Influence of Post-treatment on the Microstructural and Tribomechanical Properties of Suspension Thermally Sprayed WC–12 wt%Co Nanocomposite Coatings

Omar Ali, Rehan Ahmed, Nadimul Haque Faisal, Nayef M. Alanazi, L. M. Berger, A. Kaiser, F. L. Toma, E. K. Polychroniadis, M. Sall, Y. O. Elakwah, M. F. A. Goosen

Research output: Contribution to journalArticle

12 Citations (Scopus)
37 Downloads (Pure)

Abstract

The potential to improve the tribomechanical performance of HVOF-sprayed WC–12Co coatings was studied by using aqueous WC–12Co suspensions as feedstock. Both as-sprayed and hot-isostatic-pressed (HIPed) coatings were studied. Mathematical models of wear rate based on the structure property relationships, even for the conventionally sprayed WC–Co hardmetal coatings, are at best based on the semiempirical approach. This paper aims to develop these semiempirical mathematical models for suspension sprayed nanocomposite coatings in as-sprayed and heat-treated (HIPed) conditions. Microstructural evaluations 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 the HIPing post-treatment resulted in crystallization of amorphous coating phases and increase in elastic modulus and hardness. Influence of these changes in the wear mechanisms and wear rate is discussed. Results are also compared with conventionally sprayed high-velocity oxy-fuel hardmetal WC–Co coatings.

Original languageEnglish
Article number33
JournalTribology Letters
Volume65
Issue number2
Early online date19 Jan 2017
DOIs
Publication statusPublished - Jun 2017

Keywords

  • Hot isostatic pressuring (HIPing)
  • Microstructure
  • Nanostructured coating
  • Phase composition
  • Sliding wear
  • Suspension spraying
  • Tribology
  • WC–12Co coating
  • Wear mechanism

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Fingerprint Dive into the research topics of 'Influence of Post-treatment on the Microstructural and Tribomechanical Properties of Suspension Thermally Sprayed WC–12 wt%Co Nanocomposite Coatings'. Together they form a unique fingerprint.

  • Cite this

    Ali, O., Ahmed, R., Faisal, N. H., Alanazi, N. M., Berger, L. M., Kaiser, A., Toma, F. L., Polychroniadis, E. K., Sall, M., Elakwah, Y. O., & Goosen, M. F. A. (2017). Influence of Post-treatment on the Microstructural and Tribomechanical Properties of Suspension Thermally Sprayed WC–12 wt%Co Nanocomposite Coatings. Tribology Letters, 65(2), [33]. https://doi.org/10.1007/s11249-017-0815-y