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The effect of TBC morphology and aging on the erosion rate of EB-PVD TBCs

机译：TBC形态和老化对EB-PVD TBC腐蚀速率的影响

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Since thermal barrier coatings (TBCs) have been used in gas turbines most of the research conducted on them has involved the bond coat and the growth of the thermally grown oxide (TGO) as failure of the bond coat and the TGO were considered to be the primary causes of failure. Erosion of TBCs has been considered as a secondary problem and as such received less attention. Most of the initial work on the erosion of TBCs covered the effects of velocity and impact angle on the erosion rates of both plasma sprayed (PS) and electron beam physical vapour deposited (EB-PVD) TBCs and compared the differences between the two deposition systems. It must be noted that most of the tests were conducted on coatings in the as received condition. This paper aims at expanding the understanding of the erosion of EB-PVD TBCs by examining the effects of TBC morphology, column diameter, column inclination angle and the effects of aging and sintering on the erosion rates of EB-PVD TBCs. The paper also looks at how erosion rate changes as the coating is eroded through to the bond coat. The paper also looks at the mechanisms of foreign object damage of EB-PVD TBCs under a range of different impact conditions. The different damage mechanisms have been identified and related to the size and impact velocity of the impacting particles. The effect of temperature on the plasticity and hence the mechanisms are also discussed, while mapping is used to set the boundary limits for the different types of damage mechanisms that have been identified. It was found that at temperatures above 800℃ the coatings can accommodate a large degree of plastic deformation, while at room temperature there is a greater degree of cracking, for similar types of FOD impact. The 800℃ is not necessarily a limit, but the temperature at which the coatings were tested, and the limiting temperature could in fact be significantly lower. It was found that, all else being equal, erosion rate decreases with a decrease in the column diameter, while aging results in an increase in the erosion rate, dependent on the aging temperature and time. A decrease in the inclination angle of the columns with respect to the substrate increases the erosion rate, when the inclination angle is less than 60° the erosion rate increases catastrophically. These effects are all discussed and explained in terms of erosion mechanisms and mechanical properties in the paper.
机译：由于热障涂层（TBC）已用于燃气轮机中，因此对其进行的大多数研究都涉及粘结层和热生长氧化物（TGO）的生长，因为粘结层和TGO的失效被认为是最主要的原因。失败的主要原因。 TBC的侵蚀被认为是次要问题，因此受到的关注较少。关于TBC腐蚀的大部分初步工作涵盖了速度和冲击角对等离子喷涂（PS）和电子束物理气相沉积（EB-PVD）TBC腐蚀速率的影响，并比较了两种沉积系统之间的差异。必须注意的是，大多数测试都是在原样下对涂层进行的。本文旨在通过研究TBC形态，色谱柱直径，色谱柱倾角以及时效和烧结对EB-PVD TBCs腐蚀速率的影响，扩大对EB-PVD TBCs腐蚀的认识。本文还研究了腐蚀速率如何随着涂层被侵蚀直至粘结层而变化。本文还研究了在一系列不同的冲击条件下，EB-PVD TBCs异物损坏的机理。已经确定了不同的损坏机制，并且与撞击颗粒的大小和撞击速度有关。还讨论了温度对可塑性的影响以及由此对机理的影响，同时使用映射来为已确定的不同类型的破坏机理设置边界极限。结果发现，在800℃以上的温度下，涂层可以承受较大程度的塑性变形，而在室温下，对于类似类型的FOD冲击，涂层的开裂程度更大。 800℃不一定是极限，但是测试涂层的温度和极限温度实际上可能要低得多。已经发现，在所有其他条件相同的情况下，腐蚀速率随柱直径的减小而降低，而老化则取决于老化温度和时间而导致腐蚀速率的增加。柱相对于基板的倾斜角的减小增加了腐蚀速率，当倾斜角小于60°时，腐蚀速率急剧地增加。本文就腐蚀机理和机械性能进行了讨论和解释。

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