Macroscale superdurable superlubricity achieved in lubricant oil via operando tribochemical formation of fullerene-like carbon
Macroscale superdurable superlubricity achieved in lubricant oil via operando tribochemical formation of fullerene-like carbon
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DOI：
10.1016/j.xcrp.2022.101130
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发表时间：
2022-11
影响因子：
8.9
通讯作者：
J. Pan;X. Gao;Chang Liu;Kan Zhang;W. Zheng;Changfeng Chen
中科院分区：
文献类型：
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作者：
J. Pan;X. Gao;Chang Liu;Kan Zhang;W. Zheng;Changfeng Chen
摩擦和磨损在移动的机械组件中普遍存在，导致能量和设备损失并产生有害排放物。长期以来，缓解工作一直依赖于油基润滑剂，但在实现同时超低摩擦和磨损而不使用油添加剂方面仍然存在挑战。在这里，我们证明了双相TiB 2-MoS 2薄膜在不含添加剂的油润滑下表现出超持久的超润滑性，其特征在于在前所未有的长滑动距离内保持润滑剂中的极小摩擦系数（0.007）和超低磨损率（10− 9mm 3 N − 1 m −1），而不会降低性能。我们确定了一种摩擦化学途径，用于由TiB 2-MoS 2膜催化活化的油分子的分解，导致操作形成富勒烯样碳，从而减少摩擦。第一性原理计算揭示了TiB 2结构框架在磨损应变下的强应力响应，为超低磨损率提供了见解。这些发现展示了一种有前途的战略，以开发高性能的超润滑材料，满足苛刻的应用条件。
Friction and wear are ubiquitous in moving mechanical assemblies, causing energy and equipment loss and producing harmful emissions. Mitigation efforts have long relied on oil-based lubricants, but challenges remain in achieving concurrent ultralow friction and wear without oil additives. Here, we demonstrate that a dual-phase TiB2-MoS2film lubricated by oil without additives exhibits superdurable superlubricity characterized by a vanishingly small friction coefficient (0.007) and ultralow wear rate (10−9mm3N−1m−1) maintained in lubricants over an unprecedentedly long sliding distance without performance deterioration. We identify a tribochemical route for the decomposition of oil molecules catalytically activated by the TiB2-MoS2film, leading to operando formation of fullerene-like carbon that leads to diminished friction. First-principles calculations unveil strong stress responses of a TiB2structural framework under wear strains, offering insights into the ultralow wear rate. These findings showcase a promising strategy to develop high-performance superlubricating materials that meet stringent conditions for demanding applications.