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

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

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.

Citation

AHMED, R., FAISAL, N.H., AL-ANAZI, N.M., AL-MUTAIRI, S., TOMA, F.-L., BERGER, L.-M., POTTHOFF, A., POLYCHRONIADIS, E.K., SALL, M., CHALIAMPALIAS, D. and GOOSEN, M.F.A. 2015. Structure property relationship of suspension thermally sprayed WC-Co nanocomposite coatings. Journal of thermal spray technology [online], 24(3), pages 357-377. Available from: https://doi.org/10.1007/s11666-014-0174-2

• Journal Article Type: Article
• Acceptance Date: Nov 12, 2014
• Online Publication Date: Nov 12, 2014
• Publication Date: Feb 28, 2015
• Deposit Date: Nov 10, 2015
• Publicly Available Date: Nov 13, 2015
• Journal: Journal of thermal spray technology
• Print ISSN: 1059-9630
• Electronic ISSN: 1544-1016
• Publisher: Springer
• Peer Reviewed: Peer Reviewed
• Volume: 24
• Issue: 3
• Pages: 357-377
• DOI: https://doi.org/10.1007/s11666-014-0174-2
• Keywords: Nanoindentation; Nanostructured coating; Suspension spraying; Tribology; WCCo coating; Wear
• Public URL: http://hdl.handle.net/10059/1340
• Contract Date: Nov 10, 2015