MoS₂/a‐C:H multilayer film and MoS₂/a‐C:H composite film exhibit excellent tribological properties in vacuum, which can be used as the potential space lubricant. The radiation‐protective properties of these two films in atomic oxygen (AO) are evaluated. The influences of AO radiation on structure, morphology, and tribological properties of the films were investigated. The results show that AO radiation mainly causes oxidation and increases sp² C content in both of the films. Furthermore, the MoS₂ sublayer on the surface of the multilayer film is oxidized heavily, whereas both the MoS₂ and the a‐C:H matrix on the surface were oxidized in the composite film. As a result of this, the multilayer film exhibits high friction coefficient and short sliding lifetime in vacuum after AO radiation. Compared with that, the composite film exhibits lower friction and longer sliding time more than 3600 seconds in vacuum, which illustrates it has a good AO radiation protection. This indicates that MoS₂/a‐C:H composite film is more likely to be used as a potential space lubricant.

中文翻译：

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纳米复合膜的抗氧辐射性能由氢化非晶碳（a-C：H）和MoS2组成

MoS ₂ / a-C：H多层膜和MoS ₂ / a-C：H复合膜在真空中表现出出色的摩擦学性能，可用作潜在的空间润滑剂。评估了这两层膜在原子氧（AO）中的辐射防护性能。研究了AO辐射对薄膜结构，形貌和摩擦学性能的影响。结果表明，AO辐射主要引起氧化，并增加了两个膜中的sp ² C含量。此外，多层膜表面上的MoS ₂子层被严重氧化，而MoS ₂复合膜中的a-C：H基质被氧化。结果，该多层膜在AO辐射后在真空中表现出高摩擦系数和短的滑动寿命。与此相比，该复合膜在真空中表现出更低的摩擦力和更长的滑动时间（超过3600秒），这说明它具有良好的AO辐射防护能力。这表明MoS ₂ / a-C：H复合膜更可能用作潜在的空间润滑剂。