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 language | English |
|---|---|
| Pages (from-to) | 609-618 |
| Number of pages | 10 |
| Journal | Journal of Thermal Spray Technology |
| Volume | 18 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2009 Dec 1 |
| Externally published | Yes |
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