单分散纳米SiO_2的制备及其作为润滑油添加剂的摩擦学性能研究  

Preparation and Tribological Properties of Monodispersed Nano-SiO_2 Particles as Additive in Lubricating Oil

作　　者：霍玉秋[1] 闫玉涛[2] 刘晓霞[1] 丁津原[2] 翟玉春[3] 田彦文[3] 

机构地区：[1]东北大学理学院,辽宁沈阳110004 [2]东北大学机械工程与自动化学院,辽宁沈阳110004 [3]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《摩擦学学报》2005年第1期34-38,共5页Tribology

基　　金：辽宁省自然科学基金资助项目(9910300501).

摘　　要：以正硅酸乙酯为原料制备了单分散纳米SiO2并表征了其结构,利用四球摩擦磨损试验机测定了所制备的纳米SiO2作为500SN基础油添加剂的摩擦学性能.结果表明:所制备的SiO2为粒径60nm左右的球形微粒,其表面含有大量羟基,具有无定形晶体结构;纳米SiO2作为添加剂可以显著提高500SN基础油的承载能力和抗磨性能,当纳米SiO2的添加量为2.0%时,相应的pB值最高、磨斑直径最小、摩擦系数最低.Monodispersed SiO2 spherical particles were prepared by the hydrolysis of tetraethoxy silane (TEOS) in the presence of ammonia as a catalyst. The chemical and phase structures of the resulting SiO2 nano-particulates were characterized using a Fourier transformation infrared spectrometer, and their morphology was observed using a transmittance electron microscope. A four-ball friction and wear tester was performed to investigate the tribological properties of the nano-SiO2 particles as additive in 500SN base oil. The worn surfaces of the steel balls lubricated with different lubricant systems were observed using a scanning electron microscope, while the elemental compositions of the wear scars were determined by means of energy dispersive spectrometry. It was found that the target nano-SiO2 particles were spherical-shaped and had a diameter about 60 nm and amorphism structure. At the same time, many hydroxyls were exposed on the surfaces of the nano-SiO2 particles, which made it possible for them to adsorb and form lubricating and protective layer on the worn steel surface. This accounted for the effectiveness of the nano-SiO2 particles as the additive in improving the tribological properties of the base stock. Moreover, the 500SN oil doped with 2.0% nano-SiO2 particles showed the best tribological properties among the tested oil samples.

关 键 词：纳米SIO2 添加剂 500SN基础油 摩擦学性能 

分 类 号：TF123[冶金工程—粉末冶金] TH117.3[冶金工程—冶金物理化学]