Interaction of yttrium disilicate environmental barrier coatings with calcium-magnesium-iron alumino-silicate melts
作者： David L. Poerschke , John H. Shaw , Nisha Verma , Frank W. Zok , Carlos G. Levi
DOI: 10.1016/J.ACTAMAT.2017.12.004
关键词:
摘要: Abstract Reactions between molten calcium-magnesium-iron alumino-silicate (CMFAS) deposits and yttrium disilicate (Y2Si2O7, YDS) based environmental barrier coatings (EBC) on SiC/SiC ceramic matrix composites (CMCs) were investigated at 1300 °C. The coating readily dissolves into the melt from which an apatite phase, nominally Ca2Y8(SiO4)6O2, precipitates. These reactions are sufficiently fast to consume majority of approximately 275 μm thick in 24 h. Liquid phase separation, producing essentially pure SiO2 second occurs near reaction front suggesting dissimilar rates CaO exchange with overlaying deposit. rise large bubbles through above appears disrupt layer distributes throughout residual Channel cracks found layers; after longer exposures, branch extend laterally Si bond coat underlying CMC. Complementary experiments performed monolithic YDS pellets yielded long-term recession similar those coatings, although some differences evident morphologies early stages. Thermodynamic calculations used understand evolving driving force for YDS-to-apatite conversion. agreement simulated experimentally observed behaviors suggests that such could be predict influence temperature deposit composition EBC degradation.
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