Optimization of the Si3N4 coating formation through plasma spraying on Inconel 738

Mojtaba Najafizadeh, Mehran Ghasempour-Mouziraji, Sajad Shahrani, Mansoor Bozorg, Constantinos Goulas, Morteza Hosseinzadeh, Pasquale Cavaliere*, Angelo Perrone, Serena Perrone

*Corresponding author for this work

Research output: Contribution to journalComment/Letter to the editorAcademicpeer-review

1 Citation (Scopus)
5 Downloads (Pure)


In the present study, the deposition of silicon nitride (Si3N4) coating on Inconel 738 through plasma spray has been investigated. For producing the Si3N4 coating, different times (6, 8 and 10 s), different distances of the plasma spray torch from the substrate (30, 35 and 40 mm) and different currents for plasma spraying (3000, 3250 and 3500 A) were employed. For the characterisation of the coatings, SEM (thickness), XRD, micro-hardness and adhesion of the samples were measured. The coatings’ surface morphology was investigated through SEM. Based on the experimental results, by using a spraying time of 10 s, a distance of the torch of 40 mm and a current of 3500 A, high microhardness and adhesion of the coatings are obtained. On the other hand, the thickness of the coating increased by reducing the distance and increasing spray time and current.

Original languageEnglish
Pages (from-to)338-351
Number of pages14
JournalTribology - Materials, Surfaces and Interfaces
Issue number4
Early online date16 Aug 2023
Publication statusPublished - 2 Oct 2023


  • coatings
  • hardness
  • Inconel 738
  • multi-objective optimisation
  • Plasma spray coating
  • response surface methodology
  • SiN coating
  • superalloys
  • 2024 OA procedure


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