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, Philippe
• 金额: $ 4.04万
• 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: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=720557
• 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.

重型组件通常用坚硬的铬层（称为电解硬铬）镀以改善零件性能。从健康和环境的角度来看，通过使用六价镀铬产生这种电镀并不是安全的，而不断增长的监管要求推动了替代过程和合金的开发。一种替代方法是高速氧气燃料（HVOF）热喷涂施加的钨碳化合物涂层。他们越来越替换了在起落架，直升机动态组件，螺旋桨轮毂和液压执行器上的电解硬铬镀板。这些喷涂的涂料往往比电解硬镀铬镀层提供出色的磨损，腐蚀和疲劳性能，从而为涂料涂抹器和航空航天制造商带来直接成本收益。但是，该技术不能轻易地翻译成限制的内部表面，也不能容易到达复杂形状的区域，例如较小的内径。该提案和伙伴关系的目的是提高内直径（ID）HVOF碳化物涂料的技术成熟度。作为更广泛的计划的一部分，目前的目标是将ID-HVOF的处理域定义为所需的粉末原料和涂层特性的函数，预测其微观结构，表征和描述涂料/底物组件的疲劳行为和服务行为。数据分析工具将用于增加过程鲁棒性。该研究项目的潜在结果包括一种新的高增值涂料技术，可用于深度孔，难以到达表面，这是一种理解和预测此类零件的服务绩效的方法，以及一个过程控制策略符合行业4.0期望。该项目的结果将使加拿大公司受益，涵盖材料供应商，设备提供商，涂料施用者和原始设备制造商的整个价值链，以生产更高的性能组件，减少制造业运营的环境影响，并成为全球影响的逐步改变技术的一部分。