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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.1; Jul 7-11, 2003; Leganes, Madrid, Spain >Multifunctional Coating Design for High-Temperature Materials
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Multifunctional Coating Design for High-Temperature Materials

机译：高温材料的多功能涂层设计

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摘要

This paper highlights our recent discoveries associated with improving the reliability and life of next-generation metallic and ceramic turbine components via re-thinking and re-designing the multifunctionality of a few coating systems. For SiC/SiC ceramic matrix composites, we found that a pre-delaminated ZrO_2 coating, prepared by chemical vapor deposition (CVD), could serve as an intrinsically oxidation resistant interphase while providing the weak interface behavior desired for the composites. Stress-rupture results show that the ZrO_2 coating, when its nucleation behavior is properly controlled, can provide outstanding composite performance at 950 and 1200℃. Our approach appears to provide a unique solution to the pesting problem associated with state-of-the-art SiC/SiC composites containing a BN fiber coating. For Ni-based superalloys, we developed a novel procedure to prepare a ～150 μm thick α-Al_2O_3 layer directly on the superalloy surface. Oxidation results show that such a layer has profound effects on the phase contents and morphological evolutions of thermally grown oxide (TGO) and significantly reduces the TGO growth rate. Implications of the oxidation results are discussed in the context of optimizing the multifunctionality (i.e., thermal insulation and oxidation resistance) of next-generation thermal barrier coatings.
机译：本文重点介绍了我们最近的发现，这些发现与通过重新思考和重新设计一些涂层系统的多功能性来提高下一代金属和陶瓷涡轮机组件的可靠性和使用寿命有关。对于SiC / SiC陶瓷基复合材料，我们发现通过化学气相沉积（CVD）制备的预分层ZrO_2涂层可以用作固有的抗氧化界面，同时提供复合材料所需的弱界面性能。应力断裂结果表明，适当控制ZrO_2涂层的形核行为，可以在950和1200℃下提供出色的复合性能。我们的方法似乎为与含有BN纤维涂层的最新SiC / SiC复合材料相关的有害问题提供了独特的解决方案。对于镍基高温合金，我们开发了一种新颖的方法，可以直接在高温合金表面上制备约150μm厚的α-Al_2O_3层。氧化结果表明，这种层对热生长氧化物（TGO）的相含量和形态演变具有深远的影响，并显着降低了TGO的生长速率。在优化下一代热障涂层的多功能性（即隔热和抗氧化性）的背景下讨论了氧化结果的含义。

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