Journal of Thermal Spray Technology

, Volume 17, Issue 5–6, pp 623–630 | Cite as

In Situ Visualization of Impacting Phenomena of Plasma-Sprayed Zirconia: From Single Splat to Coating Formation

  • Kentaro Shinoda
  • Hideyuki Murakami
  • Seiji Kuroda
  • Kohsei Takehara
  • Sachio Oki
Peer Reviewed


The authors have developed an in situ monitoring system for particle impacts under atmospheric dc plasma spraying conditions. This system utilized a high-speed video camera coupled with a long-distance microscope, and was capable of capturing the particle-impinging phenomena at one million frames per second. To understand the coating formation mechanism, two approaches were attempted, i.e., observation of the single splat formation and the subsequent coating formation. In the former case, the deformation and cooling processes of yttria-stabilized zirconia (YSZ) droplets impinging on substrates were successfully captured. In the latter case, multiple-droplet-impacting phenomena were observed as an ensemble treatment. Representing the coating process, the tower formation (0-dimensional) and bead formation (1-dimensional) were observed under typical plasma spray conditions for thermal barrier coatings using a triggering system coupled with the motion of a robot. The obtained images clearly showed the coating formation resulting from the integration of single splats.


coatings for gas turbine components diagnostics and control influence of spray parameters TBC topcoats 



We thank Prof. Takehar-Goji Etoh (Kinki University) for his useful discussions. We also thank Mr. Masayuki Komatsu and Mr. Nobukazu Kakeya (NIMS) for help with the experiments.


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Copyright information

© ASM International 2008

Authors and Affiliations

  • Kentaro Shinoda
    • 1
  • Hideyuki Murakami
    • 1
  • Seiji Kuroda
    • 1
  • Kohsei Takehara
    • 2
  • Sachio Oki
    • 2
  1. 1.Coating Materials Group, Composites and Coatings CenterNational Institute for Materials Science (NIMS)TsukubaJapan
  2. 2.School of Science and EngineeringKinki UniversityHigashi OsakaJapan

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