Effect of substrate concave pattern on splat formation of yttria-stabilized zirconia in atmospheric plasma spraying

Kentaro Shinoda, Mehdi Raessi, Javad Mostaghimi, Toyonobu Yoshida, Hideyuki Murakami

Research output: Contribution to journalReview article

11 Citations (Scopus)

Abstract

Splat morphology of yttria-stabilized zirconia (YSZ) on a microconcave-patterned substrate was investigated by both numerical and experimental approaches under a dc-rf hybrid-plasma spray condition. The spreading behavior of molten droplets on a microdimple pattern was numerically simulated in a three-dimensional form. For comparison, impact of a YSZ droplet onto a microdimple pattern of a quartz glass substrate was studied in situ utilizing thermal emissions from the droplet. Concave aspects of a substrate surface play an important role in fingering/splashing of a spreading droplet as well as convex patterns. The main mechanism that causes splashing is likely due to the slipping of a spreading droplet at the edge of concave patterns. The viscosity decrease of the spreading droplet enhances the droplet splash.

Original languageEnglish
Pages (from-to)609-618
Number of pages10
JournalJournal of Thermal Spray Technology
Volume18
Issue number4
DOIs
Publication statusPublished - 2009 Dec 1
Externally publishedYes

Keywords

  • Coating-substrate interaction
  • Coatings for gas turbine components
  • Diagnostics and control
  • Influence of process parameters
  • Roughness effects
  • Splats cooling
  • Spray deposition

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Materials Chemistry

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