Abstract
The splat morphology of yttria-stabilized zirconia (YSZ) droplets deposited by dc-rf hybrid plasma spraying (HYPS) was studied. Two types of YSZ powder were used, namely fused and crushed powder (FC) and hollow spherical powder (HOSP). The three-dimensional shape of more than 600 disk-shaped splats on preheated substrates was evaluated using a laser-scanning microscope to determine the splat diameter, thickness, and their dimensionless forms. The HOSP showed a higher degree of flattening than the FC. Both the FC with a powder size distribution of 45-75 μm and the HOSP of 30-120 μm can be used as spray materials in the HYPS to achieve a coating design based on fully molten particles. The effect of the substrate temperature on the splat morphology was similar to that of atmospheric dc plasma spraying; however, the transition from a splashed shape to a disk shape gradually occurred at higher substrate temperatures.
| Original language | English |
|---|---|
| Pages (from-to) | 602-610 |
| Number of pages | 9 |
| Journal | Journal of Thermal Spray Technology |
| Volume | 19 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2010 Mar 1 |
| Externally published | Yes |
Keywords
- Diagnostics and control
- Preheating of substrate
- RF induction plasma spraying
- TBC topcoats
ASJC Scopus subject areas
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Materials Chemistry