Liquid lubricants can reduce the friction and wear of two relative moving surfaces. However, there are still great challenges to achieve anticreep and superlubricity of liquid lubricants at the same time. In this study, a novel semisolid lubricant (P₃₀SSA) was designed by fixing poly-α-olefins 30 (PAO30) base oil in a three-dimensional network structure constructed by subnanowires (SNW) and stearic acid (SA), avoiding the creep problem of base oil and achieving ultralow friction (0.006–0009) at steel/polytetrafluoroethylene (PTFE) interfaces in a short period (∼6 s). Compared with dry friction, the wear rate of the PTFE was reduced by 98%. Moreover, the friction coefficient remains below 0.01 after more than 150,000 cycles. The ultralow friction behavior is attributed to the increasing bearing ability caused by the three-dimensional network structure in P₃₀SSA, the reduced internal friction of P₃₀SSA generated by the shear thinning of the lubricant during the friction process, and the physisorption film formed on the surface of friction pairs. The P₃₀SSA solves the problem of liquid lubricant creeping and achieves ultralow friction on the surface of steel/PTFE. This work opens up a new direction for semisolid lubricants and provides a new idea for the study of the ultralow friction mechanism.

中文翻译：

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在钢/PTFE 界面处通过聚 α-烯烃-亚纳米线-硬脂酸为界的半固体润滑剂实现油基快速超低摩擦


液体润滑剂可以减少两个相对运动表面的摩擦和磨损。然而，要同时实现液体润滑剂的抗蠕变性和超润滑性，仍然存在很大的挑战。本研究通过将聚α-烯烃 30 （PAO30） 基础油固定在由亚纳米线 （SNW） 和硬脂酸 （SA） 构建的三维网络结构中，设计了一种新型半固体润滑剂 （P₃₀SSA），避免了基础油的蠕变问题，并在短时间内 （∼6 s） 在钢/聚四氟乙烯 （PTFE） 界面处实现了超低摩擦 （0.006–0009）。与干摩擦相比，PTFE 的磨损率降低了 98%。此外，摩擦系数在超过 150,000 次循环后仍保持在 0.01 以下。超低摩擦性能归因于 P₃₀SSA 中三维网络结构引起的承载能力增强，润滑剂在摩擦过程中剪切稀化产生的 P₃₀SSA 内耗降低，以及摩擦副表面形成的物理吸附膜。P₃₀SSA 解决了液体润滑剂蠕变的问题，并在钢/PTFE 表面实现了超低摩擦。这项工作为半固体润滑剂开辟了新的方向，为超低摩擦机理的研究提供了新思路。