Journal of Thermal Spray Technology

, Volume 7, Issue 2, pp 213–218

Comparative study of WC-cermet coatings sprayed via the HVOF and the HVAF Process

  • L. Jacobs
  • M. M. Hyland
  • M. De Bonte
Reviewed Papers

DOI: 10.1361/105996398770350954

Cite this article as:
Jacobs, L., Hyland, M.M. & De Bonte, M. J Therm Spray Tech (1998) 7: 213. doi:10.1361/105996398770350954

Abstract

The high velocity air fuel (HVAF) system is a high-velocity combustion process that uses compressed air and kerosene for combustion. Two WC-cermet powders were sprayed by the HVAF and the high-velocity oxyfuel (HVOF) processes, using an AeroSpray gun (Browning Thermal Systems Inc., Enfield, New Hampshire) and a CDS-100 gun (Sulzer Plasma Technik, Wohlen, Switzerland) respectively. Several techniques, including x-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy, were used to characterize the microstructures and phase distribution of the powders and coatings. In addition, mechanical properties such as hardness and wear resistance (pin-on-disk) were investigated. A substantial amount of W2C was found in the HVOF coatings, as well as a high concentration of tungsten in the binder phase, indicating that oxidation and dissolution processes change the composition and microstructure from powder to coating during spraying. This was in contrast to the HVAF coatings in which composition and microstructure were unchanged from that of the powder. Additionally, the wear resistance of the HVAF coatings was superior to that of the HVOF coatings.

Keywords

cemented carbides decarburization HVAF HVOF thermal spray 

Copyright information

© ASM International 1998

Authors and Affiliations

  • L. Jacobs
    • 1
  • M. M. Hyland
    • 1
  • M. De Bonte
    • 2
  1. 1.Department of Chemical and Materials EngineeringThe University of AucklandAucklandNew Zealand
  2. 2.Department of Metallurgy and Materials EngineeringKatholieke Universiteit LeuvenHeverleeBelgium

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