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Effect of grain boundary on the friction coefficient of pure Fe under the oil lubrication

Adachi, Nozomu*; Matsuo, Yasutaka*; Todaka, Yoshikazu*; Fujimoto, Mikiya*; Hino, Masahiro*; Mitsuhara, Masatoshi*; Oba, Yojiro ; Shiihara, Yoshinori*; Umeno, Yoshitaka*; Nishida, Minoru*

Recent theoretical researches revealed that grain boundary affects tribological properties through the change in adsorption properties of additives in lubricants. Therefore, the effects of the grain boundary on the tribological properties were investigated by friction test of pure iron films under oil lubrication. We found that a friction coefficient decreases with increasing the fraction of the grain boundary in the lubricants forming chemisorbed film on sample surface. This suggests that the grain boundary enhances the formation of the chemisorbed films and reduces the friction coefficients by protecting the sample surface.

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Category:Engineering, Mechanical

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