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

: Ahmed, Rehan R.; Faisal, N.H.; Al-Anazi, Nayef; Al-Mutairi, S.; Toma, Filofteia-Laura; Berger, Lutz-Michael; Potthoff, Annegret; Polychroniadis, E.K.; Sall, M.; Chaliampalias, D.; Goosen, Mattheus F.A.


Journal of thermal spray technology 24 (2015), No.3, pp.357-377
ISSN: 1059-9630
ISSN: 1544-1016
Journal Article
Fraunhofer IKTS ()
Fraunhofer IWS ()
nanoindentation; nanostructured coating; suspension spraying; WC-Co coating; tribology

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.