Evolution of multilayered scale structures during high temperature oxidation of ZrSi2
| Autor: | Ben Maier, Hwasung Yeom, David Bai, Kumar Sridharan, Robert D. Mariani |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Spinodal Materials science Spinodal decomposition Mechanical Engineering Diffusion Nucleation Oxide 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Amorphous solid chemistry.chemical_compound Chemical engineering chemistry Mechanics of Materials Phase (matter) 0103 physical sciences General Materials Science 0210 nano-technology Phase diagram |
| Zdroj: | Journal of Materials Research. 31:3409-3419 |
| ISSN: | 2044-5326 0884-2914 |
| Popis: | The oxidation behavior of bulk ZrSi2 at 700, 1000, and 1200 °C in ambient air has been investigated. Parabolic to cubic oxide layer growth kinetics was confirmed by weight gain measurements and the average oxide layer thickness was 470 nm, 6.7 µm, and 37 µm at 700 °C, 1000 °C, and 1200 °C, respectively, after 5 h oxidation tests. Evolution of compositionally modulated nano/micro structures was confirmed in the oxide layer. At 700 °C, Si diffusion resulted in discontinuous Si-rich oxide phases in amorphous Zr–Si–O matrix. At 1000 °C, complex multilayered structures such as fine and coarse irregular spinodal structures, wavy Si-rich oxide, and Si-rich islands evolved. At 1200 °C, additional nucleation of nanoscale ZrO2 particulate phase was observed. The spinodal structures were confirmed to be crystalline ZrO2 and amorphous SiO2, and the thermodynamic driving force for phase evolution has been explained by extension of liquid miscibility gap in the binary ZrO2–SiO2 phase diagram. |
| Databáze: | OpenAIRE |
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