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.

重型部件通常镀有硬Chrome层，称为电解硬Chrome，以提高部件性能。从健康和环境的角度来看，通过使用六价铬Chrome生产这种镀层是不安全的，并且不断增加的监管要求推动了替代工艺和合金的发展。另一种选择是通过高速氧燃料（HVOF）热喷涂施加碳化钨涂层。它们已经越来越多地取代起落架、直升机动力部件、螺旋桨毂和液压致动器上的电解硬Chrome镀层。这些喷涂涂层往往提供比电解硬Chrome电镀上级的磨损、腐蚀和疲劳性能，从而为涂层涂覆器和航空航天制造商带来直接的成本效益。然而，该技术不能容易地转化为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。该提案和合作伙伴关系的目的是提高内径（ID）HVOF碳化物涂层的技术成熟度。作为一个更广泛的倡议的一部分，目前的目标是定义ID-HVOF的处理域作为所需的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/基体组件的疲劳行为和在服务行为。将使用数据分析工具来提高程序的稳健性。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在役性能的方法，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，包括材料供应商，设备供应商，涂料喷涂商和原始设备制造商的整个价值链，以生产更高性能的组件，减少制造业务对环境的影响，并成为具有全球影响力的逐步变革技术的一部分。