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Effect of Surface Conditioning of Platinum Aluminide Bond Coats on Thermal Barrier Coating Life

机译：铝化铂键合涂层的表面处理对热障涂层寿命的影响

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摘要

Thermal Barrier Coatings (TBC) have been used for a number of years on components for use in aircraft gas turbine engines. The standard for processing these components includes grit blasting the bond coat prior to TBC deposition by Electron Beam Physical Vapor Deposition (EBPVD). While grit blasting has worked well for industry, it is argued that EBPVD TBC's are able to form strong bonds on smoother surface finishes. This would theoretically improve the component lifetime. This study involved the examination of the performance and failure of several industrially and economically viable alternative surface finishes as well as the effect of pre-oxidation treatments on the lifetime of the TBC. The system used consisted of a substrate of CMSX4 (Ni based superalloy), a platinum modified diffusional aluminide coating, and yttrium stabilized zirconia (YSZ) deposited by EBPVD as the TBC. Surface finishes applied prior to TBC deposition include 120 and 40 minute media finishes, barrel finish, and 3 mm hand polish. The various atmospheres were chosen for the pre-oxidation treatments in order to grow metastable and stable alumina scales. Exposure was done cyclically (1 hour cycles) at 1121oC in laboratory air until failure. Samples with the combination of media finish and mostly a alumina scales had lifetimes up to 1040 cycles. This is well beyond the expected value (~750 cycles) of a grit blasted sample in the same exposure conditions.
机译：热障涂层（TBC）已经在用于飞机燃气涡轮发动机的组件上使用了很多年。处理这些组件的标准包括在通过电子束物理气相沉积（EBPVD）进行TBC沉积之前，对粘合层进行喷砂处理。尽管喷砂处理在工业上运行良好，但据称EBPVD TBC能够在较光滑的表面光洁度上形成牢固的粘结。从理论上讲，这将延长组件的使用寿命。这项研究涉及对几种工业上和经济上可行的替代表面光洁剂的性能和失效以及预氧化处理对TBC寿命的影响的检查。所使用的系统由CMSX4（镍基高温合金）的基底，铂改性的扩散铝化物涂层以及由EBPVD沉积为TBC的钇稳定的氧化锆（YSZ）组成。在TBC沉积之前进行的表面处理包括120分钟和40分钟的介质表面处理，滚筒表面处理和3毫米的手工抛光。选择各种气氛进行预氧化处理，以生长亚稳态和稳定的氧化铝水垢。在1121oC的实验室空气中循环暴露（1小时周期），直到失效。结合了媒介光洁度和大多数氧化铝鳞片的样品的寿命可达1040个循环。这远远超过了在相同暴露条件下喷砂处理过的样品的预期值（约750个循环）。

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    Laney Scot Jason;

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  • 年度 2004
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