High performance protective coatings on the inner diameter of landing gear components for the replacement of hard chrome: assessment and predictive modeling of fatigue behavior

起落架部件内径上的高性能保护涂层用于替代硬铬：疲劳行为的评估和预测建模

• 批准号: 561531-2021
• 负责人: Bocher, PhilippeP
• 金额: $ 6.01万
• 依托单位: École de technologie supérieure
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=754276
• 关键词: performance; protective; coatings; inner; diameter

Heavy duty components are often plated with a hard layer of chrome, called electrolytic hard chrome, to improve the part performance. Producing such plating through the use of hexavalent chrome is not safe from a health and environmental point of view and the ever increasing regulatory requirements push the development of alternative process and alloys. An alternative is a tungsten-carbide coating applied by High Velocity Oxy-Fuel (HVOF) thermal spraying. They have increasingly replaced electrolytic hard chrome plating on landing gears, helicopter dynamic components, propeller hubs, and hydraulic actuators. Those sprayed coatings tend to provide superior wear, corrosion and fatigue performance than electrolytic hard chrome plating, yielding direct cost benefits for both the coating applicator and the aerospace manufacturer. However, the technology cannot be readily translated to confined internal surfaces or difficult to reach areas of complex shapes, such as the smaller internal diameters. The aim of this proposal and partnership is to advance the technological maturity of inner-diameter (ID) HVOF carbide coatings. As part of a wider initiative, the present objectives are to define the processing domain of ID-HVOF as a function of the required powder feedstocks and coating properties, predict their microstructure, characterize and describe the fatigue behaviour of the coating/substrate assemblies and in-service behaviour. Data-analytic tools will be used to increase the process robustness. The potential outcomes of this research project include a new high value-added coating technology for deep bore parts and difficult to reach surfaces, a methodology to understand and predict in-service performance for such parts and a process control strategy meeting Industry 4.0 expectations. The outcomes of this project will benefit Canadian companies encompassing the entire value chain of material suppliers, equipment providers, coating applicators and original equipment manufacturers in producing higher performing components, reducing the environmental impact of the manufacturing operations, and being part of a step-change technology of global impact.

重型部件通常镀有一层硬铬，称为电解硬铬，以提高零件性能。从健康和环境的角度来看，通过使用六价铬生产此类镀层并不安全，不断增加的监管要求推动了替代工艺和合金的开发。另一种选择是通过高速氧燃料 (HVOF) 热喷涂涂覆碳化钨涂层。它们越来越多地取代了起落架、直升机动力部件、螺旋桨轮毂和液压执行器上的电解硬铬镀层。这些喷涂涂层往往比电解硬铬电镀具有更优异的磨损、腐蚀和疲劳性能，为涂层施工者和航空航天制造商带来直接的成本效益。然而，该技术不能轻易地应用于受限的内表面或难以到达复杂形状的区域，例如较小的内径。该提案和合作的目的是提高内径 (ID) HVOF 碳化物涂层的技术成熟度。作为更广泛计划的一部分，目前的目标是将 ID-HVOF 的加工范围定义为所需粉末原料和涂层性能的函数，预测其微观结构，表征和描述涂层/基材组件的疲劳行为，并在-服务行为。数据分析工具将用于提高流程的稳健性。该研究项目的潜在成果包括用于深孔零件和难以到达表面的新型高附加值涂层技术、了解和预测此类零件的使用性能的方法以及满足工业 4.0 期望的过程控制策略。该项目的成果将使加拿大公司受益，涵盖材料供应商、设备提供商、涂层施工商和原始设备制造商的整个价值链，生产更高性能的部件，减少制造业务对环境的影响，并成为阶跃变革的一部分具有全球影响力的技术。