Evolution of high vacuum tribological performance of lead-doped hydrogenated diamond-like carbon coatings after atomic oxygen and ultraviolet irradiation

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Tribology International Pub Date : 2024-10-28 DOI:10.1016/j.triboint.2024.110356

Jiadong Shi , Guozheng Ma , Guolu Li , Zhen Li , Haichao Zhao , Cuihong Han , Haidou Wang

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引用次数: 0

Abstract

Pb/H-DLC coatings with varying Pb content were deposited using a unbalanced magnetron sputtering system, and their tribological properties were tested in vacuum. For the two coatings exhibiting superior performance, the surface damage caused by space irradiation was investigated in ground-simulated space environments, including atomic oxygen (AO) erosion and ultraviolet (UV) irradiation. The irradiation damage and friction mechanisms were analyzed using surface/interface characterization techniques. The results reveal that the hydrogen content and the ratio of I_D/I_G in the Pb/H-DLC coatings initially decrease and then increase with increasing the Pb content. The Pb/H-DLC coatings show improved mechanical and vacuum tribological properties when the Pb content is 0 at% and 2.4 at%. The lowest average friction coefficient is 0.014, and the lowest wear rate is 3.8 × 10⁻⁸ mm³N⁻¹m⁻¹. AO erosion induces graphitization and oxidation on the Pb/H-DLC coating surfaces, and the tribological properties of coating are deteriorated, while Pb doping effectively mitigates damage to the coatings' surface properties caused by AO erosion. The reduction in friction coefficient of the Pb/H-DLC coatings after UV irradiation can be mainly attributed to the formation of a soft layer consisting of HO-CO groups on the surface due to irradiation.

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原子氧和紫外线辐照后掺铅氢化类金刚石碳涂层高真空摩擦学性能的演变

使用不平衡磁控溅射系统沉积了不同含铅量的铅/H-DLC 涂层，并在真空中测试了它们的摩擦学特性。对于表现优异的两种涂层，在地面模拟空间环境中研究了空间辐照造成的表面损伤，包括原子氧（AO）侵蚀和紫外线（UV）辐照。利用表面/界面表征技术分析了辐照损伤和摩擦机理。结果表明，随着铅含量的增加，Pb/H-DLC 涂层中的氢含量和 ID/IG 比率先降低后升高。当铅含量为 0 at% 和 2.4 at% 时，Pb/H-DLC 涂层显示出更好的机械和真空摩擦学性能。最低的平均摩擦系数为 0.014，最低的磨损率为 3.8 × 10-8 mm3N-1m-1。AO 侵蚀导致 Pb/H-DLC 涂层表面石墨化和氧化，涂层的摩擦学性能变差，而掺杂 Pb 则有效减轻了 AO 侵蚀对涂层表面性能的破坏。紫外线辐照后 Pb/H-DLC 涂层摩擦系数降低的主要原因是辐照在涂层表面形成了由 HO-CO 基团组成的软层。

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来源期刊

Tribology International 工程技术-工程：机械

CiteScore

10.10

自引率

16.10%

发文量

627

审稿时长

35 days

期刊介绍： Tribology is the science of rubbing surfaces and contributes to every facet of our everyday life, from live cell friction to engine lubrication and seismology. As such tribology is truly multidisciplinary and this extraordinary breadth of scientific interest is reflected in the scope of Tribology International. Tribology International seeks to publish original research papers of the highest scientific quality to provide an archival resource for scientists from all backgrounds. Written contributions are invited reporting experimental and modelling studies both in established areas of tribology and emerging fields. Scientific topics include the physics or chemistry of tribo-surfaces, bio-tribology, surface engineering and materials, contact mechanics, nano-tribology, lubricants and hydrodynamic lubrication.