Growth kinetics and isothermal oxidation behavior of a Si pack cementation-coated Mo-Si-B alloy
| Autor: | Kyeong-Ho Baik, Seong Lee, Sangyeob Lee, Joon Sik Park, Kwangsu Choi, Youngmoo Kim, Wonchul Yang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Alloy General Physics and Astronomy 02 engineering and technology Surfaces and Interfaces General Chemistry Activation energy engineering.material Atmospheric temperature range 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Isothermal process 0104 chemical sciences Surfaces Coatings and Films Coating Chemical engineering Cementation (metallurgy) engineering Growth rate 0210 nano-technology Powder mixture |
| Zdroj: | Applied Surface Science. 489:668-676 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2019.06.020 |
| Popis: | In this study, coating-layer growth kinetics were determined to understand coating-layer growth behavior of Si pack cementation coatings on Mo-3Si-1B (wt%) alloys. When a pack powder mixture composed of Al2O3, Si and NaF was loaded in an alumina crucible with a substrate, a MoSi2 outer layer formed with a MoB phase between the outer layer and substrate. The average growth constant coefficient (k0) was estimated to be ~1899 μm/h1/2, and the activation energy for the growth rate of the coated layer thickness was estimated to be ~ 80 kJ/mol in the examined coating temperature range. The experimental results well matched the proposed equation for the growth kinetics of the coated layer on Mo-3Si-1B alloys. The oxidation behavior of the coating layer was also discussed in terms of the structural analysis. |
| Databáze: | OpenAIRE |
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