Effect of oxygen content in NiCoCrAlY bondcoat on the lifetimes of EB-PVD and APS thermal barrier coatings
Effect of oxygen content in NiCoCrAlY bondcoat on the lifetimes of EB-PVD and APS thermal barrier coatings
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DOI：
10.1016/j.surfcoat.2013.01.054
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发表时间：
2013-04
影响因子：
5.4
通讯作者：
P. Song;D. Naumenko;R. Vaßen;L. Singheiser;W. Quadakkers
中科院分区：
文献类型：
--
作者：
P. Song;D. Naumenko;R. Vaßen;L. Singheiser;W. Quadakkers
研究了 NiCoCrAlY 粘结层中氧含量对 EB-PVD 和 APS 热障涂层 (TBC) 循环氧化寿命的影响。氧含量为 0.05 wt.% 的 EB-PVD TBC 系统。与粘结层中氧含量为 0.2wt% 的 TBC 系统相比，NiCoCrAlY 粘结层中 % 的使用寿命延长了五倍。在具有高氧含量的粘合层中，发现少量（0.3wt.%）的钇添加物被氧束缚成铝酸钇的细小沉淀物。因此，钇对氧化铝垢粘附的有益效果显着降低。高氧粘合层失效时的临界氧化皮厚度比低氧粘合层低约两倍。与 EB-PVD TBC 系统相比，没有观察到增加氧含量对 APS-TBC 系统的寿命产生不利影响。这可以通过 APS-TBC 系统的不同失效机制来解释，其中寿命主要取决于陶瓷面漆的裂纹扩展速率。
The effect of oxygen content in NiCoCrAlY bondcoat on the cyclic oxidation lifetimes of EB-PVD and APS thermal barrier coatings (TBC) has been studied. The EB-PVD TBC system with an oxygen content of 0.05 wt. % in NiCoCrAlY bondcoat shows five times longer lifetimes compared to a TBC system with 0.2wt% oxygen in the bondcoat. In the bondcoat with the high oxygen content the minor (0.3wt.%) yttrium addition was found to be tied up by oxygen into fine precipitates of yttrium aluminates. Thereby the beneficial effect of yttrium onto the adherence of the alumina scale was significantly reduced. The critical scale thickness at failure was by about a factor of two lower for the high oxygen bondcoat than for the low oxygen bondcoat. In contrast to EB-PVD TBC systems, no detrimental effect of increasing oxygen content on the lifetime of APS-TBC systems was observed. This can be explained by a different failure mechanism of APS-TBC systems, whereby the lifetime is mainly determined by the rate of crack propagation through the ceramic topcoat.