Erosion performance of HVOF-Sprayed Cr 3C 2-NiCr coatings

Gang Chang Ji, Chang Jiu Li, Yu Yue Wang, Wen Ya Li

Research output: Contribution to journalReview articlepeer-review

47 Scopus citations

Abstract

Cr 3C 2-NiCr coatings were deposited by high-velocity oxygen fuel (HVOF) spraying process under spray conditions of different flows of oxygen and propane gases, and spray distances. The orthogonal regression experimental design method was used for systematic investigation of the influence of spray parameters on the erosion performance of Cr 3C 2-NiCr coatings. Erosion tests were performed at different jet angles of abrasive particles. The erosion mechanism of Cr 3C 2-NiCr coatings was examined through the surface morphology and cross-sectional microstructure of the eroded coatings. The correlations of the carbide particle size and carbide content with the erosion rate were examined. It was found that the erosion occurred dominantly by spalling of splats from the lamellar interfaces. The spalling resulted from the propagation of cracks parallel to the interfaces between the lamellae exposed to the surface and underlying coating. The carbide particle size and content in the coating influenced significantly the erosion performance of Cr 3C 2-NiCr coatings.

Original languageEnglish
Pages (from-to)557-565
Number of pages9
JournalJournal of Thermal Spray Technology
Volume16
Issue number4
DOIs
StatePublished - Dec 2007

Keywords

  • Cr C -NiCr coatings
  • Erosion mechanisms
  • Erosion performance
  • High-velocity oxygen fuel (HVOF)

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