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

Ahmed, R.; Faisal, Nadimul Haque; 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.

Authors

R. Ahmed

Nadimul Haque 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



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.

Journal Article Type Article
Publication Date Feb 28, 2015
Journal Journal of thermal spray technology
Print ISSN 1059-9630
Electronic ISSN 1544-1016
Publisher Springer (part of Springer Nature)
Peer Reviewed Peer Reviewed
Volume 24
Issue 3
Pages 357-377
Institution 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
DOI https://doi.org/10.1007/s11666-014-0174-2
Keywords Nanoindentation; Nanostructured coating; Suspension spraying; Tribology; WCCo coating; Wear

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