纳米氧化锌的表面修饰及其摩擦学行为研究

Study on Surface Modification of ZnO Nanoparticles and Their Tribological Behaviors

采用直接沉淀法制备了粒径分布均匀(平均大小约为10nm)的纳米氧化锌,并采用X射线衍射(XRD)和透射电子显微(TEM)手段进行了表征.以山梨糖醇酐三油酸酯(span-60)、油酸、月桂酸钠和氟碳((C—F)x)为表面活性剂对纳米氧化锌进行表面修饰,将修饰过的纳米氧化锌添加到液体石蜡中,使其质量分数为0.5%,进行沉降实验.用傅里叶红外线光谱仪(FT-IR)对表面修饰过的纳米氧化锌进行分析,用Falex-6型四球摩擦磨损实验机进行摩擦磨损实验,用扫描电子显微镜(SEM)对钢球的表面进行形貌分析.结果表明,在液体石蜡中加入修饰过的纳米氧化锌,其摩擦系数及钢球的磨损程度均大大降低,其中经含有羧基的油酸修饰的纳米氧化锌在液体石蜡中的分散性最好,抗磨减摩性能最佳.

ZnO nanoparticles with an average size of 10 nm were prepared by precipitation, which were characterized by X-ray diffraction（XRD） and transmission electron microscopy （TEM）. ZnO nanoparticles were surface-modified by surfactants such as span-60, oleic acid, sodium laurate, and （C-F）x as surfacemodifier, and were added at the concentration of 0. 5% in lquid paraffin to perform sedimentate test. Surface-modified ZnO nanoparticles were characterized by FT-IR, and behaviors of friction and wear were evaluated with Falex-6 model four-ball wear tester. After four-ball test, the morphology of the rubbing surface was evaluated with scanning electron microscope （SEM）. It was showed that surface-modified nanoparticles could greatly reduce friction coefficient and improve anti-wear ability, and oleic acid-modified contained carboxyl ZnO nanoparticles had a better dispersing ability, which also had excellent behavior of antiwear and friction coefficient reducing.