表面修饰硼酸镁纳米微粒的制备及其在水中的润滑性能

Preparation and Lubricating Properties of Nanometer Magnesium Borate in Aqueous Solution

用化学沉淀法制备了油酸三乙醇胺修饰的硼酸镁纳米微粒，并用透射电子显微镜、X射线衍射仪和红外光谱仪等对微粒进行了表征；采用四球摩擦磨损试验机研究了其在水溶液中的润滑，用扫描电子显微镜观察了磨斑表面形貌，用x射线光电子能谱分析了磨斑表面的化学成分。结果表明：所制备的硼酸镁纳米微粒粒径为40-60nm，并且表面修饰剂与纳米微粒发生了化学反应；纳米微粒在摩擦副表面形成了一层润滑膜；在摩擦副表面检测出镁、硼、铁等的氧化物，这些氧化物保护膜起到良好的润滑作用。

Magnesium borate nanoparticles modified by oleic acid triethanolamine were successfully synthesized by direct deposition and was characterized by means of transmission electron microscopy, X ray diffraction and infrared spectroscopy respectively. The effect of nanometer magnesium borate used as additives in aqueous solution on the lubricating behavior was investigated using a four-ball tester. The nanometer magnesium borate. The worn surfaces of the steel ball were analyzed by scanning electron microscopy. It was found that the average size of magnesium borate nanoparticles was 40-60 nm, and the surface of magnesium borate nanoparticles reacted with surface modifier via chemical adsorption. The results indicated that a layer of lubricating membrane was formed between the surfaces of the friction pairs. XPS analysis of the wear scar showed that MgO, B2O3, FeO and Fe2O were formed on the rubbing surface which provided the aqueous solution with good lubricating properties.