| Title |
Solution concentration effect on mechanical injection and deposition of YSZ coatings using the solution precursor plasma spraying |
|
Authors |
Pablo Carpio, Rolando T. Candidato, Jr., Lech Pawlowski and Maria Dolores Salvador |
|
Publication date |
2018/10/31 |
|
Journal |
SURFACE AND COATINGS TECHNOLOGY |
| Volume |
Volume 371 |
| Pages |
11 |
| Publisher |
Elsevier |
| Abstract |
YSZ coatings were developed by solution precursor plasma spraying from different solution concentrations. The
solutions were characterized and correlated with the rheological properties (specific weight, viscosity and
surface tension). The mechanical injection was used therefore a correct injection is essential to get a correct
liquid jet break-up inside the plasma plume. The optimal injection pressure must be adjusted for each solution
since the solution characteristics affect on the injection process. It was experimentally found out by the observation
of the splats' morphology. The particles were not melted at low pressures but solidified prior to the
deposition when the injection pressure is high. It was also found out that the optimal static pressure varies with
the concentration, but the dynamic pressure is equal for every solution and slightly superior to the dynamic
pressure of the plasma plume. After injection optimization, coatings using different solution concentrations were
developed and their microstructures were investigated. The liquid jet fragmentations as well as the heat requirements
were modified with the concentration so that coating microstructure was affected. The resulting
coatings display a lamellar and porous microstructure with the presence of unmelted/unpyrolysed material.
Coatings' porosity increased while coatings' grow-up was less intensive when diluted solutions were used as
feedstock. |
| DOI |
|
Mindanao State
University - Iligan Institute of Technology