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Fret Wear Mediation of NIRCam Filter Wheel Assembly

机译：NIRCam滤轮组件的微动磨损中介

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We will discuss a fret wear solution developed for the James Webb Space Telescope NIRCam filter wheel assembly by implementation of a hard coating. With mechanisms and structures designed for space flight application, titanium is often selected as the choice material of construction. Titanium offers a low-density high strength material that is good for use with many optical instruments due to its' favorable thermal properties. An important factor to consider with titanium mechanisms and structures are component fits and the vibration environment that must be survived during launch. In many instances, small (slip) fits between titanium components can cause fret wear during launch induced vibration. Titanium is particularly susceptible to fret wear, although other materials also demonstrate the fret wear. Fretting is adhesive failure of a material that experiences impact and micro-slip with an adjacent part. The mechanism of fret wear involves small particles that are pulled from the surface of parts that turn into hard oxides that further accelerate the wear between the parts. To mitigate fret wear, the mechanism or structure can be designed to eliminate all slip fits altogether, lubricants may be added to the wear surfaces or hard coatings can be applied to the wear surfaces when the other approaches are not feasible. For the NIRCam filter wheel assembly, which must operate at 35K and remain optically clean, only hard coatings are feasible. A discussion of several coating alternatives and associated wear testing will be presented along with the selection of an optimal solution.
机译：我们将讨论通过实施硬涂层为James Webb太空望远镜NIRCam滤光轮组件开发的玻璃磨损解决方案。凭借设计用于太空飞行的机械装置和结构，钛通常被选作结构的首选材料。钛提供了一种低密度高强度材料，由于其良好的热性能而非常适合与许多光学仪器一起使用。钛机制和结构要考虑的重要因素是部件配合和发射期间必须生存的振动环境。在许多情况下，钛部件之间的小（滑）配合会在发射引起的振动过程中导致飞丝磨损。钛特别容易产生品格磨损，尽管其他材料也显示品格磨损。微动是指与相邻零件发生碰撞和微滑的材料的粘合失败。品格磨损的机制涉及从零件表面拉出的小颗粒，这些颗粒变成硬质氧化物，从而进一步加速零件之间的磨损。为了减轻细线磨损，可以设计机构或结构以完全消除所有滑动配合，当其他方法不可行时，可以将润滑剂添加到磨损表面上，或者可以将硬涂层施加到磨损表面上。对于必须在35K下运行且保持光学清洁的NIRCam滤光轮组件，仅硬涂层是可行的。将讨论几种涂层替代品以及相关的磨损测试，以及最佳解决方案的选择。

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