Microstructural evaluation of suspension thermally sprayed WC-Co nanocomposite coatings

R. Ahmed, N. H. Faisal, O. Ali, Nayef M. Al-Anazi, S. Al-Mutairi, S. Mamour, E. K. Polychroniadis, M. F A Goosen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Microstructural and sliding wear evaluations of nanostructured coatings deposited by Suspension High Velocity Oxy-Fuel (S-HVOF) spraying were conducted in as-sprayed and HIPed (Hot Isostatically Pressed) conditions. S-HVOF coatings were nanostructured via ball milling of the WC-12Co start powder, and deposited via an aqueous based suspension using modified HVOF (TopGun) spraying. Microstructural evaluations of these hardmetal coatings included TEM (Transmission Electron Microscopy), X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Sliding wear tests were conducted using a ball-on-flat test rig. Results indicated that nanostructured features inherited from the start powder in S-HVOF spraying were retained in the resulting coatings. The decarburisation of WC due to a higher surface area to volume ratio was also observed in the S-HVOF coatings. Nanostructured and amorphous phases caused by the highcooling rates during thermal spraying crystallized into complex eta-phases after the HIPing treatment. Sliding wear performance indicated that the coating wear was lower for the HIPed coatings.

Original languageEnglish
Title of host publication2nd International Multidisciplinary Microscopy and Microanalysis Congress
PublisherSpringer International Publishing
Pages31-38
Number of pages8
Volume164
ISBN (Print)9783319169187
DOIs
Publication statusPublished - 2015
Event2nd International Multidisciplinary Microscopy and Microanalysis Congress and Exhibition - Oludeniz, Turkey
Duration: 16 Oct 201419 Oct 2014

Publication series

NameSpringer Proceedings in Physics
PublisherSpringer International Publishing
Volume164
ISSN (Print)0930-8989

Conference

Conference2nd International Multidisciplinary Microscopy and Microanalysis Congress and Exhibition
Abbreviated titleINTERM 2014
CountryTurkey
CityOludeniz
Period16/10/1419/10/14

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Cite this

    Ahmed, R., Faisal, N. H., Ali, O., Al-Anazi, N. M., Al-Mutairi, S., Mamour, S., Polychroniadis, E. K., & Goosen, M. F. A. (2015). Microstructural evaluation of suspension thermally sprayed WC-Co nanocomposite coatings. In 2nd International Multidisciplinary Microscopy and Microanalysis Congress (Vol. 164, pp. 31-38). (Springer Proceedings in Physics; Vol. 164). Springer International Publishing. https://doi.org/10.1007/978-3-319-16919-4_5