Preparation, Friction, and Wear Behaviors of Cerium-Doped Anatase Nanophases in Rapeseed Oil

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• 作者：Kecheng Gu ; Boshui Chen ; Xuemei Wang ; Jiu Wang ; Jianhua Fang ; Jiang Wu ; Xin Yang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：April 16, 2014
• 年：2014
• 卷：53
• 期：15
• 页码：6249-6254
• 全文大小：409K
• 年卷期：v.53,no.15(April 16, 2014)
• ISSN：1520-5045

文摘

Composite cerium-doped anatase nanophases with an average diameter of 20 nm were prepared via sol鈥揼el method followed by surface modification with stearic acid, abbreviated SA/Ce-TiO₂. The microstructure of materials was characterized by XRD, FTIR, and SEM. Furthermore, the antiwear and friction-reducing capacities of SA/Ce-TiO₂ as lubrication additives in rapeseed oil were evaluated on a four-ball tribotester. The chemical characteristics, elemental composition, and morphology of worn surfaces of steel balls were investigated by XPS and SEM. The results show that SA/Ce-TiO₂ could obviously improve the antiwear and friction-reducing capacities of rapeseed oil, especially for the nanophases doped with 2.0 and 3.0% cerium in molar ratio, respectively. The excellent tribological performance of SA/Ce-TiO₂ in rapeseed oil can be attributed to the formation of a complex boundary lubrication film mainly consisting of Fe₂O₃, TiO₂, and CeO₂ as well as the formation of an adsorption film of SA and base oil on the friction surfaces.