Mixed phase ytterbium silicate environmental-barrier coating materials for improved calcium–magnesium–alumino-silicate resistance
作者： Rebekah I. Webster , Elizabeth J. Opila
DOI: 10.1557/JMR.2020.151
关键词:
摘要: Calcium–magnesium–alumino-silicate (CMAS) reaction and infiltration behavior were studied in phase pure mixed ytterbium silicate environmental-barrier coating (EBC) materials at 1300 °C. Phase Yb2Si2O7 (YbDS) was infiltrated by CMAS via grain boundaries/pores, resulting loss of its structural integrity. Yb2SiO5 (YbMS) reacted with to form either apatite (Ca2Yb8(SiO4)6O2) or YbDS, depending on the initial glass composition. Both reactions YbMS slowed kinetics considerably compared YbDS. Samples having a YbDS matrix controlled amounts dispersions also investigated as model for air plasma spray coatings. containing ≥20 vol% coarse showed dramatically improved samples fine dispersion displayed new mode attack which spread sample surfaces. The results this study suggest that EBC compositions microstructures may be tailored optimized resistance.
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