Paper Title:
Properties of Sputtered NiCrAlY Used for Protective Gun Tube Coatings
  Abstract

NiCrAlY coatings were deposited on CrNi3MoVA steel substrates by means of magnetron sputtering. The coatings were characterized in terms of their microstructure, hardness, friction coefficient, high-temperature oxidation resistance. Micro-indentation and tribometer testers were employed to measure the mechanical properties of NiCrAlY coatings and CrNi3MoVA steel. The results showed that the hardness of the coatings ranged from 5.7 to 5.9 GPa, with a higher value than that of CrNi3MoVA steel(4.1-4.3 GPa). The coefficient of steady-state friction of the coatings against 45-carbon-steel balls ranged from 0.35 to 0.40, with a lower value than that of CrNi3MoVA steel(0.63-0.68). The isothermal oxidation behavior at 850°C of the coatings were studied in comparison with CrNi3MoVA steel substrates. The results indicated that NiCrAlY coatings substantially increase the high-temperature oxidation resistance of CrNi3MoVA steel and the oxidation process was retarded mainly by the presence of outer complex oxide scales and a continuous Al2O3 inner layer on the coating.

  Info
Periodical
Edited by
Yafang Han, Fusheng Pan, Jianmao Tang, Chungen Zhou
Pages
613-617
DOI
10.4028/www.scientific.net/MSF.686.613
Citation
J. Zhang, C. Guo, G. Zhang, C. R. Wang, S. M. Hao, "Properties of Sputtered NiCrAlY Used for Protective Gun Tube Coatings", Materials Science Forum, Vol. 686, pp. 613-617, 2011
Online since
June 2011
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$32.00
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