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Substrate influence on the properties of thermally sprayed WC–CrC–Ni cermet coatings

V. A. ŞERBAN1, I. D. UŢU1,* , G. MĂRGINEAN2

Affiliation

  1. University “Politehnica” Timisoara, Mechanical Engineering Faculty, Bv. Mihai Viteazu 1, 300222, Timisoara, Romania
  2. University of Applied Sciences Gelsenkirchen, Neidenburger Straße 43, D 45897 Gelsenkirchen ,Germany

Abstract

High velocity oxygen fuel (HVOF) technology needs in the last time to offer increased throughputs and feed powder utilization efficiencies. Heat input into the substrate component depends mainly on the spraying parameters and has to be rapidly built-up from the substrate material in order to achieve good mechanical, physical and chemical properties of the applied coatings. Therefore one should consider the influence of the thermal conductivity of the substrate on the properties of the sprayed coatings. In the frame of this research work, a WC-20CrC-7Ni feedstock powder was deposited using HVOF spraying method onto aluminum, brass and stainless steel. The importance of the substrate thermal conductivity was confirmed by the microstructural changes induced in the coatings during the deposition process. The coating properties such as microstructure, hardness and phase composition have been investigated by scanning electron microscopy (SEM), microhardness tests respectively X-ray diffraction (XRD). The corrosion behavior of the coatings was evaluated by potentiodynamic measurements using a three electrode open cell and the sliding wear resistance was determined using the pin-on-disk method. The obtained results demonstrate the importance of decarburation degree of the WC-phase on the corrosion and wear resistance of the coating..

Keywords

Corrosion resistance, HVOF spraying, Cermet coatings, Sliding wear behavior.

Submitted at: Jan. 26, 2015
Accepted at: Sept. 9, 2015

Citation

V. A. ŞERBAN, I. D. UŢU, G. MĂRGINEAN, Substrate influence on the properties of thermally sprayed WC–CrC–Ni cermet coatings, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 9-10, pp. 1425-1430 (2015)