A multivariate tribological evaluation of candidate materials, surface treatments and dry film lubricants is needed for design of moving mechanical components that function reliably in extreme conditions, including for long-duration space missions. In this study, linear reciprocating or unidirectional sliding friction data was collected using ball-on-flat tests. The balls were hardened 440C stainless steel (either uncoated or sputtered with MoS₂) and flat surfaces were 440C stainless steel, Nitronic 60 stainless steel or Ti6Al4V titanium alloy with various surface treatments and/or dry film lubricants. Surface treatments included anodizing, nitriding and electrical discharge machining. The dry film lubricants included Microseal 200-1, sputtered MoS₂ and a nano-composite coating i-Kote. The data contains applied normal load, measured friction force, calculated coefficient of friction, ball position, ambient temperature and relative humidity during testing. Tests were performed at different peak Hertzian contact pressure conditions ranging from 300 to 2000 MPa. Data is also available for flat surfaces that were vacuum baked at 150 °C after surface treatment and dry film coating as well as samples tested in inert gas (nitrogen) environment. This data can be used both to fundamentally understand the tribological properties of different material systems as well as to enable design of components for specific applications, conditions and duty cycles.

Graphical Abstract

中文翻译：

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航天应用的各种材料和表面处理的环境和氮气环境摩擦数据

为了设计在极端条件下（包括长时间太空飞行任务）能可靠运行的运动机械组件，需要对候选材料，表面处理和干膜润滑剂进行多方面的摩擦学评估。在这项研究中，使用平放球试验收集了线性往复或单向滑动摩擦数据。球是用440C不锈钢硬化（未涂覆或用MoS ₂溅射），平坦的表面是经过各种表面处理和/或干膜润滑剂的440C不锈钢，Nitronic 60不锈钢或Ti6Al4V钛合金。表面处理包括阳极氧化，氮化和放电加工。干膜润滑剂包括Microseal 200-1，溅射的MoS ₂以及纳米复合涂料i-Kote。数据包含施加的法向载荷，测得的摩擦力，计算出的摩擦系数，球位置，环境温度和测试期间的相对湿度。在300至2000 MPa的不同峰值Hertzian接触压力条件下进行测试。还提供了在表面处理和干膜涂布后在150°C真空烘烤的平面的数据，以及在惰性气体（氮气）环境中测试的样品。这些数据既可以用来从根本上理解不同材料系统的摩擦学特性，也可以用于针对特定应用，条件和工作周期设计组件。

图形概要