Abstract: Superlubricity, which describes the state of vanishing friction, was first proposed by Prof. Hirano in 1990. However, not until 2004, nanoscale superlubricity under high vacuum condition was observed in laboratory for the first time. Thereafter, superlubricity quickly became a new research hotspot all over the world, with graphene and other two-dimensional materials being the most intensively studied candidates, due to their unique structures and promising tribological properties. However, the overwhelming majority of superlubricating cases are limited to nano- and microscale, despite of several cases in the range of sub-millimeter scale, and centimeter-long double-walled carbon tube exhibited superlubricity between inner and outer walls. The primary causes are: (i) the tribological behaviour between micro- and macroscales varies significantly, because what happen between the two sliding surfaces (or interfaces) are extremely complicated, i.e. the simultaneously ongoing physical, chemical and mechanical interactions and reactions, with no universal tribological mechanisms or simulation models available; (ii) macroscale components could not meet the requirements of atomically clean and smooth surfaces which are essential for most superlubricity cases observed so far. Therefore, studies on superlubricity are primarily based on two-dimensional materials and limited to strictly-controlled laboratory conditions. In 2012, researchers from Tsinghua University observed self-retraction phenomenon in highly oriented pyrolytic graphite, pushing the superlubricating region from nanoscale to microscale. Recently, Lanzhou Institute of Physics made an important breakthrough on the fabrication and application of macroscale superlubricating solid films. A solid superlubricating film with desired properties-large scale, long service life and steady superlubricity, was prepared using reactive magnetron sputtering and applied to the moving parts of a small technology-verification satellite-BP-1B (launched on the 25th July, 2019). The a-C∶H based solid film exhibited satisfying in-space superlubricating performance, bringing this cutting-edge technology (superlubricity) into space for the first time in the world, which sets a landmark in the field of applicable superlubricity technology. This review starts from briefing the recent progresses on superlubricating materials. Then, several typical superlubricating phenomena and the related mechanisms were summarised and described, which in details are introducing nano-scrolling, liquid superlubricity, structural superlubricity, pressure-induced friction collapse, weak interlayer interaction, electrostatic repulsion, normal force or contact modulation and quantum tunneling. Finally, some prospects in the research directions and possible applications of superlubricity technology were made.
作者简介: 刘兴光,博士,毕业于英国谢菲尔德大学材料科学与工程系,导师为英国皇家工程院院士Allan Matthews教授和Adrian Leyland博士。2017年12月入中国航天科技集团公司五院第五一〇所研究所工作。从硕士阶段就开始从事表面工程技术研究工作,至今已有超过12年的相关领域的研究经验。对激光表面改性、物理气相沉积(以磁控溅射为主)的真空镀膜技术有多年的经验,对固体润滑薄膜结构设计、制备和显微表征分析有超过6年的研究基础,对XRD、AFM、FIB/SEM、SEM/EDX、HRTEM、STEM、EELS、EFTEM等多种材料分析表征手段及相关仪器的使用和操作拥有丰富的经验。与同事一起组织、主办了全英摩擦学会议TriboUK 2014。参加了ICMCTF(两次)、TriboUK(三次)、EUROMAT2017、2nd Workshop on “Superlubricity at nano and mesoscales”等多个表面工程及材料科学领域的高水平国际会议。在Acta Materialia,Scientific Reports,Applied Surface Science,Surface and coatings Technology等材料科学及表面工程领域高水平代表性期刊上发表SCI一区、二区等论文9篇。 张凯锋,高级工程师,硕士研究生导师。2007年毕业于兰州大学,获理学博士学位,同年入航天五院510所工作。长期从事基于航天器应用的表面工程技术研究。近年来,承担各类研发项目11项,解决了一批制约我国航天器/武器发展的瓶颈问题,发表学术论文30余篇,他引400余次,申请国家发明专利11项,主导制定国家军用标准3项。
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