稀土磷酸盐在熔融钙镁铝硅酸盐腐蚀下的断裂特性
Fracture Characteristics of Rare-earth Phosphate under Molten Calcium Magnesium Aluminosilicate Corrosion
AI总结：
本文通过介观模拟与实验研究了LuPO4稀土磷酸盐EBC在CMAS腐蚀下的断裂特性，发现其抗断裂性能可能优于Lu2SiO5，为EBC设计提供新见解。
摘要：
本文对LuPO4稀土磷酸盐环境障涂层（EBC）材料在熔融钙镁铝硅酸盐（CMAS）腐蚀下的断裂特性进行了定量研究。EBC对于保护燃气涡轮发动机热端部件中SiC基陶瓷基复合材料至关重要。近期研究已表明，稀土磷酸盐作为EBC材料在抗CMAS腐蚀方面优于第三代稀土硅酸盐。然而，EBC在服役期间受CMAS腐蚀后的断裂问题仍是一个重要关注点。本工作采用介观尺度模拟与实验相结合的方法研究LuPO4的断裂行为。模型利用从制备的EBC样品中获取的显微照片进行介观尺度断裂模拟。模拟结果与实验断裂韧性数据进行比较，并通过统计检验（p<0.01）进行验证。模拟结果与实验观察均表明，在相似的CMAS腐蚀条件下，LuPO4可能表现出比Lu2SiO5稀土硅酸盐更高的抗断裂性能，这为未来EBC的设计与开发提供了潜在见解。
英文摘要：
The fracture characteristics of LuPO4 rare-earth phosphate environmental barrier coating (EBC) material under molten calcium-magnesium aluminosilicate (CMAS) corrosion is quantified. EBCs are crucial for protecting SiC-based ceramic matrix composite components in the hot section of gas turbine engines. Recent research has highlighted the potential of rare-earth phosphates as better EBC materials than third-generation rare-earth silicates for CMAS corrosion resistance. However, the fracture of EBCs under CMAS corrosion during service remains a significant concern. This work investigates the fracture behavior of LuPO4 using mesoscale simulation and experiments. The model uses micrographs taken from fabricated EBC samples for mesoscale fracture simulations. The simulation results are compared with experimental fracture toughness data and validated using statistical tests (p<0.01). The simulation results and experimental observations demonstrate that LuPO4 may exhibit higher fracture resistance than Lu2SiO5 rare-earth silicate under similar CMAS corrosion conditions, offering potential insights for future EBC design and development.
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