Abstract
The objective of this work is to design environmental barrier coatings with new structure to improve the thermal shock and oxidation resistance. A novel tri-layer SiC nanowires+Si/Yb2Si2O7-Si/Yb2Si2O7 coating was designed and fabricated on the surface of C/SiC composites by chemical vapor reaction route and combination of the method of atmospheric plasma spraying. All coated samples were subjected to thermal shock test at 1300 ℃. Results indicated that the interfacial bond among the layers in the coating system and C/SiC composites was still intact without delamination crack. The Si in the Yb2Si2O7-Si layer consumed the oxygen diffused into coating and then reacted with Yb2SiO5 to form Yb2Si2O7, which could decrease the release of tensile stress caused by thermal mismatch. The study also investigates the Yb2Si2O7 formation in the Yb2SiO5-Si system, and finds that the Yb2Si2O7 formation was controlled by the diffusion of Yb3+ and Si4+ ions through the Yb2Si2O7 layer.
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