Erosion behavior of EB-PVD 7YSZ coatings under corrosion/erosion regime: Effect of TBC microstructure and the CMAS chemistry
Erosion behavior of EB-PVD 7YSZ coatings under corrosion/erosion regime: Effect of TBC microstructure and the CMAS chemistry
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DOI：
10.1016/j.jeurceramsoc.2018.06.039
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发表时间：
2018-12
影响因子：
5.7
通讯作者：
L. Steinberg;R. Naraparaju;M. Heckert;C. Mikulla;U. Schulz;C. Leyens
中科院分区：
文献类型：
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作者：
L. Steinberg;R. Naraparaju;M. Heckert;C. Mikulla;U. Schulz;C. Leyens
在多尘环境中工作的航空发动机经常会遇到大量的粉尘/沙尘，这会对热障涂层造成严重的侵蚀问题。随着透平进口温度的升高，熔砂对热障涂层寿命的影响也越来越大。本文研究了热障涂层在冲刷和腐蚀联合作用下的行为。研究了TBC形态、CMAS浸渗时间和CMAS组成的变化及其对室温抗冲蚀性能的影响。在冲刷/腐蚀条件下，测试了两种不同的EB-PVD 7YSZ形貌，包括不同的气孔排列。与柱状“正常”结构相比，越“羽状”的结构具有更好的抗腐蚀性，这导致TBC的降解较少。然而，在CMAs入渗的影响下，这种作用被发现是相反的。总的来说，CMA渗入的EB-PVD热障涂层比未渗入的热障涂层具有更高的抗冲蚀性能。
Aero-engines operating in dust-laden environments often encounter a lot of dust/sand that causes a severe problem to the TBCs by means of erosion. As the turbine entry temperatures are rising, molten sand is also a big concern to the life-time of TBCs.This paper deals with the TBC behavior under the combined influence of erosion and corrosion attack. Variations in TBC morphology, CMAS infiltration time and CMAS composition and their influence on the erosion resistance at room temperature were investigated. Two different EB-PVD 7YSZ morphologies consisting of a different porosity arrangement were tested in the erosion/corrosion regime. The more ‘Feathery’ structure has a better resistance to erosion compared to a more columnar ‘Normal’ structure, which leads to less degradation of the TBC. However, under the influence of CMAS infiltration the effect was found to be reversed. In general, CMAS-infiltrated EB-PVD TBCs exhibit a higher erosion resistance than the non-infiltrated ones.