水溶性LaF3纳米颗粒的制备及其摩擦学行为研究

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以柠檬酸为修饰剂在水溶液中合成表面修饰LaR纳米微粒，通过X射线衍射（XRD）、傅立叶变换红外光谱（FTIR）、热重分析（TG―DTA）、激光粒度分布仪、透射电子显微镜（TEM）、X射线光电子能谱仪（XPS）等测试手段对其结构和形貌进行表征；采用四球摩擦磨损试验机考察LaF3纳米微粒作为添加剂时的摩擦学行为；采用X射线光电子能谱仪（XPS）分析钢球磨损表面的元素组成。结果表明，柠檬酸修饰的LaF3纳米微粒，平均粒径约为4nm；LaF3纳米微粒在水中的分散性良好，作为水基添加剂，在摩擦过程中可在钢摩擦副表面的形成由Fe2O3、La2O3，等为主要组成部分的边界润滑膜，因此表现出极好的抗磨减摩性能，具有很好的应用前景。 The water-soluble LaF3 nanoparticles modified by citric acid were synthesized. Their morphology and structure were characterized by X-ray diffraction （ XRD ）, Fourier transform infrared spectroscopy （ FTIR ）, thermal analysis （ TG- DTA）, laser granulometry, transmission electron microscope（ TEM ）, and X-ray photoelectron spectroscopy（ XPS ）. The tri- bological behaviors of water soluble LaF3 nanoparticles as additives in water were evaluated with a four-ball tribometer, and the elemental composition of the wear scar on steel ball surface was analyzed by X-ray photoelectron spectroscopy（XPS）. The results show that the LaF3 nanoparticles, with a diameter about 4 nm and modified by a citric acid, can be well dispers- ed in water. As the water-based lubricant additive, a boundary film mainly composed of Fe203 ,La203 on the rubbed surface could be formed. Therefore, LaF3 nanoparticles have the best friction reducing and antiwear behaviors, showing promising usage potential.