油酸改性石墨相氮化碳的制备、表征及摩擦学性能研究

Preparation,Characterization and Tribological Properties of Oleic Acid Modified Graphitic Phase Carbon Nitride

石墨相氮化碳(g-C_(3)N_(4))具有高比表面积、超低的层间剪切强度以及表面化学稳定性,在润滑领域具有巨大的应用潜力。本工作采用冷凝回流法制备了油酸表面改性石墨相氮化碳(g-C_(3)N_(4)/OA)纳米片,并利用FTIR、XRD、SEM、AFM、TGA、BET等手段对其结构、形貌进行表征,利用四球法考察了含有g-C_(3)N_(4)/OA的150BS再生基础油的摩擦学性能。结果表明,0.03%(质量分数,下同)g-C_(3)N_(4)/OA作为润滑油添加剂,可使基础油平均摩擦系数(AFC)和平均磨斑直径(AWSD)最低,与纯150BS再生基础油相比,分别降低了27.7%和9.2%。机理分析表明,在摩擦过程中层状结构诱导的自润滑展现出良好的润滑性能,在摩擦接触界面形成含有铁、氧、氮和碳元素的自修复油膜有效提高了基础油的减摩、抗磨性能。

Graphite phase carbon nitride(g-C_(3)N_(4))has great potential application in the lubrication field due to its high specific surface area,ultra-low interlaminar shear strength and surface chemical stability.In this work,oleic acid modified graphite phase carbon nitride(g-C_(3)N_(4)/OA)nano sheets were prepared by condensation reflux method.FTIR,XRD,SEM,AFM,TGA,BET was employed to characterize the structure and morphology of g-C_(3)N_(4)/OA.And the tribological properties of 150BS regenerated base oil containing g-C_(3)N_(4)/OA were investigated by four ball method.The results show that the average friction coefficient(AFC)and average wear scar diameter(AWSD)can be minimized when 0.03wt%g-C_(3)N_(4)/OA as lubricating oil additive was used.Compared with the pure 150BS regenerated base oil,AFC and AWSD were reduced by 27.7% and 9.2%,respectively.The mechanism analysis shows that the self-lubrication induced by layered structure shows good lubrication performance during the friction process.The self-repairing oil film containing iron,oxygen,nitrogen and carbon elements is formed at the friction contact interface,which effectively improves the antifriction and anti-wear performance of the lubricating oil.