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采用静态热老化模拟润滑脂在轴承中的热老化过程,通过红外光谱特征波峰面积变化、扫描电镜和差热分析表征热老化后润滑脂微观结构,并采用流变测试仪考察热老化过程中润滑脂流变性能的变化.结果发现:随着老化时间延长,基础油分子碳链发生断裂,稠化剂浓度下降,产生含羰基类氧化产物,该类物质浓度逐渐增强;老化后的润滑脂晶体结构遭到严重破坏,皂纤维网状结构逐渐瓦解,润滑脂结构稳定性变差,剪切过后,结构恢复速率变慢;超过热老化288 h润滑脂热稳定临界点后,润滑脂老化反应加剧,易从润滑部位流失,润滑失效.
The thermal aging process of grease in the bearing was simulated by static heat aging. The peak area of infrared spectrum was characterized by scanning electron microscopy and differential thermal analysis. The microstructure of the grease was characterized by rheological tester. The rheological properties of the grease were studied.The results showed that as the aging time prolonged, the carbon chain of the base oil fractured and the concentration of the thickener decreased, resulting in carbonyl-containing oxidation products and the concentrations of these substances gradually increased. The aged grease crystals The structure was severely damaged, the fibrous structure of soap fiber gradually disintegrated, the stability of the grease structure became worse, and the rate of structural recovery became slower. After the heat aging critical point of the grease aged at 288 h, the grease aging reaction aggravated Easy to lose from the lubrication parts, lubrication failure.