Development of oxidation and fretting-wear resistant coatings on Titanium Aluminide (TiAl) components

铝化钛 (TiAl) 部件抗氧化和微动磨损涂层的开发

• 批准号: 500663-2016
• 负责人: KlembergSapieha, Jolanta
• 金额: $ 11.66万
• 依托单位: École Polytechnique de Montréal
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=693909
• 关键词: Development; oxidation; fretting; wear; resistant

The thrust-to-weight ratio of a gas-turbine engine strongly depends on the performance of the materials involved. In order to achieve high engine efficiency, one can particularly benefit from the use of lightweight materials with high temperature resistance and high mechanical strength. In recent years, TiAl based alloys have been shown to exhibit considerable potential for high-temperature applications in aerospace due to their numerous attractive properties including low density, high specific strength, high elastic modulus and good creep resistance at high temperature. However, most of the applications involving TiAl alloys do not exceed 750°C due to mechanical and environmental limitations for this type of material. Above such high temperature non-protective mixture of Al2O3 and TiO2 is formed, leading to the Ti-alloy oxidation and deterioration. In response to the above limitations, the main objective of the proposed research is to develop coatings and surface treatments that would allow the use of intermetallic TiAl components at elevated temperatures (750-850°C). These coatings should simultaneously possess good oxidation and fretting-wear resistance, and they should not compromise the component fatigue characteristics. This research activity represents a possibility to strongly impact also other technological areas.

燃气轮机的推重比很大程度上取决于所用材料的性能。为了实现发动机的高效率，人们尤其可以受益于使用具有耐高温和高机械强度的轻质材料。 近年来，TiAl基合金因其低密度、高比强度、高弹性模量和良好的高温蠕变性能等众多吸引人的特性，在航空航天高温应用中表现出巨大的潜力。然而，由于此类材料的机械和环境限制，大多数涉及 TiAl 合金的应用温度不会超过 750°C。在这样的高温以上，形成Al2O3和TiO2的无保护性混合物，导致钛合金氧化和劣化。针对上述限制，本研究的主要目标是开发涂层和表面处理，允许在高温（750-850℃）下使用金属间化合物TiAl组件。这些涂层应同时具有良好的抗氧化性和抗微动磨损性，并且不应损害部件的疲劳特性。这项研究活动有可能对其他技术领域产生强烈影响。