Structure property relationship of suspension thermally sprayed WC-Co nanocomposite coatings

R. Ahmed, N. H. Faisal, Nayef M. Al-Anazi, S. Al-Mutairi, F. L. Toma, L. M. Berger, A. Potthoff, E. K. Polychroniadis, M. Sall, D. Chaliampalias, M. F A Goosen

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Tribomechanical properties of nanostructured coatings deposited by suspension high velocity oxy-fuel (S-HVOF) and conventional HVOF (Jet Kote) spraying were evaluated. Nanostructured S-HVOF coatings were obtained via ball milling of the agglomerated and sintered WC-12Co feedstock powder, which were deposited via an aqueous-based suspension using modified HVOF (TopGun) process. Microstructural evaluations of these hardmetal coatings included transmission electron microscopy, x-ray diffraction, and scanning electron microscopy equipped with energy dispersive x-ray spectroscopy. The nanohardness and modulus of the coated specimens were investigated using a diamond Berkovich nanoindenter. Sliding wear tests were conducted using a ball-on-flat test rig. Results indicated that low porosity coatings with nanostructured features were obtained. High carbon loss was observed, but coatings showed a high hardness up to 1000 HV2.9N. S-HVOF coatings also showed improved sliding wear and friction behavior, which were attributed to nanosized particles reducing ball wear in three-body abrasion and support of metal matrix due to uniform distribution of nanoparticles in the coating microstructure.

Original languageEnglish
Pages (from-to)357-377
Number of pages28
JournalJournal of Thermal Spray Technology
Volume24
Issue number3
DOIs
Publication statusPublished - Feb 2015

Keywords

  • nanoindentation
  • nanostructured coating
  • suspension spraying
  • tribology
  • WC-Co coating
  • wear

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Chemistry
  • Surfaces, Coatings and Films

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