Fabrication of WC-based Metal Matrix Composite Coatings via Low-pressure Cold Spraying for Enhanced Surface Properties

  • Author / Creator
    Melendez, Natanael M
  • A low-cost, low-pressure cold spray unit was used to fabricate tungsten carbide
    (WC)-based metal matrix composite (MMC) coatings. A variety of coatings were
    fabricated and characterized. Scanning electron microscopy (SEM), coupled with
    image analysis, Vickers micro-hardness, and X-ray diffraction (XRD) were used
    to characterize the coatings. Image analysis was used to determine the WC
    content in the coatings and the mean free path between the reinforcing particles.
    The WC content in the coating increased as the WC content in the powder blend
    increased. As the WC content in the powder increased, the coating porosity
    decreased and the WC deposition efficiency increased. ASTM standard G65-2004
    dry abrasion testing was conducted on WC-Ni coatings to determine a
    relationship between hardness and wear resistance. A linear relationship was
    observed between the wear rate and hardness of the WC-Ni MMC coatings. The
    coating deemed optimal had a wear rate comparable to those of WC-Co coatings
    fabricated by high-velocity oxy-fuel (HVOF) and high-pressure cold spraying.

  • Subjects / Keywords
  • Graduation date
    Fall 2013
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.