Guo Jinglun, Zeng Cheng, Wu Pengxi, Liu Guoqiang, Zhou Feng, Liu Weimin
Center of Advanced Lubrication and Seal Materials, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China.
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
ACS Appl Mater Interfaces. 2022 Nov 23;14(46):52566-52573. doi: 10.1021/acsami.2c17729. Epub 2022 Nov 10.
Low interlaminar shear stress, high mechanical strength, and tunable structure make TiCT MXene a burgeoning star as solid lubricants and lubricant additives. Although surface modification strategy can improve its compatibility with base oils, it will eventually settle due to gravity. Additionally, base oils are prone to leakage, creep, and volatilization, which limit their application. To address these issues, supramolecular gels with surface-modified TiCT were conceived. Apart from the lubrication effect, the high thermal conductivity of TiCT MXene accelerated the phase transition rate of supramolecular gels. The thermal-reversible and creep-resistant properties distinguish them from other conventional lubricants. The tribological tests showed that the 500 solvent neutral (SN) supramolecular gel with 0.10 wt % TiCT-octadecylphosphonic acid (TiCT-ODPA) reduced the coefficient of friction (COF) by 46.32% and wear volume by 81.18% compared with pure 500SN oil. Moreover, they also performed well in load-carrying capacity, temperature tolerance, and speed adaptability. This work puts forward a new approach to prepare MXene-based lubricants tailored for some severe lubrication conditions. These exceptional features enable their application in rolling bearings, some gears, and other low maintenance mechanisms.
层间剪切应力低、机械强度高且结构可调，使得TiCT MXene成为一种新兴的固体润滑剂和润滑剂添加剂。尽管表面改性策略可以提高其与基础油的相容性，但它最终会因重力作用而沉降。此外，基础油容易泄漏、蠕变和挥发，这限制了它们的应用。为了解决这些问题，人们构思了表面改性TiCT的超分子凝胶。除了润滑效果外，TiCT MXene的高导热性加速了超分子凝胶的相变速率。热可逆和抗蠕变特性使它们有别于其他传统润滑剂摩擦学测试表明，与纯500SN油相比，含有0.10 wt% TiCT-十八烷基膦酸（TiCT-ODPA）的500溶剂中性（SN）超分子凝胶使摩擦系数（COF）降低了46.32%，磨损体积降低了81.18%。此外，它们在承载能力、耐温性和速度适应性方面也表现出色。这项工作提出了一种制备适用于某些苛刻润滑条件的MXene基润滑剂的新方法。这些优异特性使其能够应用于滚动轴承、某些齿轮和其他低维护机构。
