Friction Characteristics and Mechanisms of Two Lithium Greases in Elastohydrodynamic Lubrication
| Autor: | Yanshuang Wang, Baojie Wu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Materials science Bearing (mechanical) integumentary system 020209 energy Mechanical Engineering Base oil chemistry.chemical_element 02 engineering and technology law.invention Viscosity 020303 mechanical engineering & transports 0203 mechanical engineering Polyol chemistry Mechanics of Materials law Grease 0202 electrical engineering electronic engineering information engineering Lubrication General Materials Science Lithium Composite material Safety Risk Reliability and Quality Lithium soap |
| Zdroj: | Journal of Failure Analysis and Prevention. 20:1266-1273 |
| ISSN: | 1864-1245 1547-7029 |
| Popis: | Two types of lithium greases were fabricated by using PAO and polyol ester as two base oils. The friction tests for the lithium soap-based greases were performed under different operating conditions by mini-traction machine, and the data were compared and analysed. The results show that when the lithium-based soap thickens different types of base oils with the same viscosity, the greater the elastohydrodynamic friction coefficient of the base oil, the greater the elastohydrodynamic friction coefficient of the grease. In a low-speed bearing or contact pair, both base oil and thickener go through the contact zone to contribute to the friction of the grease. When the same lithium-based thickener thickens the different base oils, the greater the interactions between the base oil molecules, the greater the interactions between the base oil molecules and the thickener molecules, the wider the soap fibres, and the greater the friction coefficient of the grease. The friction coefficient of oil PAO–lithium-based soap grease is higher than that of its base oil PAO. The friction coefficient of oil polyol ester–lithium-based soap grease is less than that of its base oil polyol ester when the viscosities of the two base oils are 68 mm2/s. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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