Detrimental effects of sand ingression in jet engine ceramic coatings captured with Raman-based 3D rendering
Detrimental effects of sand ingression in jet engine ceramic coatings captured with Raman-based 3D rendering
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DOI：
10.1016/j.jeurceramsoc.2020.09.050
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发表时间：
2021-02
影响因子：
5.7
通讯作者：
C. Barrett;Z. Stein;Johnathan Hernandez;R. Naraparaju;Uwe Schulz;Laurene Tetard;Seetha Raghavan
中科院分区：
文献类型：
--
作者：
C. Barrett;Z. Stein;Johnathan Hernandez;R. Naraparaju;Uwe Schulz;Laurene Tetard;Seetha Raghavan
熔融的钙、镁和硅酸铝(CMA)渗入到喷气发动机热障涂层(TBCs)中会导致硬度增加和破坏性的相失稳，最终导致热机械失效。使用三维共聚焦拉曼光谱，通过绘制标准EB-PVD 7YSZ TBC涂层的单斜相体积分数(MPVF)来确定热化学降解的程度。在微尺度分辨率下，mPVF被表征为深度和入渗时间的函数。结果表明，相不稳定沿柱子周长方向最为强烈，而柱芯保留了大部分原始相。最大的相失稳发生在相互作用的第一个小时内，之后平均最小mPVF为32%。在交互时间增加十倍后，该值增加到42%。这种能够定量和非破坏性地表征CMA渗透的热障涂层降解的能力将加速抗降解涂层的开发。
The infiltration of molten calcium, magnesium, and alumino-silicates (CMAS) into jet engine thermal barrier coatings (TBCs) causes an increased stiffness and a destructive phase destabilization eventually leading to thermomechanical failure. Using 3D confocal Raman spectroscopy, the extent of thermochemical degradation was identified by mapping the monoclinic phase volume fraction (mPVF) throughout a standard EB-PVD 7YSZ TBC coating. The mPVF is characterized as a function of depth and infiltration time with microscale resolution. Results show that phase destabilization was most intense along the column's perimeter whereas the core of the column retained most of its original phase. The greatest amount of phase destabilization occurs within the first hour of the interaction after which the average minimum mPVF is 32 %. This value increases to 42 % after a ten-fold increase in interaction time. This ability to quantitatively and non-destructively characterize degradation of CMAS infiltrated TBCs will accelerate development of degradation resistant coatings.