复合钛基润滑脂静态热老化性能的研究

采用静态热老化方法模拟复合钛基润滑脂分别在150℃、200℃连续和间断运转模式下的热老化过程，通过分析静态热老化后复合钛基润滑脂的理化性能和流变性能变化规律，结合复合钛基润滑脂内部特征结构的变化情况，研究了复合钛基润滑脂的静态热老化性能。结果发现：热老化温度对复合钛基润滑脂性能具有较大的影响，且持续热老化对性能的影响大于间歇式热老化模式；不同热老化温度对性能产生影响的机理存在差异，150 ℃热老化表现为复合钛基润滑脂皂纤维结构解缠的物理过程，其红外光谱与新鲜脂样的结果表现出较好的一致性，而200 ℃热老化的影响主要归结于稠化剂热氧化和钛皂纤维出现解缠和断裂等不良现象。

STUDY ON STATIC THERMAL AGING PROPERTIES OF TITANIUM COMPLEX GREASE

The static thermal aging method was used to simulate the thermal aging process of titanium complex grease in continuous and intermittent operation mode at 150℃ and 200℃, respectively. The physicochemical and rheological properties of titanium complex grease after aging were analyzed. Combined with the changes of internal characteristic structure, the static thermal aging performance of the grease was studied. The results showed that the aging temperature had a great influence on the properties of the grease and the effect of continuous thermal aging on the performance was greater than the intermittent mode. The mechanism of the influence of different aging temperatures on the properties was different. The thermal aging at 150℃ showed a physical process of unwinding the titanium complex grease soap fiber structure, and its infrared spectrum was in good consistency with the results of fresh grease samples. The aging at 200℃ was mainly attributed to the thermal oxidation of the thickener and the unwinding and fracture of the titanium soap fiber.