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首页> 外文OA文献 >Characterization of TBC systems with NiPtAl or NiCoCrAlYTa bond coatings after thermal cycling at 1100°C: a comparative study of failure mechanisms
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Characterization of TBC systems with NiPtAl or NiCoCrAlYTa bond coatings after thermal cycling at 1100°C: a comparative study of failure mechanisms

机译：1100°C热循环后用NiPtAl或NiCoCrAlYTa粘结涂层对TBC系统进行表征：失效机理的比较研究

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摘要

During service, TBC can suffer degradation by CMAS, FOD, erosion or spallation. Whereas the first three are due to foreign particles, the last one is related to thermal cycling. When subjected to high temperature exposures followed by rapid coolings under oxidizing conditions, audTBC system undergoes morphological changes and stress development. This will initiate cracks which propagate and finally lead to failure by spallation. Consequently, the aim of the present study is to understand better the mechanisms responsible for such spallation events. Two kinds of TBCudsystems with different bond coatings (NiCoCrAlYTa or Pt-modified nickel aluminide bond coatings) are thermally cycled. Subsequently, SEM investigations on TBC systems after spallation concentrate on failure path, defect, morphological and microstructural changes to propose way forudimproving TBC system lifetime.
机译：在使用期间，TBC可能会因CMAS，FOD，腐蚀或剥落而退化。前三个是由于异物引起的，最后一个与热循环有关。当经受高温暴露，然后在氧化条件下快速冷却时，a udTBC系统会发生形态变化和应力发展。这将引发裂纹扩展，并最终导致剥落破坏。因此，本研究的目的是更好地理解引起此类散裂事件的机制。对具有不同粘结涂层的两种TBC udsystem（NiCoCrAlYTa或Pt改性的铝化镍粘结涂层）进行热循环。随后，对散裂后的TBC系统进行SEM研究，着眼于失效路径，缺陷，形态和微观结构的变化，从而为延长TBC系统的寿命提出了建议。

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