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首頁> 外文期刊>Journal of Materials Science >Failure mechanisms of thermal barrier coatings on MCrAlY-type bondcoats associated with the formation of the thermally grown oxide
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Failure mechanisms of thermal barrier coatings on MCrAlY-type bondcoats associated with the formation of the thermally grown oxide

機譯：MCrAlY型粘結(jié)涂層上熱障涂層的失效機理與熱生長氧化物的形成有關(guān)

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摘要

The effect of the thermally grown oxide (TGO) formation on the lifetime of the thermal barrier coatings (TBC) with MCrAlY-bondcoats (BC) is reviewed. A number of factors affecting the TGO-formation and TBC-failure are discussed including the coating microstructure, geometrical (coating roughness and thickness) and processing parameters. Under given testing conditions for a specific EB-PVD-TBC-system forming a flat, uniform alumina TGO a critical TGO-thickness for TBC-failure can be defined. This TGO-morphology is, however, not necessarily optimum for obtaining long TBC-lifetime, which can be extended by formation of TGO’s with an uneven TGO/BC interface. In contrast, APS-TBC-systems are prone to formation of intrinsically inhomogeneous TGO-morphologies. This is attributed to non-uniform depletion of Y and Al underneath rough MCrAlY-surfaces as well as due to the commonly observed repeated-cracking/re-growth of the TGO during temperature cycling. The latter phenomenon depends on the exposure temperature and the mechanical properties of the APS-TBC. In both types of TBC-systems the TGO-formation and TBC-lifetime appear to be very sensitive to the manufacturing parameters, such as vacuum quality during bondcoat spraying and temperature regime of the bondcoat vacuum heat-treatment.
機譯：綜述了熱生長氧化物（TGO）的形成對帶有MCrAlY粘結(jié)涂層（BC）的隔熱涂層（TBC）壽命的影響。討論了影響TGO形成和TBC失效的許多因素，包括涂層的微觀結(jié)構(gòu)，幾何形狀（涂層的粗糙度和厚度）以及加工參數(shù)。在給定的測試條件下，對于形成平坦，均勻的氧化鋁TGO的特定EB-PVD-TBC系統(tǒng)，可以定義TBC失效的臨界TGO厚度。然而，這種TGO形態(tài)對于獲得較長的TBC壽命不一定是最佳的，這可以通過形成具有不均勻的TGO / BC界面的TGO來延長。相反，APS-TBC系統(tǒng)易于形成內(nèi)在不均一的TGO形態(tài)。這歸因于在粗糙的MCrAlY表面下Y和Al的不均勻消耗，以及歸因于在溫度循環(huán)過程中TGO的反復(fù)裂紋/重新生長。后一種現(xiàn)象取決于APS-TBC的暴露溫度和機械性能。在兩種類型的TBC系統(tǒng)中，TGO的形成和TBC的壽命似乎對制造參數(shù)非常敏感，例如粘結(jié)涂層噴涂過程中的真空質(zhì)量以及粘結(jié)涂層真空熱處理的溫度范圍。

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