摘要
润滑脂性能稳定性是制约航天机电伺服机构长期贮存可靠性的重要因素,其流变特性直接影响伺服机构传动特性,为此设计并开展高温度应力下的加速退化试验,考察皂基、非皂基和混合基等不同基础油体系的3款牌号润滑脂的流变特性,分析获得不同润滑脂随热老化时间和温度应力变化的流变特性变化规律。研究发现,随着热老化时间的延长,润滑脂的黏度并不是单一方向变化,另外,在所考察牌号的润滑脂中,混合润滑脂在高温度应力下的流变特性稳定性优于皂基润滑脂和非皂基润滑脂,对航天机电伺服系统长期贮存过程中润滑脂性能评估具有工程价值。
The stability of lubricating grease performances is a significant factor that restricts the long-term storage reliability of aerospace electro-mechanical servo actuators.The rheological properties of lubricating grease can directly affect the transition characteristics of servo actuators.Accelerated degradation test at high temperature stresses is designed and carried out.Three grades of lubricating grease with different base oil systems,including soap based,non-soap based and mixed lubricating grease are investigated for their theological properties.The rheological properties of different lubricating grease changed in thermal aging time and temperature stress are analyzed.It is found that the viscosity of lubrication dose not change unidirectionally with the increase of thermal aging time.In addition,the rheological properties of mixed lubricating grease at high temperature is better than that of soap based lubricating grease and non-soap based lubricating grease,which is valuable to evaluate the properties of lubricating grease during long-term storage of aerospace electromechanical servo system.
作者
何露漫
陶胜
郑会
崔佩娟
黄玉平
HE Luman;TAO Sheng;ZHENG Hui;CUI Peijuan;HUANG Yuping(Beijing Institute of Precision Mechatronics and Controls,Beijing,100076;Control Actuation Innovation Center,Beijing,100076;SINOPEC Research Institute of Petroleum Processing Co.,Ltd.,Beijing,100083)
关键词
润滑脂
基础油体系
热老化
长期贮存
流变特性
lubricating grease
base oil system
thermal aging
long-term storage
rheological properties
