机械

探讨了纳米g-C_3N₄水基润滑剂对钛合金TC4表面摩擦学性能的影响。首先，采用往复式摩擦磨损实验机，观察不同质量分数的纳米g-C_3N₄水基润滑剂对钛合金/钢摩擦体系的摩擦系数和磨损量的影响。结果表明，纳米g-C_3N₄的添加显著降低了摩擦系数和磨损量。在纳米g-C_3N₄质量分数为2.5%时，润滑剂的摩擦学性能达到最佳，此时的摩擦系数和磨损量分别较去离子条件下降42.5%和39.8%。进一步研究了温度对最优含量纳米g-C_3N₄水基润滑剂摩擦学性能的影响，发现纳米g-C_3N₄水基润滑剂的最佳润滑温度应不大于100℃。通过激光共聚焦显微镜和场发射扫描电镜对磨痕表面进行了微观形貌和磨损机理的分析，揭示了摩擦过程中纳米g-C_3N₄在金属表面形成物理吸附膜，可以有效减少直接接触，降低摩擦系数；其独特层状结构提供的润滑效应，通过层间滑动降低接触面间的摩擦。

This study investigates the influence of nano-g-C_3N₄ aqueous lubricant on the tribological performance of titanium alloy TC4 surfaces. Firstly, a reciprocating friction and wear tester is utilized to examine the effects of nano-g-C_3N₄ with varying mass fractions on the friction coefficient and wear rate of the titanium alloy/steel friction system. The results reveal that the addition of nano-g-C_3N₄ significantly reduces both the friction coefficient and wear rate. When the mass fraction of nano-g-C_3N₄ is 2.5%, the lubricant exhibits optimal tribological performance, with the friction coefficient and wear rate decreasing by 42.5% and 39.8%,respectively, compared to the deionized water condition. Subsequent investigations into the effects of temperature on the tribological performance of the nano-g-C_3N₄ aqueous lubricant at the optimal content reveal that the optimal lubrication temperature for the nano-g-C_3N₄ aqueous lubricant should not exceed 100 ℃.Microscopic morphology and wear mechanism analysis of the wear scar surfaces are conducted by using laser confocal microscopy and field emission scanning electron microscopy. This analysis indicates that nano-g-C_3N_4forms a physical adsorption film on the metal surface during the friction, effectively reducing direct contact and lowering the friction coefficient; its unique layered structure provides a lubricating effect, reducing the friction between contact surfaces through interlayer sliding.