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Study of the changes in the microstructures and properties of grease using ball milling to simulate a bearing shear zone on grease.
Ren, Jia; Cai, Haopeng; Zhao, Gaiqing; Xu, Zhuang; Wang, Xiaobo.
Afiliação
  • Ren J; State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, Gansu, People's Republic of China.
  • Cai H; University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China.
  • Zhao G; Zibo Innovation Center of High-End Synthetic Lubricating Materials, Zibo, 255000, Shandong, People's Republic of China.
  • Xu Z; State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, Gansu, People's Republic of China.
  • Wang X; Qingdao Center of Resource Chemistry and New Materials, Qingdao, 266100, Shandong, People's Republic of China.
Sci Rep ; 14(1): 9734, 2024 Apr 28.
Article em En | MEDLINE | ID: mdl-38679616
ABSTRACT
The effects of shear degradation on the microstructures and properties of grease were investigated using a planetary ball mill to simulate a bearing shear zone on grease. The microstructure, cone penetration, colloidal stability, rheological properties noise properties, water washout characteristics and low-temperature torque of lithium grease were characterized. The microstructure of the initial lithium grease is a three-dimensional network structure formed by the uniform fibers. The entanglement level is high. As the ball milling shear time increases, the network structure of lithium grease is destroyed and the fibers are sheared to become short. Eventually all of them become short fibers. The performance test of lithium grease reveal that the cone penetration increases, colloidal stability, structural strength, noise properties, water washout characteristics of lithium grease gradually decreased with the increase of ball milling shear time. Additionally, the low-temperature starting torque and running torque of the grease gradually decrease. This phenomenon occurs due to changes in the microstructure of lithium grease. The shear degradation of lithium grease was mainly divided into two stages the rapid stage was the destruction of the thickener network structure and the fibers being shortened by shearing. The slow stage was the process in which short fibers were sheared into shorter fibers.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article