The interaction of calcium–magnesium–aluminosilicate with ytterbium silicate environmental barrier materials
| Autor: | Katherine T. Faber, F. Stolzenburg, Kang N. Lee, Nathan S. Jacobson, M. T. Johnson |
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| Rok vydání: | 2015 |
| Předmět: |
Ytterbium
Materials science Chemistry(all) Scanning electron microscope Energy-dispersive X-ray spectroscopy Mineralogy chemistry.chemical_element General Chemistry Surfaces and Interfaces Condensed Matter Physics Silicate Surfaces Coatings and Films Crystallography chemistry.chemical_compound Electron diffraction chemistry Aluminosilicate X-ray crystallography Materials Chemistry Spectroscopy |
| Zdroj: | Surface and Coatings Technology. 284:44-50 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2015.08.069 |
| Popis: | The interactions of two potential topcoat materials for environmental barrier coatings, Yb_2SiO_5 and Yb_2Si_2O_7, with calcium-magnesium-aluminosilicate (CMAS) engine deposits were studied. X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and electron diffraction were used to investigate the phase transformation associated with the exposure of Yb_2SiO_5 and Yb_2Si_2O_7 to CMAS at 1300 °C. It was found that Yb_2SiO_5 strongly reacts with CMAS to completely dissolve the Yb_2SiO_5 and form hexagonal Ca_2Yb_8(SiO_4)_6O_2 deposits. In contrast, no discernable reaction between CMAS and Yb_2Si_2O_7, was observed over the 96-h exposure. |
| Databáze: | OpenAIRE |
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