solution nanostructure, had hardness of ~ 36 GPa and a thickness of ~ 4.8 µm. The duplex coatings produced were found to exhibit superior friction and wear performance when compared to plasma nitrided substrates..

Keywords

Duplex treatment, (Zr,Al)CN thin films, Mechanical properties, Wear resistance.

Submitted at: June 7, 2012
Accepted at: July 19, 2012

Citation

C. COTRUT, A. VLADESCU, V. BRAIC, M. BRAIC, M. BALACEANU, F. MICULESCU, Evaluation of duplex (Zr,Al)CN coatings with improved tribological performance, Journal of Optoelectronics and Advanced Materials Vol. 14, Iss. 7-8, pp. 646-652 (2012)