材料科学
摩擦学
表面粗糙度
扫描电子显微镜
基础油
碱金属
润滑
表面光洁度
复合材料
边界润滑
接触角
金属
化学工程
冶金
化学
有机化学
工程类
作者
Hasan Baş,Muhammet Ali Beşirbeyoğlu,Özen Onur
摘要
Abstract Nowadays, researches on the use of alkali metal salts as friction‐reducing and anti‐wear oil additives are continuing. In this study, the tribological effects of heavy metal containing MoS 2 and alkali metal salt CaF 2 additives on pure engine oil (20W50) were investigated using block‐on‐ring tester configured as surface contact geometry. The tests were performed at various contact loads, revolutions, and additive ratios. The crystal structure of the additives and their effects on surface quality and surface roughness analysed by x‐ray crystallography, scanning electron microscope and profilometry. Moreover, Energy dispersive spectrometry was used for element detection on worn surfaces. Results indicated that additives of MoS 2 and CaF 2 can reduce the friction, increase the capacity of load‐carrying and the wear resistance of surfaces. The additives improved the operation of the base oil in boundary lubrication zone by increasing the tribofilm forming effect. It was observed that the CaF 2 additive exhibited more stable friction behaviour, while the MoS 2 additive has better protective effects against scratches on the block surface.
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