Advanced Processing of MCrAlY Coatings (AMPC)

MCrAlY 涂层先进加工 (AMPC)

• 批准号: 556145-2020
• 负责人: Moreau, Christian
• 金额: $ 10.93万
• 依托单位: Concordia University
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=706110
• 关键词: Advanced; Processing; MCrAlY; Coatings; AMPC

New generations of gas turbine engines are striving to increase their operating temperature to yield greater efficiency in the engine cycle. Consequently, improved thermal barrier coatings (TBCs) must be used to protect metallic components exposed to these high temperatures. These coatings consist of a thermally insulating ceramic layer deposited on a metal bond layer (bondcoat). The bondcoat has two essential roles: it increases the adhesion between the insulating ceramic layer and the parts to be protected while providing protection against oxidation occurring at high temperature. This project aims to develop an improved bondcoat layer to increase the performance and durability of TBCs while reducing the manufacturing costs. In this project, the HVAF deposition process will be used to optimize the structure and roughness of the bondcoat layers while optimizing their resistance to oxidation. The HVAF (High-Velocity Air-Fuel) process is a thermal spray process for metallic powders which enables efficient deposition of dense and weakly oxidized coatings without the need for expensive vacuum systems. One of the important challenges of the project is to establish whether it is possible to produce dense layers while sufficiently limiting the reaction of the powders in air to avoid the formation of detrimental phases in the deposits. The proposed research strategy is structured into three stages. The first combines computer fluid dynamics (CFD) modeling with improved diagnostic methods to optimize and control of the HVAF process. The second step deals with the ultrafine microstructure characterization of the deposited bondcoat layers using a complete set of advanced electron microscopy techniques. In a third step, the oxidation resistance and the durability of the deposited coatings are optimized by varying the deposition parameters of the HVAF process and the properties and composition of the starting metal powders. Optimized coatings have the potential to improve engine fuel efficiency, reduce greenhouse gas emissions, and reduce engine manufacturing and maintenance costs.

新一代燃气涡轮发动机正在努力提高其工作温度，以提高发动机循环的效率。因此，必须使用改进的热障涂层 (TBC) 来保护暴露在高温下的金属部件。这些涂层由沉积在金属粘合层（粘合层）上的隔热陶瓷层组成。粘合层有两个重要作用：它增加绝缘陶瓷层和要保护的部件之间的粘附力，同时提供防止高温氧化的保护。该项目旨在开发一种改进的粘合层，以提高热障涂层的性能和耐用性，同时降低制造成本。 在该项目中，HVAF 沉积工艺将用于优化粘合层的结构和粗糙度，同时优化其抗氧化性。 HVAF（高速空气燃料）工艺是一种金属粉末热喷涂工艺，无需昂贵的真空系统即可高效沉积致密且弱氧化的涂层。该项目的重要挑战之一是确定是否有可能产生致密层，同时充分限制粉末在空气中的反应，以避免在沉积物中形成有害相。拟议的研究策略分为三个阶段。第一个将计算机流体动力学 (CFD) 建模与改进的诊断方法相结合，以优化和控制 HVAF 过程。第二步使用一整套先进的电子显微镜技术对沉积的粘合层进行超细微观结构表征。第三步，通过改变 HVAF 工艺的沉积参数以及起始金属粉末的性能和成分来优化沉积涂层的抗氧化性和耐久性。 优化的涂层有可能提高发动机燃油效率，减少温室气体排放，并降低发动机制造和维护成本。