g-C_3N_4的制备及在PEG400中的摩擦学性能研究

Preparation and Tribological Performance in PEG400 of g-C_3N_4 Nanomaterial

以三聚氰胺为前驱体采用焙烧法制备二维纳米材料g-C_3N_4,用X射线衍射(XRD)对g-C_3N_4粉体样品进行物相分析,同时用扫描电子显微镜(SEM)分析g-C_3N_4表面形貌。采用四球摩擦磨损试验机考察g-C_3N_4作为聚乙二醇400(PEG400)添加剂对钢-钢摩擦副摩擦磨损性能的影响,并采用扫描电子显微镜及X射线光电子能谱仪分析试验后钢球磨损表面形貌、元素分布及典型元素的化学状态。结果表明,所制备的g-C_3N_4具有二维层状纳米结构,作为添加剂在PEG400中具有良好的减摩抗磨性能。SEM和XPS分析表明,在摩擦学过程中g-C_3N_4沉积在摩擦副表面形成了润滑保护膜,从而提高了PEG400的摩擦学性能。

Two-dimensional nanomaterial,g-C3N4 was chemically synthesized using the melamine.The morphologies and crystalline structures of the g-C3N4 powder were characterized by scan electron microscopy （SEM） and X-ray diffraction （XRD） .The tribological properties of the prepared g-C3N4 nanomaterial as an additive in PEG400 were evaluated with a four-ball tester.The morphology of steel ball worn surface, the distribution of elements and the chemical state of typical ele- ments were analyzed by SEM and XPS.The results show that the prepared g-C3N4 has two dimensional layered nanostruc- ture, it exhibits excellent friction reducing properties and good anti-wear ability in PEG400.SEM and XPS analysis indicate that physical adhesion film mainly composed of g-C3N4 and some adsorbed organic compounds is formed during the friction process.These contribute to the good friction reducing and anti-wear ability of g-C3N4 nanomaterial as PEG400 additive.