In Situ Visualization of Impacting Phenomena of Plasma-Sprayed Zirconia: From Single Splat to Coating Formation
- 242 Downloads
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.
Keywordscoatings 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.
- 2.F. Gitzhofer, M. Boulos, J. Heberlein, R. Henne, T. Ishigaki, T. Yoshida, Integrated Fabrication Processes for Solid-Oxide Fuel Cells Using Thermal Plasma Spray Technology, MRS Bull., 2000, 25 (7), p 38-42Google Scholar
- 8.A. Vardelle, C. Moreau, P. Fauchais, The Dynamics of Deposit Formation in Thermal-Spray Processes, MRS Bull. 2000, 25 (7), p 32-37Google Scholar
- 9.T.G. Etoh, D. Poggemann, G. Kreider, H. Mutoh, A.J.P. Theuwissen, A. Ruckelshausen, Y. Kondo, H. Maruno, K. Takubo, H. Soya, K. Takehara, T. Okinaka, Y. Takano, An Image Sensor which Captures 100 Consecutive Frames at 1 000 000 Frames/s, IEEE Trans. Electron Dev., 2003, 50 (1), p 144-151CrossRefADSGoogle Scholar
- 11.K. Shinoda, H. Murakami, S. Kuroda, S. Oki, K. Takehara, and T.G. Etoh, High-Speed Thermal Imaging of Yttria-Stabilized Zirconia Droplet Impinging on Substrate in Plasma Spraying, Appl. Phys. Lett., 2007, 90(19), Art. No. 194103 (3 pp)Google Scholar
- 12.K. Shinoda, H. Murakami, S. Kuroda, S. Oki, K. Takehara, and T.G. Etoh, High-Speed Thermal Imaging of Yttria-Stabilized Zirconia Droplets Impinging on a Substrate in Plasma Spraying, Proceedings of the 18th International Symposium on Plasma Chemistry, K. Tachibana, Ed., August 26-31 2007 (Kyoto), International Plasma Chemistry Society, 2007, Art. No. 28C-a3 (4 pp)Google Scholar
- 14.K. Shinoda, T. Koseki, and T. Yoshida, Influence of Impact Parameters of Zirconia Droplets on Splat Formation and Morphology in Plasma Spraying, J. Appl. Phys., 2006, 100(7), Art. No. 074903 (6 pp)Google Scholar
- 18.R. Rioboo, C. Tropea, M. Marengo, Outcomes from a Drop Impact on Solid Surfaces, At. Sprays, 2001, 11, p 155-165Google Scholar
- 20.L. Xu, L. Barcos, and S.R. Nagel, Splashing of Liquids: Interplay of Surface Roughness with Surrounding Gas, Phys. Rev. E, 2007, 76(6), Art. No. 066311 (5 pp)Google Scholar
- 21.L. Xu, Liquid Drop Splashing on Smooth, Rough, and Textured Surfaces, Phys. Rev. E, 2007, 75, Art. No. 056316 (8 pp)Google Scholar