Abstract
Environmental barrier coatings (EBCs) are needed to protect SiC based ceramic matrix composites (CMCs) from steam attack in next generation aircraft engines. In this study, EBCs consisting of a dense Yb2Si2O7 top coat and a columnar structure silicon bond coat were deposited using a hybrid chemical-physical vapor deposition process. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the coating phase composition and microstructure. The as-deposited Yb-Si-O coating is highly amorphous, and it transformed to crystalline Yb2Si2O7 and Yb2SiO5 phases after 1300 °C heat treatment in air. The durability of Yb2Si2O7/Si EBC was evaluated in a steam cycling test in flowing 90% H2O (g) + 10% air at 1316 °C, and the EBC survived 1000 1-h steam cycles without failure, which demonstrated the excellent durability of the hybrid vapor deposited Yb2Si2O7/Si EBC.
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