Repair of landing gear parts by Cold Spray additive manufacturing

飞机部件，如支架，是简单的次要结构，以及起落架，是主要的 结构，经常在正常操作期间或在机械加工过程中损坏 制造的。然而，目前这些飞机部件无法轻松或经济地进行维修，因为 缺乏维修航空航天产品和部件的认证技术。 我们建议使用冷气动力喷涂(CGDS)作为一种添加剂制造来开展这项研究 修复受损起落架部件的流程。CGDS通过以下方式生产金属层/涂层 在超音速下使用高速气体将金属粉末加速到待修复/涂层的部件上。 当与零件撞击时，金属颗粒塑性变形并产生结合良好的固体层；这具有 证明可以机械和/或冶金地将涂层与下表面结合。层/涂层 使用这种工艺可以生产各种金属制成的材料，而不会损坏要涂覆的部件。极小 热是在加工过程中产生的，因此，零件的温度保持在远低于其熔点的水平。 尽管CGDS已被成功地用于为各种基材生产各种涂层 十多年来，在世界范围内，主要由学术机构使用，它只在有限的情况下使用 航空航天部件的维修/恢复的次数和结果在文献中没有很好的记录。 此外，CGDS从未用于使用本文提出的材料修复部件。 因此，目前的Engage Grant申请中提出的方法是新颖的。我们提出了新的方法 其中使用建议的材料为航空航天工业开发经过认证的CGDS技术 对人类发展倡议的具体请求作出回应。

Aircraft parts such as brackets, which are simple secondary structures, and landing gears, which are primary structures, are often damaged during regular operations or during machining processes when the parts are manufactured. However, at present, these aircraft parts cannot be easily or economically repaired because of a lack of certified technologies for the repair of aerospace products and parts. We propose to carry out this research using Cold Gas Dynamic Spraying (CGDS) as an additive manufacturing process to restore and repair damaged landing gear parts. CGDS produces metallic layers/coatings by accelerating metal powders onto the part to be repaired/coated using high velocity gas at supersonic speeds. Upon impact with the part, metallic particles plastically deform and produce a well-bonded solid layer; this has proven to mechanically and/or metallurgically bond a coating with the underlying surfaces. Layers/coatings made of various metals can be produced using this process without damaging the parts to be coated. Minimal heat is produced during the process; thus, the temperature of the part remains well below its melting point. Although CGDS has been used successfully to produce a wide variety of coatings for a diversity of substrate types worldwide for more than a decade, mainly by academic institutions, it has only been used on limited occasions for repair/restoration of aerospace parts, and results are not well documented in the literature. Furthermore, CGDS has never been used to repair parts using the materials proposed herein. As such, the approach proposed in the current Engage Grant application is novel. We propose new ways in which to use the proposed materials to develop certified CGDS technology for the aerospace industry in response to a specific request by HDI.