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首页> 外文期刊>Surface & Coatings Technology >Effect of oxygen content in NiCoCrAlY bondcoat on the lifetimes of EB-PVD and APS thermal barrier coatings
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Effect of oxygen content in NiCoCrAlY bondcoat on the lifetimes of EB-PVD and APS thermal barrier coatings

机译：NiCoCrAlY粘结涂层中的氧含量对EB-PVD和APS热障涂层寿命的影响

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摘要

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 0.2. wt% oxygen in the bondcoat. In the bondcoat with the high oxygen content the minor (0.3. wt.%) 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.
机译：研究了NiCoCrAlY粘结涂层中氧含量对EB-PVD和APS热障涂层（TBC）的循环氧化寿命的影响。 EB-PVD TBC系统的氧气含量为0.05 wt。 NiCoCrAlY粘结剂涂层中的％寿命是0.2的TBC系统的五倍。粘结涂层中的氧气重量百分比。在具有高氧含量的粘结涂层中，发现少量（0.3重量％）的钇被氧束缚成铝酸钇的细小沉淀。因此，钇对氧化铝垢附着的有益作用被显着降低。高氧粘结层的破坏时的临界氧化皮厚度比低氧粘结层的低约两倍。与EB-PVD TBC系统相反，没有观察到增加氧气含量对APS-TBC系统寿命的有害影响。这可以用APS-TBC系统的不同失效机理来解释，其中寿命主要取决于裂纹通过陶瓷面漆的传播速率。

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