Development of cold spray process for oxidation-resistant FeCrAl and Mo diffusion barrier coatings on optimized ZIRLO™
| Autor: | Jorie Walters, Benjamin Maier, Tyler Dabney, Greg Johnson, Kumar Sridharan, Hwasung Yeom |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Cladding (metalworking)
Propellant Nuclear and High Energy Physics Materials science Diffusion barrier Alloy Gas dynamic cold spray 02 engineering and technology Substrate (electronics) engineering.material 021001 nanoscience & nanotechnology 01 natural sciences 010305 fluids & plasmas Nuclear Energy and Engineering Coating 0103 physical sciences engineering General Materials Science Composite material 0210 nano-technology Eutectic system |
| Zdroj: | Journal of Nuclear Materials. 507:306-315 |
| ISSN: | 0022-3115 |
| DOI: | 10.1016/j.jnucmat.2018.05.014 |
| Popis: | The cold spray process has been investigated for the deposition of FeCrAl coatings on optimized ZIRLO™ fuel cladding tubes in order to enhance oxidation resistance at high temperatures (>1000 °C) that would be encountered in loss of coolant accident (LOCA) scenarios. The FeCrAl alloy provides excellent oxidation resistance, however Fe forms a eutectic with Zr at temperatures as low as 928 °C resulting in massive inter-diffusion and associated melting. Therefore, a Mo interlayer coating was developed also using the cold spray process to serve as a diffusion barrier between the Fe-based coating and the Zr-alloy substrate. To achieve a combination of desired properties for the dual-layered coating-substrate, an optimization study of spray parameters such as propellant gas pre-heat temperature, helical spray speed, and the number of spray passes was conducted. This parametric study was aimed at achieving dense coatings with desired thickness and coverage of the substrate, and good adhesion of the Mo interlayer coating with subsequent top FeCrAl coating and the Zr-alloy substrate. The optimal FeCrAl-Mo coating protected the Zr-alloy cladding tubes from oxidation at high temperatures of 1200 °C, while at the same time preventing diffusion-induced eutectic melting in the substrate. |
| Databáze: | OpenAIRE |
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