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Thermally Sprayed Oxidation Protection Coatings for γ-TiAl Substrates

机译：γ-TiAl基底的热喷涂氧化保护涂层

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摘要

Due to excellent mechanical properties and low density compared to super alloys (e.g. Ni-based alloys) Titanium Aluminide is often used as base material in the aerospace industry. But the thermodynamic conditions within turbines limit the capabilities of the material. At the moment γ-TiAl is used for parts, which have to withstand temperatures up to 700℃. Above this temperature oxidation kinetics cause a thick oxide layer consisting of several oxides, which tend to fast chipping. Therefore the surface of the γ-TiAl is being destroyed and the material loses its excellent mechanical properties. To enable the use of this material at higher temperatures, the development of an oxidation protection coating is necessary. Several coating techniques e.g. EB-PVD were tried in the last years, but the oxidation behaviour of the γ-TiAl could not be significantly improved. Protective thermal spray coatings so far seem to be a promising technology in order to protect γ-TiAl components against oxidation. Therefore this technique was used within this work, which aims for the development of new oxidation protection coatings. A multilayer system was developed. The multilayer consists of a ceramic ZrO_2-7Y_2O_3 coating with a NiCoCrAlY top coat. In this case the ceramic coating avoids the diffusion of Ti or Al of the γ-TiAl into the MCrAlY coating or the other way around. The NiCoCrAlY coating improved the oxidation behaviour of the Titanium Aluminide by building a dense oxide layer on top of the multilayer. The paper will give an overview about the results of the oxidation tests with the new developed multilayer concept for protection of the γ-TiAl against oxidation.
机译：与超级合金（例如，镍基合金）相比，由于优异的机械性能和低密度，铝化钛常被用作航空航天工业的基础材料。但是涡轮机内的热力学条件限制了材料的性能。目前，γ-TiAl用于零件，必须承受最高700℃的温度。在此温度以上，氧化动力学会导致由几种氧化物组成的厚氧化物层，这些氧化物层会快速崩裂。因此，γ-TiAl的表面被破坏，材料失去了优异的机械性能。为了能够在更高的温度下使用该材料，必须开发抗氧化涂层。几种涂覆技术，例如近年来尝试了EB-PVD，但不能明显改善γ-TiAl的氧化行为。迄今为止，保护性热喷涂涂层似乎是一种有前途的技术，可以保护γ-TiAl组分免受氧化。因此，这项技术被用于这项工作中，其目的是开发新的抗氧化涂层。开发了多层系统。该多层由具有NiCoCrAlY面涂层的ZrO_2-7Y_2O_3陶瓷涂层组成。在这种情况下，陶瓷涂层避免了γ-TiAl的Ti或Al扩散到MCrAlY涂层中或以其他方式扩散。 NiCoCrAlY涂层通过在多层的顶部构建致密的氧化物层，改善了铝化钛的氧化性能。本文将概述使用新开发的多层概念保护γ-TiAl免受氧化的氧化测试结果。

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