Characterizing Suspension Plasma Spray Coating Formation Dynamics through Curvature Measurements
| Autor: | Ramachandran Chidambaram Seshadri, Vaishak Viswanathan, Gopal Dwivedi, Sanjay Sampath |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Analytical chemistry 02 engineering and technology Temperature cycling engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Surfaces Coatings and Films Stress (mechanics) 020303 mechanical engineering & transports 0203 mechanical engineering Coating Plasma torch Materials Chemistry engineering Suspension plasma spray Particle Deposition (phase transition) Composite material 0210 nano-technology |
| Zdroj: | Journal of Thermal Spray Technology. 25:1666-1683 |
| ISSN: | 1544-1016 1059-9630 |
| DOI: | 10.1007/s11666-016-0460-2 |
| Popis: | Suspension plasma spraying (SPS) enables the production of variety of microstructures with unique mechanical and thermal properties. In SPS, a liquid carrier (ethanol/water) is used to transport the sub-micrometric feedstock into the plasma jet. Considering complex deposition dynamics of SPS technique, there is a need to better understand the relationships among spray conditions, ensuing particle behavior, deposition stress evolution and resultant properties. In this study, submicron yttria-stabilized zirconia particles suspended in ethanol were sprayed using a cascaded arc plasma torch. The stresses generated during the deposition of the layers (termed evolving stress) were monitored via the change in curvature of the substrate measured using an in situ measurement apparatus. Depending on the deposition conditions, coating microstructures ranged from feathery porous to dense/cracked deposits. The evolving stresses and modulus were correlated with the observed microstructures and visualized via process maps. Post-deposition bi-layer curvature measurement via low temperature thermal cycling was carried out to quantify the thermo-elastic response of different coatings. Lastly, preliminary data on furnace cycle durability of different coating microstructures were evaluated. This integrated study involving in situ diagnostics and ex situ characterization along with process maps provides a framework to describe coating formation mechanisms, process parametrics and microstructure description. |
| Databáze: | OpenAIRE |
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