Water vapor corrosion behavior and failure mechanism of air sprayed bi-layer Yb2Si2O7/SiC and tri-layer Yb2Si2O7/ (SiCw-Mullite)/SiC environmental barrier coating

Advanced Powder Materials Pub Date : 2023-01-01 DOI:10.1016/j.apmate.2022.100064

Pengju Chen , Peng Xiao , Zhuan Li , Yichen Wang , Xian Tang , Yang Li

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Abstract

To improve the corrosion resistance of C_f/SiC composites in a water vapor oxygen coupled environment, the bi-layer Yb₂Si₂O₇/SiC and tri-layer Yb₂Si₂O₇/(SiC_w-Mullite, SM)/SiC environment barrier coatings were designed and prepared on the surface of C_f/SiC composites by chemical vapor deposition and sol-gel method united with air spraying. Results show that the mass loss of bi-layer Yb₂Si₂O₇/SiC coating coated samples was 17.24 × 10⁻³ g cm⁻² after 200 h oxidation at 1673 K, and the average compression strength retention rate was only 79.44% due to the formation of wide penetrating cracks. Comparatively, SiC whiskers in SM middle coating can not only increase the crack propagation resistance of mullite middle coating, but also alleviate the difference of coefficient of thermal expansion between Yb₂Si₂O₇ outer coating and mullite middle coating. Therefore, the mass loss of tri-layer Yb₂Si₂O₇/SM/SiC coating coated samples was only 2.93 × 10⁻³ g cm⁻² after 200 h oxidation at 1673 K, and the average compression strength retention rate was up to 98.79%.

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空气喷涂双层Yb2Si2O7/SiC和三层Yb2Si2O7/ (sicw -莫来石)/SiC环境屏障涂层的水蒸气腐蚀行为及失效机理

为了提高Cf/SiC复合材料在水蒸气-氧耦合环境中的耐腐蚀性，采用化学气相沉积和溶胶-凝胶法结合空气喷涂的方法，在Cf/SiC材料表面设计并制备了双层Yb2Si2O7/SiC和三层Yb2Si2O7/（SiCw-Mullite，SM）/SiC环境阻挡涂层。结果表明，Yb2Si2O7/SiC双层涂层样品的质量损失为17.24×10−3g200后cm−2h在1673氧化K、由于形成了较宽的穿透裂纹，平均抗压强度保持率仅为79.44%。相比之下，SM中涂层中的SiC晶须不仅可以提高莫来石中涂层的抗裂性，还可以缓解Yb2Si2O7外涂层与莫来石中层热膨胀系数的差异。因此，三层Yb2Si2O7/SM/SiC涂层样品的质量损失仅为2.93×10−3g200后cm−2h在1673氧化K、平均抗压强度保持率高达98.79%。

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来源期刊

Advanced Powder Materials

CiteScore

33.30

自引率

0.00%

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