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首页> 外文会议>International Federation for Heat Treatment and Surface Engineering Congress vol.2; 20041026-28; Shanghai(CN) >Influence of Heat Treatment on the Bond Coat Cyclic Oxidation Behaviour in an Air-plasma-sprayed Thermal Barrier Coating System
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Influence of Heat Treatment on the Bond Coat Cyclic Oxidation Behaviour in an Air-plasma-sprayed Thermal Barrier Coating System

机译：热处理对等离子喷涂热障涂层系统中键合涂层循环氧化行为的影响

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摘要

It is generally believed that a thermally grown oxide (TGO) layer of alumina provides enhanced protection to the metallic bond coat in thermal barrier coating (TBC) systems at elevated temperatures. However, in an air-plasma-sprayed (APS) TBC system with Co-32Ni-21Cr-8Al-0.5Y (wt%) bond coat, the TGO layer formed upon thermal exposure in air was predominantly chromia and spinels, which would not effectively protect the bond coat at above 1000℃. In addition, mixed oxides of chromia, spinel and nickel oxide formed heterogeneously between the ceramic coating and CoNiCrAlY bond coat, which would promote crack initiation and lead to premature TBC failure. A heat treatment in a low-pressure condition was applied to the as-sprayed TBC system, with the aim to produce an alumina layer as well as reduce the amount of detrimental oxides. The influence of this low-pressure oxidation treatment (LPOT) on the bond coat cyclic oxidation behaviour of the TBC system was also investigated.
机译：通常认为，氧化铝的热生长氧化物（TGO）层在高温下对热障涂层（TBC）系统中的金属粘结层提供增强的保护。但是，在具有Co-32Ni-21Cr-8Al-0.5Y（wt％）粘结涂层的空气等离子喷涂（APS）TBC系统中，在空气中热暴露后形成的TGO层主要为氧化铬和尖晶石，而不会在1000℃以上有效保护粘结层。另外，氧化铬，尖晶石和氧化镍的混合氧化物在陶瓷涂层和CoNiCrAlY粘结涂层之间不均匀地形成，这将促进裂纹萌生并导致过早的TBC失效。将低压条件下的热处理应用于喷涂后的TBC系统，目的是生产氧化铝层并减少有害氧化物的量。还研究了这种低压氧化处理（LPOT）对TBC系统胶层循环氧化行为的影响。

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