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Characterization of atmospheric plasma spray NiCr–Cr2O3–Ag–CaF2/BaF2coatings

Authors
Journal
Surface and Coatings Technology
0257-8972
Publisher
Elsevier
Publication Date
Volume
195
Issue
1
Identifiers
DOI: 10.1016/j.surfcoat.2004.11.041
Keywords
  • Atmospheric Plasma Spraying
  • Nicr–Cr2O3–Ag–Baf2/Caf2Blended Feedstock
  • Coating Microstructure

Abstract

Abstract A blended NiCr–Cr 2O 3–Ag–CaF 2/BaF 2 feedstock was sprayed using an atmospheric plasma spray process. Physical and thermophysical properties of each constituent phase are quite different and resulting interactions of each constituent with the plasma jet can be expected to be different. Thus, attempts to change the plasma jet characteristics by changing the hydrogen gas flow rate in view of the thermophysical properties of the plasma jet were tried. Phase compositions and microstructures were evaluated as a function at hydrogen gas flow rate. The effects of phase composition and microstructure on the Vickers microhardness and bond strength were also evaluated. For empirically tracing each constituent particle trajectory, spot spraying bead was produced. Finally, particle temperature and velocity as a function of the hydrogen gas flow rate was measured using alumina–titania particle instead of the blended feedstock.

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