Publication Date:
2019-07-13
Description:
Particulates, like sand and volcanic ash, threaten the development of robust environmental barrier coatings (EBCs) that protect next-generation silicon-based ceramic matrix composite (CMC) turbine engine components from harsh combustion environments during service. The siliceous particulates transform into molten glassy deposits of calcium-magnesium aluminosilicate (CMAS) when ingested by an aircraft engine operating at temperatures above 1200C. In this study, a sample of desert sand was melted into CMAS glass to evaluate high-temperature interactions between the sand glass and an advanced EBC material. Desert sand glass was added to the surface of hot-pressed EBC substrates, which were then heated in air at temperatures ranging from 1200C to 1500C. Scanning electron microscopy and X-ray energy-dispersive spectroscopy were used to evaluate microstructure and phase compositions of specimens and the CMASEBC interface after heat treatments.
Keywords:
Composite Materials; Chemistry and Materials (General)
Type:
GRC-E-DAA-TN23826
,
International Conference on Ceramic Materials and Components for Energy and Environmental Applications; Jun 14, 2015 - Jun 15, 2015; Vancouver, BC; Canada
Format:
application/pdf
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