纳米二氧化硅做稠化剂时添加量对润滑脂流变学行为及摩擦学性能的影响

采用纳米二氧化硅做稠化剂制备了含纳米二氧化硅质量分数为12%、14%、16%、18%和20%的5种润滑脂，研究了添加量对润滑脂理化性能、低温流动性、流变学行为和摩擦学性能的影响规律. 研究结果表明：稠化剂纳米二氧化硅质量分数的增大可以改变润滑脂的触变性，提高体系的胶体安定性与结构强度，影响体系的黏温性能；当质量分数达到16%后，润滑脂的流变特性不再发生明显变化，此时体系的骨架结构达到稳定. 摩擦学测试结果表明：含不同纳米二氧化硅质量分数润滑脂的减摩性能差异表现出与试验温度的相关性，相同测试条件下当试验温度达到150 ℃时5种润滑脂的摩擦系数相差不大；低温流动性测试结果则表明润滑脂的低温流动压力受纳米二氧化硅质量分数的影响明显，温度越低体系流动压力越大，不同稠度等级的润滑脂之间流动压力的增大幅度基本一致.

Five types of lubricating greases with nanosilica mass fractions of 12%, 14%, 16%, 18% and 20% were prepared using nanosilica as the thickener. The effects of thickener addition amount on the physicochemical properties, low-temperature fluidity, rheological behavior and tribological performance of the lubricating greases were studied. The research results show that increasing the mass fraction of nanosilica thickener can alter the thixotropy of the lubricating greases, improve the colloidal stability and structural strength of the system, and affect the viscosity-temperature behavior of the system. When the mass fraction reaches 16%, the rheological properties of the lubricating grease no longer change significantly, and the skeleton structure of the system reaches a stable state at this point. The tribological test results indicate that the differences in anti-friction performance of the lubricating greases with different nanosilica mass fractions correlate with the test temperature; under the same test conditions, when the test temperature reaches 150 ℃, the friction coefficients of the five lubricating greases are relatively close. The low-temperature fluidity test results show that the low-temperature flow pressure of the lubricating greases is significantly affected by the nanosilica mass fraction: the lower the temperature, the higher the flow pressure of the system, and the increase in flow pressure among lubricating greases of different consistency grades is basically consistent.

搜集汇总

背景与挑战

背景概述

该数据集研究了纳米二氧化硅作为稠化剂时，不同添加量（12%-20%）对润滑脂性能的影响。研究发现，添加量增加能提升润滑脂的胶体安定性和结构强度，但超过16%后流变特性趋于稳定；摩擦学性能与温度相关，高温下摩擦系数差异减小，而低温流动压力随添加量和温度降低显著增大。