GAO Fei1*, XU Yi1, XU Binshi1, ZHANG Baosen1,2, ZHANG Bo1, SHI Peijing1
(1. Science and Technology on Remanufacturing Laboratory, Academy of Armored Forces Engineering, Beijing 100072, China 2. Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiaotong University, Shanghai 200240, China)
Abstract: A RFT-III reciprocating friction and wear tester (pin-on-block contact mode) was used to investigate the self-repairing performance of oleic acid-surface-capped natural serpentine powder as a lubricating oil additive for steel-steel frictional pair. The microhardness of worn block surface was measured using a hardness meter. The morphology, elemental composition, and chemical state of typical elements on worn steel surfaces and cross-sections were analyzed by means of scanning electron microscopy, energy dispersive spectrometry; and the self-repairing mechanism of the surface-capped natural serpentine powder was explored. Results indicate that the surface-capped natural serpentine powder as a lubricating oil additive can greatly reduce the friction coefficient and wear rate of the steel-steel pair, which was attributed to the formation of a self-repairing layer with good friction-reducing and antiwear performance on worn steel surface viatribochemical reaction in the presence of the lubricating oil additive. The self-repairing layer was composed of densely packed nanoparticles with various sizes. It contained a large amount of Fe2O3 and amorphous graphite as well as a small amount of Fe, organic fragments, Si-containing organic compounds, and SiO2.
Key words: natural serpentine; lubricating oil additive; self-repairing performance; self-repairing mechanism
E-mail: gfccp@hotmail.com
Tribology, Vol. 31, Issue 5, 2011, 431~438
