Residual stress effects of CMAS infiltration in high temperature jet engine ceramic coatings captured non-destructively with confocal Raman-based 3D rendering
Residual stress effects of CMAS infiltration in high temperature jet engine ceramic coatings captured non-destructively with confocal Raman-based 3D rendering
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DOI：
10.1016/j.jeurceramsoc.2022.11.003
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发表时间：
2022-11
影响因子：
5.7
通讯作者：
Z. Stein;R. Naraparaju;U. Schulz;L. Tetard;S. Raghavan
中科院分区：
文献类型：
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作者：
Z. Stein;R. Naraparaju;U. Schulz;L. Tetard;S. Raghavan
钙镁铝硅酸盐（CMAS）被喷气发动机吸入，并在运行过程中渗透到高温陶瓷涂层中。这种渗透增加了涂层硬度并促进涂层相不稳定，从而促进微裂纹形成。通过EB-PVD 7 YSZ涂层内的残余应力与微尺度分辨率的共焦拉曼光谱随着时间的推移映射CMAS渗透的热机械效应。结果表明，影响残余应力的物理和化学成分之间的相互作用。物理机制影响残余应力后1h的渗透，诱导拉伸载荷高达100 MPa的四相ZrO 2的拉曼光谱带。化学机制赋予更大的影响后，10小时，诱导压缩载荷高达100 MPa。观察到约35%的单斜相体积分数作为化学机制超越物理机制影响残余应力的过渡点。这些结果非破坏性地阐明了CMAS渗透过程中涂层残余应力的变化，有助于维护过程中的涂层退化监测和实施CMAS缓解策略。
Calcium-magnesium-aluminosilicates (CMAS) are ingested by jet engines and infiltrate into high temperature ceramic coatings during operation. This infiltration increases coating stiffness and promotes coating phase destabilization, encouraging micro-crack formation. Thermomechanical effects from CMAS infiltration were mapped over time with confocal Raman spectroscopy through residual stresses within EB-PVD 7YSZ coatings with microscale resolution. The results show an interplay between physical and chemical components influencing the residual stress. Physical mechanisms influence residual stress more after 1h of infiltration, inducing tensile loading up to 100 MPa on tetragonal ZrO2Raman bands. Chemical mechanisms impart greater influence after 10h, inducing compressive loading up to 100 MPa. A monoclinic phase volume fraction of about 35% was observed as a transitional point for chemical mechanisms overtaking physical mechanisms in influencing residual stress. These results non-destructively elucidate changes within a coating’s residual stress during CMAS infiltration, aiding coating degradation monitoring during maintenance and towards implementing CMAS-mitigation strategies.