S114022 ZnDTP,MoDTC添加潤滑下におけるトライボフィルムの機械的性質の測定([S11402]機素潤滑設計部門第17回卒業研究コンテスト(2))

概要

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Friction properties under boundary lubrication are determined by surface characteristics. On sliding surfaces, tribofilms are produced by lubricant additives. It is essential to study mechanical properties of the tribofilms for revealing friction mechanisms or improving sliding properties. In this work, we researched mechanical properties of the tribofilms using micro-scratch tester and atomic force microscopy (AFM). The tribofilms were produced by cylinder on disk reciprocating sliding test lubricated by Poly Alpha Olefin (PAO) with Zinc Dialkyldithiophosphate (ZnDTP) or ZnDTP and Molybdenum Dialkyldithiocarbamate (MoDTC). Micro-scratch tester was able to apply load and measure friction force with an accuracy of millinewton. AFM was used for getting topographic images and nano-hardness of the tribofilms. Experiments suggested that a soft layer like polymers exists on the tribofilm from ZnDTP and MoDTC. Less than 6 mN in load the tribofilm with ZnDTP and MoDTC has a lower friction coefficient than that with only ZnDTP. However the tribofilm leads to the opposite result above 6 mN. AFM measurements showed the existence of soft and sticky substance to prevent hardness determination on the tribofilm.
一般社団法人日本機械学会の論文
2011-09-11